Author Question: Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0 with the ... (Read 36 times)

Brittanyd9008 · **on:** Jul 28, 2018

Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0 with the horizontal and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which a 60.0-N frictional force acts on it over the 50.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)
a. 5550 J
c. 8150 J
b. 6550 J
d. 13,100 J

Question 2

A 2.00-kg block of ice is at STP (0C, 1 atm) while it melts completely to water. What is its change in entropy? (For ice, Lf = 3.34 105 J/kg)
a. zero
c. 1220 J/K
b. 584 J/K
d. 2450 J/K