Author Question: Petra pushes a crate across a rough floor. A frictional force of 28.0 N acts to oppose the motion of ... (Read 157 times)

jake · **on:** Jul 28, 2018

Petra pushes a crate across a rough floor. A frictional force of 28.0 N acts to oppose the motion of the crate, and Petra pushes with a horizontal force of 36.4 N. If the net work Petra does is 94.5 J, through what distance did she push the crate?
a. 11.3 m
b. 3.38 m
c. 2.60 m
d. 2 650 m
e. 3 440 m

Question 2

A satellite is held in orbit by a 1 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:
a. 1.0108 J.
b. 8.0108 J.
c. 1.01011 J.
d. 0.
e. 8.01011 J.