The next closest star to Earth, Proxima Centuri, is 4.25 lightyears away. How far is that in meters?

Answer:

The focal length of a lens is the distance from the lens to the focal point.

For a convex lens the focal point is that point at which parallel rays will be focused after passing thru the lens.

Note:  For a concave lens the rays will diverge after passing thru the lens and will appear to come from a point on the same side of the lens from which the parallel rays strike the lens,

The slope of the illustrated graph would give us the velocity of the object whose motion is plotted in the graph.

Velocity refers to the rate of movement of objects along a particular line. In other words, the velocity of an object is the speed of the object in a specific direction relative to time.

Also, velocity = displacement/time.

In the graph, the slope is given by: Δy/Δx = displacement/time = velocity.

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Answer:

Explanation:

Remark

Though you  do not know what height the previous drone reached, I would think reading 8000 m would be quite an accomplishment. Answer 1: A

B: I wouldn't pick B. Increased cost isn't going to contribute to design success.

C. If the efficiency is low to start with, increasing it some won't matter. On the other hand if the efficiency is moderate or good increasing it by 35% is a good thing. Let's hold on to this answer.

D: It has to work at low altitudes in order to work at high altitudes. I wouldn't pick D

E: Popularity is something you never know will happen. I think C is your best second answer.

Answer: A and C

Answer:

See below

Explanation:

At the rope end where Cliff is :

W = f x d  

    100 N * 18 = 1800 J   of work input

13.)    At the weight end

          work done = f x d

                             = 500 N * 3 m = 1500 J    of work output

Cliff  only got 1500 J of work OUTPUT with 1800 J of work INPUT

    1500 / 1800 = 83.33 efficiency

The average acceleration between t = 5.6 s and t = 8.5 s is 2.31  m/s²

Acceleration is defined as the rate change of velocity with time.

acceleration a = (Δv) / (Δt)

An object is moving with initial velocity u =5.7 m/s and its final velocity v= -1.0 m/s.

Time taken for the change in speed, t= 8.5 - 5.6 = 2.9 seconds

The acceleration is given by

a = (-1 - 5.7)/ 2.9

a = -  2.31 m/s²

|a | = 2.31 m/s²

Thus, the object's acceleration is 2.31 m/s²

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[tex]\text{Power,}~ P = \dfrac{\text{Work done}}{\text{Time}}\\\\\\~~~~~~~~~~~~~=\dfrac{8 \times 1000~J}{4 \times 3600~ s}\\\\\\~~~~~~~~~~~~~~=\dfrac{80}{144}\\\\\\~~~~~~~~~~~~~~=0.56~ W[/tex]

Answer:

Explanation:

Energy used is power multiplied by time.

Power is energy used divided by time

8 kj is 8000 j

4 hours is 240 minutes

240 minutes is 14400 seconds

8000j divided by 14400 is 0.55 recurring, measured in watts

Answer:

50k is the km for this is the first send

The statement best describes deena's error is: Find acceleration by finding the area of the rectangle above the line.

Acceleration is given by the ratio of Resultant or total force acting on any object and the its mass.

Deena made a chart to summarize features of a velocity vs. time graph for objects with constant acceleration and objects with constant velocity.

In the  velocity time graph, the area under the curve shows the displacement of the object and the slope represents the acceleration.

Thus, the deena's error is  Find acceleration by finding the area of the rectangle above the line.

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Answer:

What the other dude said

Explanation:

Answer:

False

Explanation:

It is actually I = V/R and V = I × R

Answer:

If the resistors are in series the current thru the circuit will be the same for all of the resistors,

Normally, the value of a resistor is given in ohms but the question seems to imply that resistance is given in watts.

3900 + 1000 + 100 = 5000 watts        total power used in the circuit

P = I V

5000 = I * 200 volts

I = 25 amps

So      I^2 R = 1000 watts for the named resistor

R = 1000 / 25^2 = 1.6 ohms for the 1000 watt resistor

V = I * R = 25 amps * 1.6 ohms = 40 V across that resistor

Check: 3900 / 1000 * 40 = 156 volts

100 / 1000 * 40 = 4 volts

Total voltage drop = 40 + 156 + 4 = 200 volts         as given

The change which shows the best application of Newton’s laws of motion to achieve this goal is decreasing the mass.

It states that the force F is directly proportional to the acceleration a of the body and its mass.

F =ma

or a = F/m

The mass and acceleration are inversely proportional to each other. If mass is decreased, then the acceleration is increased.

Thus, the mass should be decreased to increase the acceleration.

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Answer: D

Explanation: Just did EDGE

Answer:

in this situation we have given a car note engine whose efficiency is 40%. Now it is told that it is desired to have an efficiency of 60%. Then we have to find the thing temperature force him intact temperature as we know that efficiency is given by that is neat is equal to this is one minus the lower temperature upon t higher temperature here lower temperature is the temperature of think and higher temperature is the temperature of source. So we can say that in the first case we are given the efficiency that is 40%. So this is 4100 is equal to, this is one minus deal upon, this is 500 From here we can find the value of lower 10%. This will comes out to be 300 Calvin. No, we have given that the efficiencies 60%. So we can the lower temperature remains him that is 300 Calvin. And we have to find the higher temperature. So we can say that this is 60 upon 100 is equal to this is one minus 300 upon th from here we can find the value of higher temperatures. So this is 300 upon th is equal to disease 40 by 100. Or we can say yes, you'll come out to be 7 50 Calvin. So this is the temperature and this is our answer for this. Given to shin. So we can say for that option, B is the correct choice. Thank you

Explanation:

Answer:

Equation of Special Relativity

[tex]E=mc^2[/tex]

where:

First, convert 4 g into kilograms as mass is measured in kg:

[tex]\implies \sf 4\:g = 0.004\:kg=4 \times 10^{-3}\:kg[/tex]

Substitute the given values into the equation and solve for E:

[tex]\begin{aligned}E & = mc^2\\\implies E & = \sf (4 \times 10^{-3}) \cdot(3 \times 10^8)^2\\& = \sf (4 \times 10^{-3}) \cdot (3^2 \times 10^{8(2)})\\& = \sf (4 \times 10^{-3}) \cdot (9 \times 10^{16})\\& = \sf 4 \cdot9 \times 10^{-3} \cdot10^{16}\\& = \sf 36 \times 10^{(-3+16)}\\& = \sf 36 \times 10^{13}\\& = \sf 3.6 \times 10^{14}\: \sf J \end{aligned}[/tex]

Use Albert Einstein's equation

m=0.004kg

Given data in the problem :-

From Newton's Laws of Motion we know that ,

v = u + at  [t = Time taken by aircraft to cover the distance]

⇒ 34 = 0 + 4t

⇒ t = 34/4 s

∴  t = 8.5 s

From Newton's Laws of Motion we also know that ,

S = u.t + 1/2a.t^2

⇒ S = 0×8.5 + 1/2 × 4 × (8.5)^2 m

∴  S = 144.50 m

Thus the distance travelled by the aircraft while accelerating is 144.50 meter .

The height of the chairlift above the snow when the ski falls off is determined as 20.4 m.

The height of the chairlift is calculated from the principle of conservation of mechanical energy as shown below;

P.E = K.E

mgh = ¹/₂mv²

gh = ¹/₂v²

h = v²/2g

where;

h = (20)²/(2 x 9.8)

h = 20.4 m

Thus, the height of the chairlift above the snow when the ski falls off is determined as 20.4 m.

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Answer:

Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides. Gravity creates stars and planets by pulling together the material from which they are made.

Explanation: Hope it helps you :))))

Have a good day

The following statement best describes how gravity helps protoplanets create layers in that gravity pulls materials and generates compaction, which produces heat and causes materials to melt, sink, and rise. Option A is correct.

Gravitation is a natural law by which all things with all matter are attracted towards one another. gravity causes weight to all matter and the gravity of the moon causes the ocean tides.

The force that draws massed bodies toward one another is known as gravity. Gravitatithus

According to the alternatives, gravity pulls things together and causes compaction, which generates heat and causes things to melt,

Thus, we may draw the conclusion that gravity draws materials and creates compaction, which generates heat and causes materials to melt, sink, and rise.

Hence option A is correct,

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Answer:

its A

Explanation:

The lighter one travel with the speed of 0.574 m/sec. Force is defined as the product of mass and acceleration. Its unit is Newton.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.

The two skaters push off against each other on frictionless ice, then torque act by the one skater on the other is equal.

P₁₂=P₂₁

F₁₂V₁ =F₂₁V₂

625 ×V₁= 725 N×  1.5 m/s

V₁=0.574 m/sec

Hence, the lighter one travel with the speed of 0.574 m/sec.

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Answer:

1.74 m/s

Explanation:

use the formula

     [tex]F_{1} v_{1} = F_{2}v_{2}[/tex]

the heavier skater being [tex]F_{1}[/tex] and the lighter skater being [tex]F_{2}[/tex]

    (725 N)(1.5 m/s) = (625 N) [tex]v_{2}[/tex]

solve for [tex]v_{2}[/tex]

  [tex]v_{2} =[/tex] 1.74 m/s

Considering the definition of weight, on Earth's surface at sea level, the weight of an object with a mass of 180 kg is 1764 N.

Mass is the amount of matter that a body contains and weight is the action exerted by the force of gravity on the body.

The mass of an object will always be the same, no matter where it is located. Instead, the weight of the object will vary according to the force of gravity acting on it.

The weight is calculated as the product of the mass of the object and the value of the gravitational acceleration or gravity:

Weight= mass× gravity

The value of the acceleration constant on Earth is 9.8 m/s². The weight is proportional to the mass of the object. The unit of weight is expressed in Newton (N).

In this case, you know:

Replacing on the definition of weight:

Weight= 180 kg× 9.8 m/s²

Solving:

Weight= 1764 N

Finally, on Earth's surface at sea level, the weight of an object with a mass of 180 kg is 1764 N.

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27. The energy , in electronvolts, of an emitted photon when an electron transition from n=3 to n = 2 is  -1.89 eV.

28. The energy of this emitted photon in joules is -3.0278 x 10⁻¹⁹ Joules.

29. The frequency of the emitted photon is 4.572 x 10¹⁴ Hz.

30. The color of light associated with this photon is Red.

It is the number of oscillations per second of the sinusoidal wave.

Given is the Great Nebula in the constellation Orion consists primarily of excited hydrogen gas.

The electrons in the atoms of excited hydrogen have been raised to higher energy levels. When these atoms release energy, a frequent electron transition is from the excited n = 3 energy level to the n = 2 energy level, which gives the nebula one of its characteristic colors.

27. The energy of transition between n = 3 to n = 2 is

E = R h e (1/n₁² - 1/n₂²)    

where R = Rydberg constant and h = Planck's constant.

Substitute the values, we get

E = 1.0974 x 10⁻⁷ x 6.626 x 10⁻³⁴ x 1.6 x 10⁻¹⁹ (1/3² - 1 /2²)

E = -1.89 eV

28. Energy in joules can be obtained by multiplying  1.6 x 10⁻¹⁹ . So we have

E =  -1.89 eV x   1.6 x 10⁻¹⁹ J/eV

E =  -3.0278 x 10⁻¹⁹ Joules

29. Wavelength associated with the photon emitted is

1/λ = R (1/n₂² - 1/n₁² )

Substitute the values, we get

1/ λ  = 1.524 x 10⁶ /m

The frequency is related to the wavelength as

f = c/λ   where c = speed of light

f = 3 x 10⁸ x  1.524 x 10⁶

f = 4.572 x 10¹⁴ Hz

30. The color of light associated with the photon of calculated frequency is Red.

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Answer:

c. Light energy to thermal energy

Explanation:

The energy from the sun comes in the form of light energy but is converted to thermal energy.

Answer:

0.7 amps

Explanation:

Assuming that resistance is in ohms units:

Current = Voltage / resistance

             = 70 / 100

             = 0.7 amps

The height at point B will be 30 m. Option D is corect.

Simple harmonic motion is a form of periodic motion in which the restoring force on a moving item is proportionate to the amount of the object's displacement.

At the highest point the kinetic energy is equal to the potential energy on the maximum height h;

[tex]\rm mgh = \frac{1}{2} mv^2 \\\\ 2gh=v^2 \\\\\ h= \frac{v^2}{2g} \\\\\ h=\frac{14^2}{2 \times 9.81}\\\\\ h= 9.9 \ m[/tex]

The height at point B is calculated by adding the initial height to the obtained height as;

[tex]\rm h_B = 15+9.9 \\\\ h_B = 29.9 \ m \\\\ h_B=30 \ m[/tex]

The height at point B will be 30 m.

Hence, option D is corect.

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If the occupants of the vehicle are not wearing a seat belt, they will continues moving forward at the same speed when brake is applied.

Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that form unless it is acted upon by an external force.

The law is also called the law of inertia.

Thus,  if the occupants of the vehicle are not wearing a seat belt, they will continues moving forward at the same speed when brake is applied.

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Power in a rotating body like shaft is the product of Torque and the angular speed of that shaft.

P = Tω

The Torque is related to the shearing stress is

T = π/16 xτ(Do³ -Di³)

* Given is the Torque T= 7.5 kN.m, the inner diameter Di = 0.075m, outer diameter Do= 0.1m

Then, the maximum shearing stress will be

7.5 x 10³ =  π/16 xτ x (0.1³ - 0.075³)

τ = 66.125 MPa

Thus, the shearing stress is 66.125 MPa.

* From the Torque equation

T/J = Gθ/l

Where, J = π/32 (Do⁴ -Di⁴) = 0.00000671 m⁴

l = length of shaft = 2m, modulus of rigidity G = 80GPa = 80x 10⁹ Pa.

Substitute the values, we get the angle of twist

7.5 x10³ /0.00000671 = 80x 10⁹xθ/2

θ = 0.0279 rad.

Thus, the angle of twist is0.0279 rad.

* Power generated by the shaft is

P = 2πNT/60

where N = revolution/ minute = 200

Put the values, we get

P =  2π x 200 x 7500/60

P = 157 kW.

Thus, the power generated is 157 kW.

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Explanation:

displacement, velocity, and acceleration are vector quantities, while speed (the magnitude of velocity), time, and mass are scalars. To qualify as a vector, a quantity having magnitude and direction must also obey certain rules of combination.

From the law of the conservation of energy;  the ratio of the total kinetic energy after the collision to the total kinetic energy before the collision must be 1.

The term momentum is the product of mass and velocity. The principle of conservation of linear momentum states that total momentum before collision must be the same as the total momentum after collision thus the  ratio of the total momentum after the collision to the total momentum before the collision must be 1.

Also, from the law of the conservation of energy;  the ratio of the total kinetic energy after the collision to the total kinetic energy before the collision must be 1.

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From what we know, we can confirm that the phrase in the question best describes the term "Theory".

We can say that this is the exact definition of a theory. In other words, a theory is an idea or hypothesis proposed as a possible solution to a known problem, which is backed up by facts and conclusions derived from many scientific experiments and investigations.

Therefore, we can confirm that the phrase in the question best describes the term "Theory".

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