Author Question: A 5.00-kg object moves clockwise around a 50.0 cm radius circular path. At one location, the speed ... (Read 126 times)

mikaylakyoung · **on:** Jul 29, 2018

A 5.00-kg object moves clockwise around a 50.0 cm radius circular path. At one location, the speed of the object is 4.00 m/s.

When the object next returns to this same location, the speed is 3.00 m/s.
(a) How much work was done by non-conservative forces as the object moved once around the circle?
(b) If the magnitude of the above non-conservative forces acting on the object is constant, what is the minimum value of this magnitude?

Question 2

A convex mirror has

A)

no focal length.
B)

a positive or negative focal length depending on the object position.
C)

a positive focal length.
D)

a negative focal length.
E)

a positive or negative focal length depending on the object size.