why can the sunlight that illuminates the earth be approximated by plane waves, whereas the light from a nearby lamp cannot?

Answer:

Explanation:

This sounds complicated but  ,  Butternight,  and maybe there is some difficulty in the ricochet.  I think the question is asking if the bullet bounces off a rock and heads North East....  or  NE,  but you've got it as  EN ?   Then how far does it go.  In my drawing,  what is X,  is the question.

We need to know how far the bullet travels East, and how far the bullet travels North.

Then we could put those two parts together and find the length of the red line in my drawing.  The red line is also referred to as the Magnitude.  

To find how far the bullet travels East,  use sine and cosine.  Do you know these?   if not,  start knowing  :D

Sine(36) = 0.587785....

Cosine(36)=0.809016....

640 * Sine(36)  => 640 * 0.587785  = 376.1825....  m  North

640 *Cosine(36)  => 640 * 0.809016 = 517.7708... m  East

Then the total distance traveled by the bullet to the East is 850 + 517.7708 = 1367.7708... m East

we can find the magnitude by using this [tex]\sqrt{North^{2} + East^{2} }[/tex]

[tex]\sqrt{376.1825^{2} + 1367.7708^{2} }[/tex] = 1418.559.... m NE

I used my calculator to find that.  :P

0.781 N is the horizontal component of the tension needed to produce this acceleration.

F=ma

T=ma

m= mass=0.05

a= centripetal acceleration =15.6

T=ma

T=0.05×15.6

T=0.781 N

When pressures on opposing ends are tugging on a rope, thread, wire, or something similar, tension is a contact force communicated through it. For instance, the rope attaching a tire swing to a limb of a tree is under strain. Gravity pulls the rope downward, while the upward pull is caused by a branch that is resisting the rope's tug tension, which is just a pulling force. A slack rope has no tension when one pushes on it. As a result, in a free-body diagram, the force of tension must always be shown in the direction that the string is pulling the item.

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The amount of Ra-226 left after4800 yrs with a half-life of 1600 yrs is  0.03125 g.

Half-life is the time taken for half the sample of a radioactive substance to disintegerate.

To calculate the amount of Ra-226 left, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the amount of Ra-226 left after 400 yrs is 0.03125 g.

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Answer:

See explanation...

Explanation:

the kinetic energy of the moving tennis racket is converted (not transformed) to the kinetic energy of the tennis ball.

Since not much description is given here, I didn't include the potential energy of the tennis ball. But in normal cases, the kinetic energy of the tennis ball would be converted to potential energy of the ball, and it falls back down after some time (because of gravity) and slows down due to friction on earth- kinetic energy is converted to heat energy because of friction.

other types of energy are not stated since they can be negligible.

G = 9.81 m/s2 is the acceleration caused by gravity. The skydiver's acceleration, who is currently descending at a speed that is one-fifth of his ultimate terminal speed, is 3.5316.

Acceleration: the rate at which the speed and direction of a moving object vary over time. A object and item moving straight forward is propelled when it increases or depreciates.

Acceleration is a component of velocity profile. As a result, velocity must remain constant if accelerations are zero. That constant, however, might be anything, such as 5 m/s. Additionally, zero acceleration is indicated if the speed is zero .

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The speed of the electron ejected from the electron gun is 13.25 x 10^6 m/s

How do you define electrostatic force?

                                           F = kq1q2/r2

In this case, F is the force, k is the proportionality factor, q1 and q2 are two electric charges, and r is the separation between their centres.

Let us assum that the electron from the electron gun is ejected and accelerated in a vacuum.

Therefore if we neglect the gravitational force we see that the entire electrical potential energy is changed into kinetic energy.

According to the given informations:

Ki = initial kinetic energy of the electron = 0

Kf = final kinetic energy of the electron = mv^2/2

Ui = initial potential energy of the electron = qV

Uf = final potential energy of the electron = 0.

From the law of Conservation of energy we know,

Ki + Ui = Kf + Uf.

Putting the values we have,

0 + qV = mv^2/2 +0

qV = mv^2/2

Solving the above equation we find v,

v = √2qV/m

  = √ 2 x

  = √2 (−1.60×10^−19C) (−500J/C) / 9.11×1^−31kg−

  = √175.6 x 10^12

  = 13.25 x 10^6 m/s

Hence, the speed of the electron is 13.25 x 10^6 m/s

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Answer:

yes

Explanation:yes

Answer:

Yes

Explanation:

Earth is accelerated around the sun

Answer:

Power required = 3.5E8 * 9.0E4 = 3.2E13     (watts)

Power supplied = 1.5E3 * .15 * 3600 * 6    (watts / m^2) * A

= 1.5E3* .15 * 3600 * 6 = 4.9E6 * A

A = 3.2 / 4.9 * E7 = 3.2 / 4.9 * 10 = 6.5 km*2    (1 km^2 = 10E6 m^2)

Note:  1 W = 1 J / sec    1 kw = 1000 W

The area needed to satisfy US energy needs using solar cells 6.5 km²

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

Power required = 3.5E8 * 9.0E4 = 3.2E13     (watts)

Power supplied = 1.5E3 * .15 * 3600 * 6    (watts / m^2) * A

= 1.5E3* .15 * 3600 * 6 = 4.9E6 * A

A = 3.2 / 4.9 * E7 = 3.2 / 4.9 * 10

= 6.5 km*2  

The area needed to satisfy US energy needs using solar cells 6.5 km².

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Compared to the rod of length L, the rod of length 2L has The same stress and same strain.

Since we know that Tensile Stress is determined by the relation :

Tensile Stress =  [tex]\frac{F}{A}[/tex]

Where F is the force applied and A is the circular area, which will definitely remain same for both of the rods as they have same diameter.

aslo the Tensile Strain, which is dependent on the young's modulus and stress which would remain same for both of the rods as the material used is same and the stress is alo the same.

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When the current in the wire is decreasing the oppose magnitude of the magnetic flux in the loops is Decreasing. Increasing support Induced currents in the loops and the forces exerted on them are directed so they Oppose this change.

The above statement was proved in Ampere's Circuital Law. According to the law the Current induced is directly proportional to the magnetic flux in the loops. So increasing the current would definitely oppose the change of decreasing the current.

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Magnetic force is used in: A door catch or a latch on kitchen cabinet

and A directional compass.

Electric force is used in: Two shocks stacks together coming out of a clothes dryers and An air filter that traps dust and ion particle.

Electromagnetic force is a result of charge motion, which also produces magnetic force. We know that a moving charge creates a magnetic field around itself. In this situation, the magnetic force can be thought of as a force that results from magnetic fields interacting.

A door catch or a latch on kitchen cabinet and a  directional compass are example of use of magnetic field.

Two shocks stacks together coming out of a clothes dryers and an air filter that traps dust and ion particle are example of use of etectric force.

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It will take the ball 0.61 second of time to strike the ground. Option C is the right answer.

The motion of an object under gravity is the object' s vertical motion under the influence of acceleration due to gravity.

Given that a ball is dropped from rest from a height of 1.88 m. Since the ball was dropped,

How long it takes, that is, the time taken to strike the ground can be calculated by using the formula

h = ut + 1/2gt²

Substitute all the parameters into the formula

1.88 = 0 + 1/2 × 10 × t²

1.88 = 5t²

t² = 1.88/5

t² = 0.376

t = √0.376

t = 0.61 s

Therefore, the time taken for the ball to strike the ground is 0.61 s

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According to the Brewster's law The angle of incidence is θ=tan −1n.

What is Brewster's law?
Brewster's law is a relationship for light waves that states that if a light ray is allowed to fall on the surface of the a transparent medium in a way that refracted ray makes a 90° angle with the reflected ray, the maximum polarisation (vibration in one aircraft only) can be achieved. The law bears Sir David Brewster's name, a Scottish physicist who first suggested it in 1811. The illustration depicts a ray of regular (nonpolarized) light with a particular wavelength striking a transparent medium's reflecting surface (e.g., water or glass).

According to Brewster's law,

the angle of incidence at which the reflected light is totally polarized for reflection from air to glass is governed by the relation

n=tanθ

∴θ=tan −1n

Hence, the angle of incidence is θ=tan −1n.

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The correct answer is vertical layout will enable to adjust height of the views and the data visualizations.

What is a vertical layout?

Use the Vertical Layout control to hold content vertically within it (stacked on-top of one another). Keep in mind that this control can be linked to a list, creating a recurring segment. The Horizontal Layout and Vertical Layout are two of the most often utilised controls when creating a user interface.

So according to given data that if we do require to change the height of views as well as Data Visualization, we require to implement Vertical Layout.

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The torque about the center of mass is the same as in a direction perpendicular to the door.

The rotational equivalent of a force in physics and mechanics is called torque. Depending on the subject matter, it may also be referred to as the moment, moment of force, rotational force, or turning effect. torque symbolizes a force's ability to cause a change in the body's rotational motion around center of mass. The idea was developed as a result of Archimedes' studies on the application of levers. Similar to how a linear force pushes or pulls an object, torque is a twist about a particular axis. The ratio of the force's magnitude to the angle at which the force's line of action is perpendicular to the axis of rotation is known as the torque.

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The reason that most SETI programs choose to listen at microwave radio frequencies is that sending information is via microwaves is the most efficient way.

Microwave radiation has wavelengths between one metre and one millimeter, which correspond to frequencies between 300 MHz and 300 GHz, respectively.

In the frequency range between about 20 kHz and about 300 GHz, radio frequency is the rate at which an alternating electric current or voltage, a magnetic, electric, or electromagnetic field, or a mechanical system, oscillates.

The most energy-efficient method of sending information is via microwaves. Because of this, the majority of SETI programmes opt to listen at microwave radio frequencies.

Hence , the reason that most SETI programs choose to listen at microwave radio frequencies is that sending information is via microwaves is the most efficient way.

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Answer:

Approximately [tex]1.90\; {\rm m}[/tex] (assuming that [tex]g = 9.81\; {\rm m\cdot s^{-2}}[/tex] and that air resistance on the bullfrog is negligible.)

Explanation:

It is given that the initial velocity [tex]u[/tex] is at an angle of [tex]\theta = 37.0^{\circ}}[/tex] above the horizontal. Therefore:

If air resistance on the bullfrog is negligible, final vertical velocity right before landing will be the opposite of the initial vertical velocity:

[tex]v_{y} = (-u_{y}) = (-2.64799)\; {\rm m\cdot s^{-1}}[/tex].

Change in vertical velocity:

[tex](v_{y} - u_{y}) = (-2.64799) \; {\rm m\cdot s^{-1}} - 2.64799 \; {\rm m\cdot s^{-1}} \approx (-5.29598)\; {\rm m\cdot s^{-1}}[/tex].

Vertical acceleration of the bullfrog will be [tex]a = (-g) = (-9.81)\; {\rm m\cdot s^{-2}}[/tex] while the frog is in the air. Therefore, time required for the velocity to change will be:

[tex]\begin{aligned} t &= \frac{v_{y} - u_{y}}{a_{y}} \\ &= \frac{v_{y} - u_{y}}{(-g)} \\ &\approx \frac{(-5.29598)\; {\rm m\cdot s^{-1}}}{(-9.81)\; {\rm m\cdot s^{-2}}} \\ &\approx 0.53985\; {\rm s}\end{aligned}[/tex].

If air resistance on the bullfrog is negligible, horizontal velocity will be constant: [tex]v_{x} = u_{x} \approx 3.51400\; {\rm m\cdot s^{-2}}[/tex]. After [tex]t \approx 0.53985\; {\rm s}[/tex] in the air, the horizontal displacement of the bullfrog will be:

[tex]\begin{aligned}x_{x} &= v_{x}\, t \\ &\approx 3.51400\; {\rm m\cdot s^{-1}} \times 0.53985\; {\rm s} \\ &\approx 1.90\; {\rm m} \end{aligned}[/tex].

Therefore, this bullfrog will cover a distance of approximately [tex]1.90\; {\rm m}[/tex].

Compounds, like water (H2O) and methane, are made of two or more atoms of various elements. Atoms are not scaled in drawings. Compound molecules contain atoms from two or more distinct elements.

As an illustration, the molecule of water (H2O) contains three atoms: two hydrogen (H) atoms and one oxygen (O) atom. Rust is created when oxygen from the air reactor with iron, which is BLANK with one type of atom (iron oxide). Oxidation reactions result in iron rusting. When something rusts, iron reacts with oxygen in the air and produces Fe2O3.xH2O, or hydrated iron (III) oxide.

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The time taken for a car that can accelerate at a rate of 0.6 m / s² to go from a speed of 55 mi/h to a speed of 60 mi/h is 3.68 s

a = ( v - u ) / t

a = Acceleration

v = Final velocity

u = Initial velocity

t = Time

a = 0.6 m / s²

v = 60 mi / h = 26.8 m / s

u = 55 mi / h = 24.59 m / s

t = ( v - u ) / a

t = ( 26.8 - 24.59 ) / 0.6

t = 3.68 s

Acceleration is the rate of change of velocity with respect to time. If the final speed is greater than the  initial speed it is called as acceleration and if the final speed is lesser than the initial speed it is called as deceleration.

Therefore, the time taken for this car is 3.68 s

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All matter has volume but also impenetrability because it occupies space, and two objects cannot occupy a same space at the same time.

An object that occupies space and has inertia is said to be matter, which is composed of numerous types of particles. The different kinds of particles each get a unique mass and size, according to the fundamentals of current physics. The electron, proton, and neutron are three of the most prevalent instances of material particles.

Anything with mass and physical space is considered matter. Matter underlies everything that you can see and touch. The three primary types of matter are gases, liquids, and solids. It also possesses qualities that can be expressed through conductivity, magnetism, solubility, density, etc.

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Since the drag force is proportional to the square of speed,  to improve your car’s gas mileage, you should drive in lower speed.

The drag force is a force experienced by an object when it is moving through a fluid. The fluid can be air, water, gas or liquid.

Some of the factors that affect the drag force are the speed of the object and its aerodynamic. The relation between drag force and velocity is given by:

F = 1/2 . CρAv²

Where:

C = drag coefficient

ρ = fluid density

A = area of the object that facing the fluid

v = velocity

Therefore, the drag force is directly proportional to the square of object's velocity, or

F ∝ v²

The power of car should overcome this drag force. The relation between power and force is given by:

P = F . v

Since F is proportional to v², then

P ∝ v³

Thus, we can conclude to use less power, which means to improve gas mileage, you should drive in lower speed.

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He attained the rank of military officer during the combat on the Western Front in World War I and was once more nominated for a Medal.

The pushing or push on a phalanx item alters its speed. An unseen factor is an agent that possesses the power to change the resting or traveling position of a body. It has a direction as well as a quantity.

Contact forces and non-forces are two different kinds of forces. Nuclear force, gravitational force, frictional force, magnetic force, electrostatic force, spring force, and others are a few examples of forces.

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Answer:

Golf ball ([tex]0.1\; {\rm kg}[/tex]): approximately [tex](-19.506)\; {\rm m\cdot s^{-1}}[/tex] (backwards).

Steel ball ([tex]8\; {\rm kg}[/tex]): approximately [tex]0.49383\; {\rm m\cdot s^{-1}}[/tex] (forward.)

Explanation:

Apply unit conversion and ensure that the unit of all mass are in kilograms: [tex]100\; {\rm g} = 0.1\; {\rm kg}[/tex].

In an elastic collision, both momentum [tex]p = m\, v[/tex] and kinetic energy [tex]\text{KE} = (1/2)\, m\, v^{2}[/tex] are conserved. Momentum of the two balls before the collision are:

Hence, the total momentum of the two balls was [tex]2\; {\rm kg \cdot m\cdot s^{-1}}[/tex] before the collision and (by conservation) will still be [tex]2\; {\rm kg \cdot m\cdot s^{-1}}\![/tex] after the collision.

Kinetic energy of the two balls before the collision are:

Thus, the total kinetic energy of the two balls will be [tex]200\; {\rm kg \cdot m^{2} \cdot s^{-2}}[/tex] before and after the collision.

Let [tex]m_{a}[/tex] and [tex]v_{a}[/tex] denote the mass and velocity of the golf ball after collision; [tex]m_{a} = 0.1\; {\rm kg}[/tex].

Let [tex]m_{b}[/tex] and [tex]v_{b}[/tex] denote the mass and velocity of the steel ball after collision; [tex]m_{b} = 8\; {\rm kg}[/tex].

Total momentum after the collision shall be [tex]2\; {\rm kg \cdot m\cdot s^{-1}}\![/tex]. Thus:
[tex]m_{a}\, v_{a} + m_{b}\, v_{b} = 2\; {\rm kg \cdot m\cdot s^{-1}}[/tex].

Total kinetic energy after the collision shall be [tex]200\; {\rm kg \cdot m^{2} \cdot s^{-2}}[/tex]. Thus:
[tex]\displaystyle \frac{1}{2} \, m_{a}\, v_{a} + \frac{1}{2}m_{b}\, v_{b} = 200\; {\rm kg \cdot m^{2}\cdot s^{-2}}[/tex].

Assume that the unit of [tex]v_{a}[/tex] and [tex]v_{b}[/tex] are both "meters per second" ([tex]{\rm m\cdot s^{-1}}[/tex].) Combine and solve this system of two equations and two variables:

[tex]\left\lbrace\begin{aligned}&0.1\, v_{a} + 8\; v_{b} = 2 \\ &\frac{1}{2}\, {v_{a}}^{2} + 4\, {v_{b}}^{2} = 200\end{aligned}\right.[/tex].

Rewrite the first equation to obtain [tex]v_{a} = 20 - 80\, v_{b}[/tex]. Substitute this equation into the second one to eliminate [tex]v_{a}[/tex]:

[tex]\displaystyle \frac{1}{2}\, (20 - 80\, v_{b})^{2} + 4\, v_{b}^{2} = 200[/tex].

Solve this equation for [tex]v_{b}[/tex]:

[tex]324\, {v_{b}}^{2} - 160\, v_{b} = 0[/tex].

There are two solutions to this quadratic equation: [tex](40 / 81)[/tex] and [tex]0[/tex]. Note that the velocity of the steel ball must be non-zero right after the collision. Hence, [tex]v_{b} \ne 0[/tex]. Therefore, the only possible value for [tex]v_{b}[/tex] will be [tex](40 / 81)\![/tex], which is approximately [tex]0.49383\; {\rm m\cdot s^{-1}}[/tex].

Substitute [tex]v_{b} = (40 / 81)[/tex] back into the first equation of the system and solve for [tex]v_{a}[/tex]: [tex]v_{a} = 20 - 80\, v_{b} \approx (-19.506)\; {\rm m\cdot s^{-1}}[/tex]. Note that the velocity of the golf ball [tex]v_{a}\![/tex] is negative since the golf ball is travelling backwards, opposite to its initial direction of motion.

In other words, the velocity right after collision will be approximately [tex](-19.506)\; {\rm m\cdot s^{-1}}[/tex] (backwards) for the golf ball and approximately [tex]0.49383\; {\rm m\cdot s^{-1}}[/tex] (forwards) for the steel ball.

Telescopes have to have a good motorized drive system to move them quickly and smoothly so that they can continue to point at the object being observed.

Astronomers use a telescope to observe distant things. Curved mirrors are used by the majority of telescopes, including all large telescopes, to collect and concentrate light from the night sky. The original telescopes employed lenses, which were curved pieces of clear glass, to focus light. The ability of an optical telescope to gather light is its most crucial ability. This capability is solely dependent on the telescope's aperture, or the diameter of the clear objective.

The telescope has a motorized drive mechanism that drives it smoothly from east to west at precisely the same rate that Earth is rotating from west to east in order to maintain the telescope's pointing at the object being seen because Earth is revolving.

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20 N , in +x direction is the vector sum of these Toro forces.

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The maximum distance the person will reach before he slip is 1.82m. Not even close to the middle of the ladder.

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The angular speed of the ball if it takes 0.5 seconds to make one complete revolution, is Option C. 4 π radius.

Angular speed is the velocity of the object in rotational motion. Distance traveled is represented as θ and is measured in radians. The time taken is measured in terms of seconds. therefore, the angular velocity is articulated in radians consistent with seconds or rad/s.

Angular velocity or rotational velocity, additionally called angular frequency vector, is a pseudovector illustration of how rapidly the angular function or orientation of an item modifications with time.

Calculation:-

The angluar speed ω = ΔΕ/ΔT

                                    = (2π - 0)/0.5

                                   = 4π radis

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When middle polarizer is rotated rotated at 100 revolutions per minute we can take following steps into consideration-

This effect although not normally done with mechanical rotation, is the basis for making optical modulators that are used in high-speed digital communication systems by inserting the thermometer in solution and note down the temperature.

Remove the caps of polarimeter glass tube and measure the length of tube.

Setting up of sodium source in front of slit will be placed at the principal focus of lens of polarimeter.

[tex]Rotation=\alpha =\frac{\beta }{y}[/tex]

β is the mean angle of rotation and y means length of polarimeter tube in decimeter.

[tex]y=\frac{len. of polarimeter}{10}[/tex]

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The gravitational force (Fg) for the first column is 1.96 x 10⁷ N.

The gravitational force (Fg) for the second column is 2.48 x 10⁷ N.

The gravitational force (Fg) for the third column is 3.24 x 10⁷ N.

The gravitational force (Fg) for the fourth column is 4.4 x 10⁷ N.

The gravitational force (Fg) for the fifth column is 6.36 x 10⁷ N.

The gravitational force (Fg) for the sixth column is 9.94 x 10⁷ N.

The gravitational force (Fg) for the seventh column is 1.77 x 10⁸ N.

Newton's law of universal gravitation states that every two objects in the universe attracts each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between the masses.

F = Gm₁m₂/r²

F = (Gm₁m₂) x 1/r²

where;

The gravitational force (Fg) for the first column is calculated as;

Fg = (Gm₁m₂) x 1/r²

Fg = (6.626 x 10⁻¹¹ x 4 x 10⁹ x 6 x 10⁹) x  1/r²

Fg = 1.59 x 10⁹  x 0.0123

Fg = 1.96 x 10⁷ N

The gravitational force (Fg) for the second column is calculated as;

Fg = (Gm₁m₂) x 1/r²

Fg =  1.59 x 10⁹  x 0.0156

Fg = 2.48 x 10⁷ N

The gravitational force (Fg) for the third column is calculated as;

Fg = (Gm₁m₂) x 1/r²

Fg =  1.59 x 10⁹  x 0.0204

Fg = 3.24 x 10⁷ N

The gravitational force (Fg) for the fourth column is calculated as;

Fg = (Gm₁m₂) x 1/r²

Fg =  1.59 x 10⁹  x 0.0277

Fg = 4.4 x 10⁷ N

The gravitational force (Fg) for the fifth column is calculated as;

Fg = (Gm₁m₂) x 1/r²

Fg =  1.59 x 10⁹  x 0.0400

Fg = 6.36 x 10⁷ N

The gravitational force (Fg) for the sixth column is calculated as;

Fg = (Gm₁m₂) x 1/r²

Fg =  1.59 x 10⁹  x 0.0625

Fg = 9.94 x 10⁷ N

The gravitational force (Fg) for the seventh column is calculated as;

Fg = (Gm₁m₂) x 1/r²

Fg =  1.59 x 10⁹  x 0.1111

Fg = 1.77 x 10⁸ N

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The density of the liquid sample is 1.52 g/ml.

Density is the substance's mass consistent with the unit of quantity. The symbol most customarily used for density is ρ, despite the fact that the Latin letter D can also be used. Density is the size of ways tightly a cloth is packed together. it's far defined as the mass consistent with unit quantity.

ρ = m/V, wherein ρ is the density, m is the mass of the item and V is the quantity of the object.

Calculation:-

Density = mass/volume

              = 22.8/14.7 g/ml

              = 1.52 g/ml

The density is of two types, one is absolute density, and the alternative is relative density. Relative density is also called unique gravity, which is the ratio of the density of a material to the density of a reference material. typically, the reference fabric is water.

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