Carnot Engine: For a certain ideal Carnot engine, the hot reservoir is 35 C° higher than the cold reservoir. If this engine is to have an efficiency of 20%, what must be the temperature of the hot reservoir?
A. 70.0 K
B. 140 K
C. 175 K
D. 210 K
E. 245 K
Answer: C
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Force on a Wire: What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T so that the wire makes an angle of 27° with respect to the magnetic field lines.
A. 0.022 N/m B. 0.045 N/m C. 0.17 N/m D. 0.26 N/m
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the lowest point, where 
is the normal force, 
is weight, and
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B.
C.
D.
E.
Determine the impedance for the circuit.
?
?
A. 600 ? B. 1200 ? C. 1800 ? D. 2300 ? E. 1100 ?
If the magnetic field in a traveling electromagnetic wave has a maximum value of 16.5 nT, what is the maximum value of the electric field associated with this wave? (c = 3.00 × 108 m/s)
A) 5.5 × 10-17 V/m B) 4.95 V/m C) 0.495 V/m D) 55.0 × 10-16 V/m E) 55.0 × 10-15 V/m