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# Problem 7.12 The earth's radius is 6.37Ã—106m; it rotates once every 24 hours. Part A What is the...

### Problem 7.12 The earth's radius is 6.37Ã—106m; it rotates once every 24 hours. Part A What is the...

Problem 7.12

The earth's radius is 6.37Ã—106m; it rotates once every 24 hours.

Part A

What is the earth's angular speed?

Part B

Viewed from a point above the north pole, is the angular velocity positive or negative?

Viewed from a point above the north pole, is the angular velocity positive or negative?

 positive negative zero The angular velocity cannot be determined on the north pole.

Part C

What is the speed of a point on the equator?

Express your answer to two significant figures and include the appropriate units.

v =

Part D

What is the speed of a point on the earth's surface located at 1/3 of the length of the arc between the equator and the pole, measured from equator ? (Hint: what is the radius of the circle in which the point moves?)

Express your answer to two significant figures and include the appropriate units.

v =

Problem 7.46

A 240 g , 23-cm-diameter plastic disk is spun on an axle through its center by an electric motor.

Part A

What torque must the motor supply to take the disk from 0 to 2000 rpm in 4.2 s ? Get solution