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ChaNgeD

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3. .

**050kg**disk attached to the end of a

**.150-m**wire revovles uniformly on a flat, frictionless surface.

a) moving

**3 revolutions per second**, what is the force exerted by the wire on the object?

b)What is the speed of the disk?

4.How large must the coefficent of friction be between the tires and the road if the car is to round a level curve of

**radius 85m**at a speed if

**95 km/h**?

6. A satilite is place in orbit

**6.00x10^6**.

**Jupiter**has a

**mass of 1.90x10^7**and

**radius of 7.5x10^7**. Find the orbital speed.

7. The outer

**radius**of

**saturns**rings are

**170,000**. Find the period of the outer radius.