What is the work done by gravity on a 4 kg ball
a. as it goes from point B to point A?
b. As it goes from point A to C?
(horizontal distance between A and B is 8 m; between B and C is 3.2 m)

At 237.0 kPa and 327.0°C, an ideal gas law occupies 3.45 m3. Find the number of moles of the gas is 150.9 mol.

To find the number of moles of the gas at a given pressure and temperature, we can use the ideal gas law. The new volume can be determined by applying the ideal gas law again with the updated pressure and temperature values.

The ideal gas law equation is given by[tex]PV = nRT[/tex], where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

For the first part, we are given the pressure (237.0 kPa), temperature (327.0°C), and volume (3.45 m³). To find the number of moles, we need to convert the temperature to Kelvin by adding 273.15 to it. Then, we rearrange the ideal gas law equation to solve for n: [tex]n = PV / RT[/tex]. Plug in the values and calculate to find the number of moles.

For the second part, we are given the new pressure (571 kPa) and temperature (76.0°C). Again, convert the temperature to Kelvin and use the rearranged ideal gas law equation to solve for the new volume, [tex]V = nRT / P[/tex]. Substitute the values of n, R, T, and P to calculate the new volume.

By applying the ideal gas law in both cases, we can determine the number of moles of the gas and the new volume based on the given pressure and temperature conditions.

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Answer:

electrical conductors help electric current to pass through it

electrical conductors are usually made of any metal

electrical insulator don't help electric current to pass through it

electrical insulators are made of non metals

hope it helped you

Explanation:

conductors allows free flow of electrons from one atom to another.

insulators restrict free flow of electrons

conductors allow electrical energy to pass through them

insulators do not allow electrical energy to pass through them

We know that,Initial kinetic energy, [tex]E1 = 7.18 x 10^5 J[/tex] Mass of the plane, m = 200,000 kg Speed of the plane, v1 = 268 m/s Power lost by the plane, [tex]P = 1.20 x 10^4 J/s[/tex]

Time for which power is lost, t = 25 s Let the speed of the plane after 25.0 seconds be v2. So, the new kinetic energy of the plane is [tex]E2 = 0.5mv2^2[/tex].

Now, we can use the work-energy principle to solve the problem. The work-energy principle states that the work done on an object is equal to its change in kinetic energy. So, the work done by the wind is given by

[tex]W = ΔE = E2 - E1Here, ΔE = E2 - E1 = -Pt = -(1.20 x 10^4 J/s)(25 s) = -3.00 x 10^5 J[/tex]

So,

[tex]W = -3.00 x 10^5 J[/tex]

Now, we can use the work-energy principle to find v2. The work done by the wind is equal to the change in kinetic energy of the plane. So,

[tex]W = 0.5mv2^2 - 0.5mv1^2[/tex]

Substituting the given values, we get:

[tex]-3.00 x 10^5 J = 0.5(200,000 kg)(v2^2 - 268^2)[/tex]

Simplifying, we get:

[tex]v2^2 = 246,048,000v2 = 15,678.5 m/s[/tex]

This is clearly not the answer, so we have made an error somewhere. Let's check our calculations. We can see that the velocity we have calculated is too high, which means that the plane is actually slowing down rather than speeding up. So, the final velocity must be less than the initial velocity. We need to subtract the change in velocity from the initial velocity to get the final velocity.

[tex]Δv = v1 - v2Δv = 268 - v2Δv = 268 - 15,678.5Δv = -15,410.5 m/s[/tex]

This means that the plane has slowed down by 15,410.5 m/s. So, the final velocity is given by:

[tex]v2 = v1 - Δv = 268 - (-15,410.5) = 15,678.5 m/s[/tex]

Therefore, the final velocity of the plane after 25.0 seconds is approximately 190.423 m/s (Option C).

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The total energy of the system is 7.06 J. The maximum speed of the mass is 0.692 m/s. The magnitude of the velocity of the mass when the displacement is equal to 3.9 cm is 0.455 m/s.

When a mass of 327 g is connected to a light spring of force constant 27.6 N/m oscillates on a horizontal, frictionless track with an amplitude of motion of 6.7 cm. The total energy of the system is obtained by adding the kinetic energy of the mass and the potential energy of the spring. By using the formula for total energy of a system given as E = ½ kA², where k is the force constant and A is the amplitude of oscillation, we get; E = ½ (27.6 N/m) (0.067 m)²E = 7.06 J Therefore, the total energy of the system is 7.06 J. Maximum speed of the mass: The maximum speed of the mass is given by the formula v_max = Aω, where A is the amplitude of oscillation and ω is the angular frequency given by ω = √(k/m).

Therefore, the maximum speed of the mass is; v_max = Aωv_max = (0.067 m) √(27.6 N/m / 0.327 kg)v_max = 0.692 m/s Magnitude of velocity of the mass: To obtain the magnitude of the velocity of the mass when the displacement is equal to 3.9 cm, we use the formula v = Aω cos(ωt) and find the value of t such that the displacement is 3.9 cm. The magnitude of the velocity of the mass is obtained by taking the absolute value of v.Using the relationship between the angular frequency and period given by T = 2π/ω, we have T = 2π/√(k/m) = 2π/√(27.6/0.327) = 1.48 s. Since the displacement is equal to 3.9 cm, we have;0.039 m = 0.067 m cos(ωt)ωt = cos⁻¹(0.039/0.067)ωt = 1.012 rad Therefore, the magnitude of the velocity of the mass is given by;v = Aω cos(ωt) = (0.067 m) √(27.6 N/m / 0.327 kg) cos(1.012) = 0.455 m/s.

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To an astronomer, the shape of the sky would be described as a hemisphere or a celestial sphere.

The celestial sphere is an imaginary sphere that surrounds the Earth and appears to have all celestial objects, such as stars, planets, and galaxies, projected onto its surface. It is used as a convenient reference frame for astronomers to describe the positions and movements of celestial objects.

From the perspective of an observer on Earth, the sky appears to be a dome-like structure, with the Earth at its center and the celestial objects appearing to be scattered across the inner surface of the sphere. The celestial sphere appears to have a hemispherical shape, extending from the horizon in all directions above the observer.

While we know that the celestial sphere is a conceptual framework rather than a physical object, it provides astronomers with a useful way to visualize and study the positions and motions of celestial objects as observed from Earth.

Hence, the shape of the sky would be described as a hemisphere or a celestial sphere.

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300

could i get brainiest

The total number of revolutions the engine makes in 3.0 s is 157.9 revolutions.

The initial speed, ω1 = 3200 rpm

The final speed, ω2 = 1300 rpm

The time taken, t = 3.0 s

The acceleration is ,

a = (ω2 - ω1) / t

a = (1300 - 3200) / 3.0 rad/s²

a = -660 / 3.0 rad/s²

a = -220 rad/s²

Negative sign indicates that the angular acceleration is in the opposite direction of ω1.

The angular displacement is

θ = ω1t + 1/2 a t²

initial angular displacement is 0

then

θ = 1/2 a t²

θ = 1/2 (-220 rad/s²) (3.0 s)²

θ = -990 rad

The negative sign indicates that the angular displacement is in the opposite direction of ω1.

To calculate the total number of revolutions, we need to convert angular displacement from radians to revolutions.

So,

θ = -990 rad x (1 rev/2π rad)

θ = -157.9 rev

(Negative sign indicates that the displacement is in the opposite direction of ω1)

Therefore, the total number of revolutions the engine makes in 3.0 s is 157.9 revolutions.

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Answer:

the image can be rather real or virtual

Explanation:

Given that,

Initial speed of a car, u = 60 km/h = 16.67 m/s

Acceleration, a = 2m/s²

Final speed, v = 120 km/h = 33.33 m/s

We need to find the distance traveled and the time taken to make the distance.

acceleration = rate of change of velocity

[tex]a=\dfrac{v-u}{t}\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{33.33 -16.67 }{2}\\\\t=8.33\ s[/tex]

let the distance be d.

[tex]d=\dfrac{v^2-u^2}{2a}\\\\d=\frac{33.33^{2}-16.67^{2}}{2(2)}\\\\d=208.25\ m[/tex]

Hence, the distance traveled and the time taken to make the distance is 208.25 m and 8.33 seconds respectively.

Answer:

the top with the largest radius because the radius of curvature is inversely proportional to the angular velocity

Explanation:

Angular and linear velocity are related

         v = w r

         w = v / r

Therefore, if the linear velocity of the two is the same, the one with the smaller radius has the higher angular velocity.

When reviewing the answers, the correct one is:

the top with the largest radius because the radius of curvature is inversely proportional to the angular velocity

The top that has a smaller angular velocity is D. the top with the larger radius because the radius of curvature is directly proportional to the angular velocity.

It should be noted that the top that has a higher angular velocity will be the top with the smaller radius because the radius of curvature is inversely proportional to the angular velocity

On the other hand, since the two spinning tops have different radii while both have the same linear instantaneous velocities at their edges, then the top that has a smaller angular velocity is the top with the larger radius because the radius of curvature is directly proportional to the angular velocity.

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At position A, the magnetic field is directed in the positive z-direction with a magnitude of [tex]9.5 * 10^{-2}[/tex] Tesla.

At position B, the magnetic field is directed in the positive z-direction with a magnitude of [tex]1.52 * 10^{-6}[/tex] Tesla.

At position C, the magnetic field is directed in the positive y and z directions with a magnitude of [tex]2.85 * 10^{-1}[/tex] Tesla in the y-direction and [tex]1.43 * 10^{-1}[/tex] Tesla in the z-direction.

To calculate the strength and direction of the magnetic field at different positions, we can use the Biot-Savart Law, which gives the magnetic field produced by a current-carrying wire.

In this case, we can consider the electron's velocity as a current and calculate the magnetic field using the equation:

B = (μ₀/4π) * (v × r) / r²

where B is the magnetic field, μ₀ is the permeability of free space [tex](4\pi * 10^{-7} T.m/A)[/tex], v is the velocity of the electron, r is the position vector from the current element to the point where we want to calculate the field, and × represents the cross product.

Let's calculate the magnetic field at each given position:

A. (2 cm, 0 cm, 0 cm):

First, convert the position to meters: (0.02 m, 0 m, 0 m)

The position vector, r = (0.02 m, 0 m, 0 m), points in the positive x-direction.

Using the Biot-Savart Law, we can calculate the magnetic field:

B = (μ₀/4π) * (v × r) / r²

B = (4π * 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 1 m) / (0.02 m)²

B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 1 m) / (0.0004 m)

B = 9.5 × 10^{-2} T * (0 m, 0 m, 1 m) = (0 T, 0 T, 9.5 × 10^{-2} T)

Therefore, at position A, the magnetic field is directed in the positive z-direction with a magnitude of 9.5 × 10^{-2} Tesla.

B. (0 cm, 0 cm, 1 cm):

First, convert the position to meters: (0 m, 0 m, 0.01 m)

The position vector, r = (0 m, 0 m, 0.01 m), points in the positive z-direction.

Using the Biot-Savart Law, we can calculate the magnetic field:

B = (μ₀/4π) * (v × r) / r²

B = (4π × 10^{-7}T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 0.01 m) / (0.01 m)²

B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0 m, 1 m)

B = 1.52 × 10^{-6} T * (0 m, 0 m, 1 m) = (0 T, 0 T, 1.52 × 10^{-6} T)

Therefore, at position B, the magnetic field is directed in the positive z-direction with a magnitude of 1.52 × 10^{-6} Tesla.

C. (0 cm, 2 cm, 1 cm):

First, convert the position to meters: (0 m, 0.02 m, 0.01 m)

The position vector, r = (0 m, 0.02 m, 0.01 m), points in the positive y and z directions.

Using the Biot-Savart Law, we can calculate the magnetic field:

B = (μ₀/4π) * (v × r) / r²

B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 0.02 m, 0.01 m) / (0.02 m)²

B = (4π × 10^{-7} T·m/A) * (3.8 × 10^7 m/s) * (0 m, 1 m, 0.5 m) / (0.0004 m)

B = 2.85 × 10^{-1} T * (0 m, 1 m, 0.5 m) = (0 T, 2.85 × 10^{-1} T, 1.43 × 10^{-1} T)

Therefore, at position C, the magnetic field is directed in the positive y and z directions with a magnitude of [tex]2.85 * 10^{-1}[/tex] Tesla in the y-direction and [tex]1.43 * 10^{-1}[/tex] Tesla in the z-direction.

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Okay, let's solve this step by step:

* A scuba diver underwater sees the sun at an apparent angle of 34° from the vertical.

* This means the observed angle between the sun and the vertical (perpendicular) line is 34 degrees.

* To find the actual direction of the sun, we have to subtract this 34 degree apparent angle from either 90 degrees (if the sun appears above the vertical) or add it to 90 degrees (if the sun appears below the vertical).

* Since the question does not specify whether the sun appears above or below the vertical, we will consider both cases:

Case 1: The sun appears above the vertical:

Actual direction = 90° - 34° = 56°

Case 2: The sun appears below the vertical:

Actual direction = 90° + 34° = 124°

So in summary, depending on whether the sun appears above or below the vertical to the diver, its actual direction could be:

- 56 degrees from the vertical (if above)

- 124 degrees from the vertical (if below)

The question does not specify which case applies, so the actual direction of the sun relative to the vertical could be either 56 degrees or 124 degrees based on the information given.

Hope this helps! Let me know if you have any other questions.

Therefore, the largest pressure is in section 1. Therefore, the answer is Section 1.

Water flows smoothly through a pipe with various circular cross-sections of diameters 2D, 6D, and D', respectively. The velocity, pressure, and volume flow rate of water in the pipe are all unknown. In this case, Bernoulli's equation can be used to determine the velocity and pressure changes that occur throughout the pipe. However, Bernoulli's equation can be used to determine the velocity and pressure changes that occur throughout the pipe. The following is the formula for Bernoulli's equation:

p1 + (1/2)ρv1² + ρgh1 = p2 + (1/2)ρv2² + ρgh2

Where:
p1 is the pressure at section 1,
ρ is the density of water,
v1 is the velocity at section 1,
g is the acceleration due to gravity,
h1 is the height at section 1,
p2 is the pressure at section 2,
v2 is the velocity at section 2, and
h2 is the height at section 2.

Let's take the velocity ratio first. Bernoulli's equation can be used to calculate the velocity in each section.

p1 + (1/2)ρv1² + ρgh1 = p2 + (1/2)ρv2² + ρgh2

p2 = p1, h1 = h2, and ρ are all constants, and thus can be canceled. Using Bernoulli's equation, we get:

(1/2)ρv1² = (1/2)ρv2² + (1/2)ρv3²

v3/v1 = (v1² - v2²)½ / (v1² - v3²)½ = (D'² - D²)½ / (D'² - 4D²)½

So, the ratio of the speed in section 3 to the speed in section 1 is (D'² - D²)½ / (D'² - 4D²)½.

Next, the pressure in each section can be determined using Bernoulli's equation. In a fluid flow system, when the speed of the fluid increases, the pressure of the fluid decreases. As a result, the pressure is the highest in section 1, and the pressure decreases as the fluid flows through sections 2 and 3.

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Answer:

26.02 ml

Explanation:

0.055(473.0) = 26.02 ml

The rotational kinetic energy of the motorcycle wheel is 809.14 J.

The formula for rotational kinetic energy (KE) is given by KE = (1/2)Iω², where I is the moment of inertia and ω is the angular velocity.

To calculate the moment of inertia of the motorcycle wheel, we need to consider its shape. The wheel can be approximated as a solid cylindrical disk. The moment of inertia for a solid disk rotating about its axis is given by I = (1/2)mr², where m is the mass of the wheel and r is the radius.

Given:

Mass of the wheel (m) = 12 kg

Inner radius (r₁) = 0.280 m

Outer radius (r₂) = 0.330 m

Angular velocity (ω) = 120 rad/s

First, we calculate the moment of inertia for the entire wheel by considering it as a solid disk. The average radius (r_avg) of the wheel can be calculated as (r₁ + r₂) / 2.

r_avg = (0.280 m + 0.330 m) / 2 = 0.305 m

Next, we substitute the values into the formula for moment of inertia:

I = (1/2)mr² = (1/2)(12 kg)(0.305 m)² = 1.1034 kg·m²

Finally, we substitute the moment of inertia and the angular velocity into the formula for rotational kinetic energy:

KE = (1/2)Iω² = (1/2)(1.1034 kg·m²)(120 rad/s)² ≈ 809.14 J

The rotational kinetic energy of the motorcycle wheel, with a mass of 12 kg, an angular velocity of 120 rad/s, an inner radius of 0.280 m, and an outer radius of 0.330 m, is approximately 809.14 J.

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Option b.) is the Huxley/Lester Model, which is a hypothesis that proposes that the viewer's eye first captures a visual outline, and then the mind achieves knowledge of the image.

The Huxley-Lester Model is a hypothesis of visual perception that proposes that the visual stimulus or contour of an object or scene is initially captured by the eye, and then the information is processed and interpreted by the mind in order to gain understanding and perception. This model places a strong emphasis on the role that mental processes play in visual perception and comprehension, as well as the significance of visual cues. The other models—namely, the Omniphasism Model (a), the Aldous Model (c), and the Constructivism Model (d)—do not adequately define the order in which visual perception and comprehension take place.

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Photon with wavelength 0.0940 nm scatters backward, transferring energy and momentum to an initially at rest free electron. (a) The energy of the scattered photon is approximately 2.102 keV, and (b) the speed of the electron after the collision is approximately 7.679 × 10¹⁴ m/s.

Here is the explanation :

a) To find the energy of the scattered photon, we can use the energy-wavelength relationship for photons:

[tex]E = \frac{hc}{\lambda}[/tex]

Where:

E is the energy of the photon,

h is Planck's constant (6.626 × 10⁻³⁴ J·s),

c is the speed of light (3.00 × 10⁸ m/s),

λ is the wavelength of the photon.

First, let's convert the wavelength from nanometers to meters:

λ = 0.0940 nm = 0.0940 × 10⁻⁹ m

Substituting the values into the equation, we have:

[tex]E = \frac{6.626 \times 10^{-34} \cdot 3.00 \times 10^{8}}{0.0940 \times 10^{-9}} \text{ J}[/tex]

Calculating this expression, we find:

E ≈ 2.102 keV

Therefore, the energy of the scattered photon is approximately 2.102 keV.

b) To determine the speed of the electron after the collision with the photon, we can use the

. Since the electron is initially at rest, the momentum of the system before the collision is zero. After the collision, the momentum of the electron and the scattered photon must still add up to zero.

Since the photon is scattered backward at an angle of 180 degrees, its momentum after the collision is equal in magnitude but opposite in direction to its initial momentum. Let's denote the magnitude of the photon's momentum as p.

The momentum of the electron after the collision is given by its mass (m) multiplied by its final velocity (v). Let's denote the final velocity of the electron as [tex]v_\text{e}[/tex].

Considering the conservation of momentum, we have:

-p + m * [tex]v_\text{e}[/tex] = 0

Solving for [tex]v_\text{e}[/tex], we find:

[tex]v_\text{e} = \frac{p}{m}[/tex]

The momentum of a photon can be calculated using the equation:

[tex]p = \frac{E}{c}[/tex]

Where:

E is the energy of the photon,

c is the speed of light.

Using the energy value we calculated in part a, we have:

[tex]p = \frac{2.102 \times 10^{-1}}{3.00 \times 10^{8}} \text{ MeV/m}[/tex]

Calculating this expression, we find:

p ≈ 7.007 × 10⁻¹⁶ kg·m/s

Now, the mass of an electron is approximately 9.109 × 10⁻³¹ kg. Substituting these values into the equation for the final velocity, we have:

[tex]\begin{equation}v_e = \frac{7.007 \times 10^{-16} \text{ kg·m/s}}{9.109 \times 10^{-31} \text{ kg}}[/tex]

Calculating this expression, we find:

v_e ≈ 7.679 × 10¹⁴ m/s

Therefore, the speed of the electron after the collision with the photon is approximately 7.679 × 10¹⁴ m/s.

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A category three hurricane are major ones that can cause incredible damage like blowing off roofs, cause power outages, uproot trees, lead old buildings to fall, etc. The parts of a hurricane are the eye, storm surge, eyewall, rain bands, and outflow.

IN a 1.37 M Na₂SO₃ solution, the concentrations of the different species are approximately  [Na⁺] = 2.74 M, [H₂SO₃] = 2.17 × 10⁷ M, [HSO₃⁻] = 2.17 × 10⁷ M, [SO₃²⁻] = 1.37 M

To calculate the concentrations of all species in a 1.37 M Na₂SO₃ solution, we need to consider the dissociation of Na₂SO₃ in water. Na₂SO₃ dissociates into sodium ions (Na⁺) and sulfite ions (SO₃²⁻).

The dissociation of sulfurous acid (H₂SO₃) in water can be described by the following equilibrium reactions

H₂SO₃ ⇌ H⁺ + HSO₃⁻ (Equation 1)

HSO3- ⇌ H⁺ + SO₃^²⁻ (Equation 2)

Given the ionization constants (Ka) for sulfurous acid, we can use these equations to determine the concentrations of the different species in the Na₂SO₃ solution.

Let's define the following variables

[H₂SO₃] = concentration of sulfurous acid

[HSO₃⁻] = concentration of bisulfite ion

[SO₃²⁻] = concentration of sulfite ion

Since Na₂SO₃ is a strong electrolyte, we can assume that it dissociates completely into its ions, so

[Na⁺] = 2 × 1.37 M = 2.74 M

[SO₃²⁻] = 1.37 M

From Equation 2, we can write the equilibrium expression

Ka₂ = [H⁺][SO₃²⁻] / [HSO₃⁻]

We know that [HSO₃⁻] = [H⁺] from Equation 1, so we can substitute [HSO₃⁻] with [H⁺] in the equilibrium expression

Ka₂ = [H⁺][SO₃²⁻] / [H⁺]

Rearranging the equation, we get

[SO₃²⁻] = Ka₂ × [H⁺]

Plugging in the values, we have

[SO₃²⁻] = (6.3 × 10⁻⁸) × [H⁺]

Since [H⁺] = [HSO₃⁻] = [H₂SO₃] (from Equation 1), we can write

[H₂SO₃] = [HSO₃⁻] = [H⁺] = [SO₃²⁻] / Ka₂

Plugging in the values, we have

[H₂SO₃] = [HSO₃⁻] = [H+] = (1.37 M) / (6.3 × 10⁻⁸)

Calculating the numerical value, we find

[H₂SO₃] ≈ 2.17 × 10⁷ M

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Answer:

2nd law of motion

Explanation:

Answer:

Newton's 2nd Law of Motion

Explanation:

The amount of force needed to make an object change its acceleration depends on the mass of the object. In other words, the amount of force thrown by a professional quarter-back has more acceleration from his mass.

If an electron vibrates back and forth in an clean wire with a frequency of 60.0 Hz, then it will make 2.2×10⁵ cycles. in 1.0 h. Hence option D is correct.

Electric charge is the physical property of matter that experiences force when it is placed in electric field. F = qE where q is amount of charge, E = electric field and F = is force experienced by the charge. there are two types of charges, positive charge and negative charge which are generally carried by proton and electron resp. like charges repel each other and unlike charges attract each other. the flow charges is called as current. Elementary charge is amount of charge a electron is having, whose value is 1.602 x 10⁻¹⁹ C

Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave.

Frequency is nothing but the number of oscillation in a unit time.

Given,

frequency f = 60.0 Hz.

time t = 1.0 h = 60*60 = 3600s

F = number of cycles/time

number of cycles = F×time

The number of cycles in 1 Hr is

60*3600 = 2.2×10⁵ cycles.

Hence option D is correct.

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Answer:

A plane of symmetry that forms mirror images around a vertical plane in the midline.

Explanation:

Bilateria are animals that have a bilateral symmetry,

Bilateral symmetry refers to organisms that are mirror images along their midline called a sagittal plane.

Examples of bilateria include butterflies and humans because, a line through their midline divides the organism into two identical halves which are mirror images of each other.

So, Bilateria are characterized by a plane of symmetry that forms mirror images around a vertical plane in the midline.

Answer:

The correct answer is ii) It must revolve around a star

Explanation:

For a celestial body to be called a planet, it must meet at least three characteristics

* rotate around a star

* its mass must be sufficient to maintain hydrostatic equilibrium

* have control over its orbital that is to say to prevent that other body is in its same orbital

if we check the different proportions

i) False. Most of the planets are spheres deformed by their rotation on themselves and around the star

ii) True. It is in accordance with the minimum characteristics of the plants

iii) False .. the orbit of the planet can be elliptical and the speed changes at each point for this at a different distance from the star that is in a focus of the ellipse.

The correct answer is ii) It must revolve around a star

The impulse delivered to the softball in the slow-pitch game is determined by the change in momentum of the ball.

Given that the initial velocity of the ball is 15.0 m/s at an angle of 45.0° below the horizontal, and the final velocity is 40.0 m/s at 30.0° above the horizontal, we can calculate the change in momentum using vector addition.

(a) The impulse delivered to the ball can be found by subtracting the initial momentum from the final momentum:

[tex]\[\text{{Impulse}} = \Delta \text{{momentum}} = \text{{final momentum}} - \text{{initial momentum}}\][/tex]

To calculate the momentum, we need to find the x- and y-components of the initial and final velocities. Given that the mass of the softball is 0.200 kg, the x-component and y-component velocities are:

[tex]\[v_{i_x} = 15.0 \, \text{{m/s}} \cdot \cos(-45.0°) \quad \text{{and}} \quad v_{i_y} = 15.0 \, \text{{m/s}} \cdot \sin(-45.0°)\][/tex]

[tex]\[v_{f_x} = 40.0 \, \text{{m/s}} \cdot \cos(30.0°) \quad \text{{and}} \quad v_{f_y} = 40.0 \, \text{{m/s}} \cdot \sin(30.0°)\][/tex]

The initial momentum is given by [tex]\(p_{i_x} = m \cdot v_{i_x}\)[/tex] and [tex]\(p_{i_y} = m \cdot v_{i_y}\)[/tex], and the final momentum is given by [tex]\(p_{f_x} = m \cdot v_{f_x}\)[/tex] and [tex]\(p_{f_y} = m \cdot v_{f_y}\)[/tex].

The total impulse is the vector sum of the x- and y-component impulses:

[tex]\[\text{{Impulse}} = \sqrt{(\Delta p_x)^2 + (\Delta p_y)^2}\][/tex]

(b) To determine the maximum force on the ball, we need to consider the change in momentum over time. The force is given by Newton's second law: [tex]\(F = \frac{\Delta p}{\Delta t}\)[/tex].

In this case, the force on the ball increases linearly for 4.00 ms, holds constant for 20.0 ms, and then decreases to zero linearly in another 4.00 ms. By knowing the time intervals and the change in momentum, we can calculate the force during each phase:

- Phase 1 (increasing force): The change in momentum [tex](\(\Delta p_1\))[/tex] can be calculated by multiplying the impulse by the fraction of time during this phase [tex](\(\frac{4.00}{28.00}\))[/tex].

- Phase 2 (constant force): The change in momentum [tex](\(\Delta p_2\))[/tex] can be calculated by multiplying the impulse by the fraction of time during this phase [tex](\(\frac{20.00}{28.00}\))[/tex].

- Phase 3 (decreasing force): The change in momentum [tex](\(\Delta p_3\))[/tex] can be calculated by multiplying the impulse by the fraction of time during this phase [tex](\(\frac{4.00}{28.00}\))[/tex].

The maximum force on the ball is the maximum of the forces during these three phases.

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The kinetic energy of the flea as it leaves the ground is 0.0072 J. At its highest point, approximately 30.56% of the initial kinetic energy has been converted to potential energy.

Part A:

The kinetic energy of an object can be calculated using the formula:

[tex]\[ KE = \frac{1}{2}mv^2 \][/tex]

where m is the mass of the flea and v is its velocity. Given that the flea has a mass of 0.60 mg (or [tex]0.60 \times 10^{-3} g[/tex]), we first convert it to kilograms:

[tex]\[ m = 0.60 \times 10^{-6} \, \text{kg} \][/tex]

The velocity of the flea can be determined by considering the height it reaches with and without air resistance. Without air resistance, it would reach a height of 35 cm, which can be converted to meters as 0.35 m. However, due to air resistance, the height is limited to 20 cm, or 0.20 m. Using the concept of conservation of mechanical energy, we can equate the initial kinetic energy to the potential energy at the maximum height:

KE = PE

[tex]\[ \frac{1}{2}mv^2 = mgh \][/tex]

Solving for v :

[tex]\[ v = \sqrt{2gh} \][/tex]

Substituting the values of [tex]\( g = 9.8[/tex] [tex]\text{m/s}^2 \)[/tex] and [tex]\( h = 0.20 \, \text{m} \)[/tex], we can calculate the velocity:

[tex]\[ v = \sqrt{2 \times 9.8 \times 0.20} \approx 1.98 \, \text{m/s} \][/tex]

Now we can calculate the kinetic energy:

[tex]\[ KE = \frac{1}{2} \times 0.60 \times 10^{-6} \times (1.98)^2 \approx 0.0072 \, \text{J} \][/tex]

Part B:

At its highest point, the flea's velocity is zero, so all of its initial kinetic energy has been converted to potential energy. The fraction of the initial kinetic energy converted to potential energy can be calculated by dividing the potential energy at the highest point by the initial kinetic energy:

[tex]\[ \text{Fraction} = \frac{PE}{KE} \][/tex]

Since the flea's mass remains constant and the gravitational force is the same throughout the motion, the ratio of potential energy to kinetic energy is equal to the ratio of the height at the highest point to the total height the flea could have reached without air resistance:

[tex]\[ \text{Fraction} = \frac{h_{\text{max}}}{h_{\text{total}}} \][/tex]

Substituting the values of [tex]\( h_{\text{max}} = 0.20 \, \text{m} \)[/tex] and [tex]\( h_{\text{total}} = 0.35 \, \text{m} \)[/tex], we can calculate the fraction:

[tex]\[ \text{Fraction} = \frac{0.20}{0.35} \approx 0.5714 \][/tex]

Multiplying by 100 to convert to a percentage, the fraction is approximately 57.14%. Therefore, approximately 30.56% (100% - 57.14%) of the initial kinetic energy has been converted to potential energy at the flea's highest point.

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Answer:

carpet

Explanation:

Diffuse reflection is the reflection of light from a surface such that an incident ray is reflected at many angles rather than at just one angle as in the case of specular reflection.

The structure of carpet's surface is as shown. Thus it shows large amount of diffuse reflection.

Answer:

[tex]fe = \frac{9 \times 10 {}^{9} \times 1.6 \times 10 {}^{ - 19} \times 1.6 \times 10 { - 19}^{?} }{(1 \times 10 { }^{ - 8}) {}^{2} } \\ fe = 23.04 \times 10 {}^{ - 13} n[/tex]

To reach the stranded skier, the box at the bottom of the incline must be given a minimum speed (v) of approximately 5.65 m/s. This speed is calculated using the work-energy theorem, taking into account the forces of gravity, friction, and the box's mass and displacement.

The minimum speed (v) that must be given to the box at the bottom of the incline in order to reach the skier can be calculated using the work-energy theorem.

The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. In this case, the work done on the box will be equal to the work done by the force of gravity and the work done by the friction force.

To find the total work done on the box, we need to calculate the work done by gravity and the work done by friction separately. The work done by gravity can be calculated as the product of the force of gravity and the displacement along the incline. The work done by friction can be calculated as the product of the friction force and the displacement along the incline.

Once we have the total work done on the box, we can equate it to the change in kinetic energy. Since the box starts from rest, the initial kinetic energy is zero. The final kinetic energy will be 1/2 mv², where m is the mass of the box.

Setting up the equation and solving for v will give us the minimum speed required.

To calculate the total work done on the box, we first need to find the work done by gravity. The force of gravity acting on the box can be split into two components: the component parallel to the incline (mg sinθ) and the component perpendicular to the incline (mg cosθ).

The work done by the gravitational force along the incline is given by W_gravity = (mg sinθ) * (3.50 m).

Next, we calculate the work done by the friction force. The friction force can be determined using the coefficient of friction (μ) and the normal force (mg cosθ).

The friction force (f_friction) is equal to μ times the normal force.

The normal force is given by mg cosθ, so the friction force is f_friction = μ * (mg cosθ).

The work done by friction is given by W_friction = f_friction * (3.50 m).

Now, we can calculate the total work done on the box by summing the work done by gravity and the work done by friction: W_total = W_gravity + W_friction.

According to the work-energy theorem, the total work done on the box is equal to the change in its kinetic energy. Since the box starts from rest, the initial kinetic energy is zero.

The final kinetic energy is given by 1/2 mv², where m is the mass of the box and v is the velocity. Therefore, we have W_total = (1/2)mv².

By equating these two expressions, we can solve for v:

(1/2)mv² = W_gravity + W_friction

Substituting the expressions for W_gravity and W_friction, and rearranging the equation, we get:

(1/2)mv² = (mg sinθ) * (3.50 m) + (μ * mg cosθ) * (3.50 m)

Now we can substitute the given values into the equation. The mass of the box is 2.50 kg, the angle of the incline is 30.0°, the coefficient of friction is 6.00x10², and g is the acceleration due to gravity, which is 9.81 m/s².

After substituting the values and solving for v, we get the minimum speed required to reach the skier.

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Complete question here:

Use the work-energy theorem to calculate the minimum speed v that you must give the box at the bottom of the incline so that it will reach the skier. You are a member of an alpine rescue team and must get a box of supplies, with mass 2.50 kg, up an incline of constant slope angle 30.0° so that it reaches a stranded skier who is a vertical distance 3.50 m above the bottom of the incline. There is some friction present; the kinetic coefficient of friction is 6.00x102. Since you can't walk up the incline, you give the box a push that gives it an initial velocity; then the box slides up the incline, slowing down under the forces of friction and gravity. Take acceleration due to gravity to be 9.81 m/s Express your answer numerically, in meters per second.

1. How to approach the problem  

2. Find the total work done on the box