Author Question: A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous ... (Read 75 times)

viki · **on:** Jul 28, 2018

A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous medium. What is the change in mechanical energy caused by the force the viscous medium exerts on the sphere during this descent?
a. -6.1 J
b. -4.6 J
c. -5.3 J
d. -6.8 J
e. -2.7 J

Question 2

A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal surface on which it slides?
a. 0.34
b. 0.24
c. 0.13
d. 0.44
e. 0.17