Answer:
B. speed up
Explanation:
The acceleration of an object due to a body's gravity is:
g = GM / r²
where G is the universal constant of gravitation,
M is the mass of the body,
and r is the distance from the body.
As a planet approaches the sun, r decreases. As r decreases, g increases.
Answer:
16.7
Explanation:
Mechanical advantage is the ratio of the output force to the input force.
MA = Fout / Fin
MA = 2000 N / 120 N
MA ≈ 16.7
Answer:
0.018 J
Explanation:
The work done to bring the charge from infinity to point P is equal to the change in electric potential energy of the charge - so it is given by
where
is the magnitude of the charge
is the potential difference between point P and infinity
Substituting into the equation, we find