1)A skateboard park has a banked curve of radius 74.9 m. If a skateboarder is going 13.6 m/s, what must the angle of the bank be in order for there to be no friction force to turn the circle?
a) 14.3°
b) 14.1°
c) 55.5°
d)68.0°

2) In classes, I used to swing my keys around in a vertical circle to demonstrate circular motion. Suppose at one particular point in the motion of the 150. g keys, when they were at the bottom of the 39.0 cm radius circle, the tension in the string was 8.00 N. What was the angular speed of the keys at that point?
a)12.7 rpm
b) 121 rpm
c)10.6 rpm
d) 101 rpm

3)A 4.45 kg steel block is spun around a motor at 33.0 rpm. The angular acceleration of the block is -1.86 rads/s² and it takes 1.86 s for the block to come to a complete stop. What is the angular displacement while the block slows to a stop?

a) 0.511 rev
b) 3.21 rev
c) 58.2 rev

d)9.26 rev

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