Author Question: A ball of mass 5.0 kg is suspended by two wires from a horizontal arm that is attached to a vertical ... (Read 1761 times)

imowrer · **on:** Jul 29, 2018

A ball of mass 5.0 kg is suspended by two wires from a horizontal arm that is attached to a vertical shaft, as shown in the figure.

The shaft is in uniform rotation about its axis. The rate of rotation is adjusted until the tensions in the two wires are EQUAL. At that speed, the radial acceleration of the ball is closest to

A) 4.9 m/s2.
B) 5.9 m/s2.
C) 6.9 m/s2.
D) 7.9 m/s2.
E) 9.9 m/s2.

Question 2

Engineers are designing a curved section of a highway. If the radius of curvature of the curve is at what angle should the curve be banked so that a car traveling at 29.0 m/s will stay on the road without the aid of frictional forces?

A) 23.9
B) 16.7
C) 21.0
D) 26.1