Author Question: Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is ... (Read 64 times)

Tirant22 · **on:** Jul 28, 2018

Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37 to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate?
a. 120 J
c. 250 J
b. -120 J
d. 150 J

Question 2

A 1.0-kg chunk of ice at 0C melts, absorbing 80,000 cal of heat in the process. Which of the following best describes what happens to this system?
a. increased entropy
c. entropy maintained constant
b. lost entropy
d. work converted to energy