Author Question: A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the ... (Read 304 times)

itsmyluck · **on:** Jul 28, 2018

A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the mass at point A is 8.4 m/s, and at point B, it is 5.6 m/s. What is the change in mechanical energy between A and B caused by the force of friction?

a.
2.7 J

b.
8.8 J

c.
4.7 J

d.
6.7 J

e.
19 J

Question 2

A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. What is the change in mechanical energy done on the system between A and B by the force of friction?

a.
8.9 J

b.
7.3 J

c.
8.1 J

d.
6.6 J

e.
24 J