Saturday

April 19, 2014

April 19, 2014

Total # Posts: 8

**physics**

7.If a washing machine's drum has a radius of 28 cm and spins at 4.1 rev/s, what is the strength of the artificial gravity to which the clothes are subjected? Express your answer as a multiple of g.

**physics**

7.A turntable reaches an angular speed of 33.3 rpm, in 2.1 s, starting from rest. (a) Assuming the angular acceleration is constant, what is its magnitude? b How many revolutions does the turntable make during this time interval?

**physics**

6.A child pushes a merry go-round from rest to a final angular speed of 0.46 rev/s with constant angular acceleration. In doing so, the child pushes the merry-go-round 1.3 revolutions. What is the angular acceleration of the merry go-round?

**physics**

5.A car approaches the top of a hill that is shaped like a vertical circle with a radius of 55.5 m. What is the fastest speed that the car can go over the hill without losing contact with the ground?

**physics**

4.A 30.8-kg child swings on a rope with a length of 6.29 m that is hanging from a tree. At the bottom of the swing, the child is moving at a speed of 4.2 m/s. What is the tension in the rope?

**physics**

3.A roller coaster has a vertical loop with radius 27.1 m. With what minimum speed should the roller coaster car be moving at the top of the loop so that the passengers do not lose contact with the seats?

**physics**

2.A spy satellite is in circular orbit around Earth. It makes one revolution in 6.02 hours. (a) How high above Earth's surface is the satellite? (b) What is the satellite's acceleration?

**physics**

Two satellites are in circular orbits around Jupiter. One, with orbital radius r, makes one revolution every 17 h. The other satellite has orbital radius 4.2r. How long does the second satellite take to make one revolution around Jupiter?

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