UCM Practice

Asia puts her favorite Chris Brown CD in her car. If it spins with a frequency of 1800 revolutions per minute, what is the period of spin of the CD?

• 0.014 s

• 0.024 s

• 0.034 s

• 0.044 s

Gibby, the gerbil, runs on his exercise wheel, which turns around once every 0.5 s. What is the frequency of the wheel?

• 1 Hz

• 2 Hz

• 3 Hz

• 4 Hz

What is the radius of an automobile tire that turns with a frequency of 11 Hz and has a linear speed of 20.0 m/s?

• 0.29 m

• 0.39 m

• 0.49 m

• 0.59 m

A headband stuck to the inside of the washing machine spins around the drum once every 2 s at a distance of 0.50 m from the center of the drum. What is the headband's linear speed?

• 4.6 m/s

• 3.6 m/s

• 2.6 m/s

• 1.6 m/s

Papa John twirls pizza dough over his head with a frequency of 60 revolutions per minute. What is the tangential velocity of a meatball stuck on the dough if it flies off of the pizza 0.10 m from the pizza's center?

• 0.73 m/s

• 0.63 m/s

• 0.83 m/s

• 0.93 m/s

A blender of radius 2.5 m turns with a frequency of 0.020 Hz. What is the tangential velocity of a small piece of food stuck to the inside wall of the mixer?

• 0.114 m/s

• 0.214 m/s

• 0.314 m/s

• 0.414 m/s

A blender of radius 2.5 m turns with a frequency of 0.020 Hz. What is the centripetal acceleration of a small piece of food stuck to the inside wall of the mixer?

• 0.029 m/s²

• 0.039 m/s²

• 0.049 m/s²

• 0.059 m/s²

My physics teacher, Mr. Herring, tried to swing a pail of water around in a vertical circle fast enough so that the water wouldn't wet him up. If Mr. Herring's arm is 0.60 m long, what is the slowest speed that he must swing the pail to stay dry? Gravity is the centripetal acceleration.

• 4.5 m/s

• 1.5 m/s

• 3.5 m/s

• 2.5 m/s

Kelis is making a strawberry cake in her KitchenAid Mixer. A tiny, 0.0050-kg strawberry is rapidly spun around the inside of the container with a speed of 14 m/s, held by a centripetal force of 10 N. What is the radius of the mixer at this location?

• 0.098 m

• 0.108 m

• 0.118 m

• 0.128 m

What is the period of an automobile tire that turns with a frequency of 11 Hz and has a linear speed of 20.0 m/s?

• 0.061 s

• 0.071 s

• 0.081 s

• 0.091 s