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December 21, 2014

December 21, 2014

Posted by **fg** on Tuesday, May 3, 2011 at 7:32pm.

In what time interval will the tire rotate 3.5 times?

Answer in units of sec.

- physics -
**fg**, Tuesday, May 3, 2011 at 7:35pmAnswer in m/s.

The speed of a moving bullet can be deter-

mined by allowing the bullet to pass through

two rotating paper disks mounted a distance

72 cm apart on the same axle. From the

angular displacement 32.1 of the two bul-

let holes in the disks and the rotational speed

862 rev/min of the disks, we can determine

the speed of the bullet.

What is the speed of the bullet?

Answer in units of m/s.

- physics -
**fg**, Tuesday, May 3, 2011 at 7:35pmAnswer in revs.

The tub of a washer goes into its spin-

dry cycle, starting from rest and reaching an

angular speed of 4.2 rev/s in 4.5 s . At this

point the person doing the laundry opens the

lid, and a safety switch turns off the washer.

The tub slows to rest in 12.9 s .

Through how many revolutions does the

tub turn? Assume constant angular accelera-

tion while it is starting and stopping.

Answer in units of rev.

- physics -
**go**, Wednesday, May 11, 2011 at 4:42pmIn the Bohr model of the hydrogen atom,

the speed of the electron is approximately

1.97 × 106 m/s.

Find the central force acting on the electron

as it revolves in a circular orbit of radius

4.72 × 10−11 m.

Answer in units of N.

- physics -
**Anonymous**, Friday, November 9, 2012 at 5:22pm39.92

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