Time and Date Stamps (logged): 05:27:04 12-05-2008 ¯´Ÿ±¶Ÿ¯³°±Ÿ¯´Ÿ±¯¯· Precalculus II

Principles of Physics (Phy 121) Test_Set_8

Completely document your work and your reasoning.

You will be graded on your documentation, your reasoning, and the correctness of your conclusions.

Date and Time are 02-15-2001 17:03:01

Signed by Learning Lab Attendant: ______________________

Date and Time: ______________________

Attendant:

Test is to be taken without reference to text or outside notes.

Calculator is allowed.

No time limit but test is to be taken in one sitting.

Please place test in Dave Smith's folder when completed.

Student:

Completely document your work.

Undocumented and unjustified answers may be counted wrong.

Besides undocument and unjustified answers, if wrong, never get partial credit.

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Problem Number 1

A radian is the angle defined by a sector of a circle for which the arc of the circle is exactly as long as the radius of the circle.

There are also 360 degrees in a circle.

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Problem Number 2

A rigid rod rotating about the center of the circle holds an object in a vertical circle of radius 2.349 meters.  Given the the object has mass .4399 kg and moves at .4999 m/s, what is its the centripetal force acting on it?

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Problem Number 3

A mass of .6999 kilograms is constrained by a massless rod to move in a circle of radius 1 meters. A torque of 21.39 meter Newtons is applied to the system, which is initially at rest.

Find the quantity `tau / (mr ^ 2), where `tau is the torque, m the mass and r the radius of the circle.

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Problem Number 4

How long does it require for an object moving around a circle to sweep out a radial angleof 21.49 radians, if during that time it increases its angular velocity from 9 radians/second to 13 radians/second?  What is its angular acceleration?

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Problem Number 5

What are the centripetal acceleration and centripetal force holding an object of mass 70.99 kilograms in a circle of radius 6 meters when the object is moving at 19.99 meters per second?

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Problem Number 6

A disk of radius 3 meters requires 2.5 seconds to complete one revolution. What is its angular velocity in revolutions/second?