Pulsars are rotating white dwarfs.
Answer the following statement true (T) or false (F)
False
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A molecule in an ideal gas has an rms velocity 450 m/s. If the mean free path of the particle in the gas is 
then what is the average time between collisions?
a. 
b. 
c. 
d. 
e. 
The least energy required to produce forced vibration in an object occurs
A) below its natural frequency. B) at its natural frequency. C) above its natural frequency. D) none of the above
The initial mass of a protostar generally determines the star's future evolution. But in some cases, what can alter this process?
A) The star may be isolated in space, far from other influences. B) The star may gain mass by passing through a dark cloud. C) The star may be in a spectroscopic binary system. D) The star may drift away from the other stars in its formation cluster. E) The star may collide with another, unrelated star.
The cutting cord on a gas-powered weed cutter is 0.20 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord?
a. 628 m/s c. 19 m/s b. 25 m/s d. 63 m/s