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viktelen [127]
4 years ago
15

If the radius of the earth was suddenly tripled and its mass doubled, the surface gravitational acceleration would become: A) 9.

8 m/s^2
B) 2.18 m/s^2
C) 7.35 m/s^2
D) 14.7 m/s^2
E) 13.1 m/s^2
Physics
1 answer:
Mars2501 [29]4 years ago
8 0

Answer:

B) 2.18 m/s²

Explanation:

M = Original mass of earth

R = Original radius of earth

g = original acceleration due to gravity of earth = 9.8 m/s²

M' = New mass of earth = 2 M

R' = New radius of earth = 3 R

g = original acceleration due to gravity of earth = 9.8 m/s²

Original acceleration due to gravity of earth is given as

g=\frac{GM}{R^{2}}

9.8 =\frac{GM}{R^{2}}                               eq-1

g' = new acceleration due to gravity of earth

New acceleration due to gravity of earth is given as

g' =\frac{GM'}{R'^{2}}

g' =\frac{G(2M)}{(3R)^{2}}

g'=\left ( \frac{2}{9} \right )\frac{GM}{R^{2}}

Using eq-1

g'=\left ( \frac{2}{9} \right )(9.8)

g' = 2.18 m/s²

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Solution :

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The mass of Earth is greater than the mass of Mars. Therefore, the force of Earth is more than Mars.

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A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thicker and heavier. What i
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Answer:

the reflected wave is inverted and the transmitted wave is up

Explanation:

To answer this question we must analyze the physical phenomenon, with an wave reaching a discontinuity, we can analyze it as a shock.

Let's start when the discontinuity is with a fixed, very heavy and rigid obstacle, in this case the reflected wave is inverted, since the contact point cannot move

In the event that it collides with an object that can move, the reflected wave is not inverted, this is because the point can rise, they form a maximum at this point.

In the proposed case the shock is when the thickness changes, in this case we have the above phenomena, a part of the wave is reflected by being inverted and a part of the wave is transmitted without inverting.

The amplitude sum of the amplitudes of the two waves is proportional to the lanería that is distributed between them.

When checking the answers the correct one is the reflected wave is inverted and the transmitted wave is up

8 0
4 years ago
Read 2 more answers
You run<br> completely around a 400m track in<br> 80s. What was your average velocity?
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Answer:

V=?

S=400m

t=80s

V=S/t

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V=5m/sec

6 0
3 years ago
Rutherford tracked the motion of tiny, positively charged particles shot through a thin sheet of gold foil. Some particles
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Question

Rutherford tracked the motion of tiny, positively charged particles shot through a thin sheet of gold foil. Some particles  travelled in a straight line and some were deflected at different angles.

Which statement best describes what Rutherford concluded from the motion of the particles?

A) Some particles travelled through empty spaces between atoms and some particles were deflected by electrons.

B) Some particles travelled through empty parts of the atom and some particles were deflected by electrons.

C) Some particles travelled through empty spaces between atoms and some particles were deflected by small areas of high-density positive charge in atoms.

D) Some particles travelled through empty parts of the atom and some particles were deflected by small areas of high-density positive charge in atoms.    

Answer:

 

The right answer is C)    

Explanation:

In the experiment described above, a piece of gold foil was hit with alpha particles, which have a positive charge. Alpha particles <em>α</em> were used because, if the nucleus was positive, then it would deflect the positive particles. The principles of physics posit that electric charges of the same orientation repel.  

So most as expected some of the alpha particles went right through meaning that the gold atoms comprised mostly empty space except the areas that were with a dense population of positive charges. This area became known as the "nucleus".  

Due to the presence of the positive charges in the nucleus, some particles had their paths bent at large angles others were deflected backwards.

Cheers!

6 0
3 years ago
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