A engine goes through a cyclic process. During the cyclic process the engine does 600 J of work and has a heat output of 2400 J. What is the efficiency of the engine?
A. 10%
B. 20%
C. 35%
D. 55%
E. 62%
B. 20%
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Imagine that at a certain place in a river, water moves horizontally to the left. Consider an oriented sur-face facing upward. The flux of water velocity through this surface is
A. positive. B. negative. C. zero. D. Impossible to determine from the given information.
If the root mean square velocity of a particle in a gas is 450 m/s, and the particle collides with other particles every 
seconds on the average, then the mean free path is
A. 
B. 
C. 
D. 
E. 
About how many dots are seen in the Hubble Deep Field image, just within that image? What are the dots seen in the Hubble Deep Field?
A. 3000 galaxies. B. 3000 stars. C. 3 million galaxies. D. 100 galaxies. E. 3 million stars.
The strong nuclear force is the force that holds the protons and neutrons in the nucleus together
Based on the fact that atomic nuclei can be stable, briefly explain how you can conclude that the strong force must be even stronger than the electromagnetic force, at least over very short distances.