As the space shuttle orbits the earth, the shuttle and the astronauts
accelerate towards the earth with the same acceleration. what effect does
this create?
o
a. the 'g' forces astronauts feel.
o
b. weightlessness
c. astronauts feeling dizzy when they land.
o
d. astronauts losing weight while in space.

The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings. 

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j