1. If momentum in a 2 body collision is conserved then kinetic energy must be co

Question

1. If momentum in a 2 body collision is conserved then kinetic energy must be conserved.
True OR False

2. Why does a rocket move in empty space?

3. A turntable spinning at the rate of 33.3 rev/min has what approximate angular speed? (in rad/sec)

4. A 0.50kg is whirled around at the end of a 0.90m string. The rock sweeps out a horizontal circle. The string has a 450N capacity, what is the maximum tangential speed of the rock if the string doesn't break?

5. At what location does an artificial Earth satelite in a elliptical orbit have its greatest speed?

Explanation / Answer

1. False

 

Because in inelastic collision ,momentum is conserved but kinetic energy is not conserved.

2. So that it can't collide .

3. = (33.3*2)/60 = 3.48 rad/sec

4. T = mv^2/r

 

Thus v = (Tr)/m = 28.46 m/sec

5. All the points which are at least distance from the earth.

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