Thermodynamic Devices: During each cycle, the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator. How much heat do the coils behind the refrigerator discharge into the kitchen each cycle?
A. 110 J
B. 150 J
C. 330 J
D. 480 J
E. 630 J
Answer: E
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A 90.0 kg scuba diver with tanks and equipment is submerged and floating underwater in seawater. The volume of the seawater displaced by the scuba diver with tanks and equipment is
A. 0.0508 
B. 0.0575
C. 0.0667
D. 0.0708
E. 0.0878
The "big bang" was an explosion of material that created galaxies flying away from the center of the explosion
a. True b. False Indicate whether the statement is true or false
How do astronomers infer the presence of magnetic fields in molecular clouds?
A) by measuring the amount of interstellar reddening B) by measuring the Doppler shifts of emission lines from gas clumps in the cloud C) by measuring the infrared light emitted by the cloud D) by measuring the polarization of starlight passing through the cloud E) by measuring the amount by which gravity is reduced
The position x, in meters, of an object is given by the equation x = A + Bt + Ct2, where t represents time in seconds. What are the SI units of A, B, and C?
A) m, s, s2 B) m/s, m/s2, m/s3 C) m, s, s D) m, m, m E) m, m/s, m/s2