The red laser beam from a helium-neon laser corresponds to a spectral line of
A) helium.
B) neon.
C) both of these
D) neither of these
Answer: B
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A 50.0-g ball traveling at 22.0 m/s is bounced off a brick wall and rebounds at 21.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 2.50 ms, what is the average acceleration of the ball during this time interval?
a. 1.72E+4 m/s2 b. 3.44E+4 m/s2 c. 8.60E+3 m/s2 d. 1.72E+1 m/s2 e. 4.30E+1 m/s2
What kind of a gas cloud can collapse and form stars?
A.) A very hot gas cloud that has a huge internal pressure can collapse and form stars. B.) A gas cloud that has a mass less than 10 solar masses can collapse and form stars. C.) The gas cloud must have a mass that exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud. D.) The gas cloud must have a mass that is smaller than the Jeans mass so that gravity overcomes the internal pressure in the cloud. E.) A black hole can collapse and form stars.
One important feature of the Carnot cycle is that it
A. predicts the maximum efficiency of a heat engine operating between two temperatures. B. maximizes the entropy of a heat engine operating between two temperatures. C. specifies the operating temperatures of any heat engine. D. converts all of the heat flowing into an engine to work.
If protons are accelerated from rest in a Van de Graff accelerator through a potential difference of 1.00 MV, what is their resulting speed?
a. 
b. 
c. 
d. 
e. 