If a car engine has a thermal efficiency of 50% and it does 500 J of work in one cycle, how much energy does it expel to the cold reservoir each cycle?
1.250 J.
2.500 J.
3.750 J.
4.1000 J.
2
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A hollow conducting sphere of radius 12 cm had a charge of
C placed on it. What is the potential at the center of the sphere?
A. 0 V
B. 24 V
C. 
D. 
E. infinite
During aerobic respiration, glucose becomes _______________ (as it gives up electrons) and coenzymes become _______________ (as they accept electrons)
Fill in the blank(s) with correct word
Two objects, each of weight W, hang vertically by spring scales as shown in the figure. The pulleys and the strings attached to the objects have negligible weight, and there is no appreciable friction in the pulleys. The reading in each scale is
A) W. B) more than W, but not quite twice as much. C) less than W. D) 2W. E) more than 2W.
If the magnetic fields are very strong, such as around sunspots, how are spectral lines affected by the Zeeman effect?
What will be an ideal response?