A certain meteoroid a rock in space has been moving through our ...

[Mr.Thesaxman]

A certain meteoroid a rock in space has been moving through our solar system ever since the solar system was formed, 5 billion years ago. Suppose the meteoroid is far from all planets and stars, so that the effect of gravity is negligible.
 
  Neglecting gravity, is any physical work being done on the meteoroid?
  A) No, because the force of inertia on the meteoroid is balanced by the equal reaction force by the meteroid.
  B) Yes, because work is always required to move any massive object through a distance.
  C) No, because no forces are exerted on the meteoroid.
  D) Yes, because the force of inertia is exerted on the meteoroid while the meteoroid moves.
  E) Yes, because the meteoroid is moving.

Question 2

In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m.
 
  (1 hp = 746 W) (a) What is her total change in potential energy? (b) What was the minimum average power (in watts) that she expended during the 22 s? (c) What horsepower motor would be required to generate the same power?

[rachel]

Answer to Question 1

C

Answer to Question 2

(a) 6.3 kJ (b) 290 W (c) 0.39 hp

[Mr.Thesaxman]

Thank you!

[rachel]

Always glad to help...