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College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter6: Uniform Circular Motion And Gravitation

Section: Chapter Questions

Problem 16PE: Olympic ice skaters are able to spin at about 5 rev/s. (a) What is their angular velocity in radians...

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Please answer the question and its subquestions entirely! This is one question with two subquestions. According to the official Bartleby guidelines, I am alowed to have up to two subquestion!

A race car makes two laps around the track in 150 seconds (2.50 minutes). What is the car's average angular speed?

		0.838 rad/s.
		0.168 rad/s.
		0.200 rad/s.
		0.248 rad/s.

The blades of a fan running at low speed turn at 26.2 rad/s. When the fan is switched to high speed, the rotation rate increases uniformly to 36.5 rad/s in 5.75 seconds. What is the magnitude of the fan's angular acceleration?

		3.22 rad/s²
		1.01 rad/s²
		2.01 rad/s²
		1.79 rad/s²

A motor develops 56,000 watts of power when its shaft turns at 300 rad/s. What is the torque on the shaft?

		30 N-m.
		187 N-m.
		17,000 N-m.
		It depends on the shaft diameter.

Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .

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