Time and Date Stamps (logged): 17:12:20 06-10-2020 °¶Ÿ°±Ÿ±¯¯µŸ°¯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 18:55:22

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 turbine rotates through 21.24 radians while accelerating uniformly from 6 radians/second to 7 radians/second.

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Problem Number 2

One complete revolution around a circle corresponds to an angle of 360 degrees. This equivalence between degrees and complete circles is familiar.

Another way of measuring angular distance on a circle is with radians, with 2 `pi radians corresponding to a complete circle.

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Problem Number 3

A rigid rod rotating about the center of the circle holds an object in a vertical circle of radius .5899 meters.  Given the the object has mass 1.039 kg and moves at 1.299 m/s, what is its the centripetal force acting on it?

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Problem Number 4

A disk completes one revolution in 7 seconds.

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Problem Number 5

A hoop of radius 13.69 meters and mass 9.699 kilograms is attached to a hub centered at its axis of rotation, located at its center and perpendicular to the plane of the loop, by a massless rod.   A single mass of 4.5 kilograms is attached to the rod at a point 6.119 meters from the axis of rotation and a torque of 5.5 meter Newtons is exerted on the system.

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Problem Number 6

Using the approximation that 1 meter per second is about 2.3 miles per hour, find the centripetal acceleration of a 1158 kilogram automobile moving at 9 miles per hour on a circular track whose radius is 225 meters.