A Carnot engine runs between a hot reservoir at Th and a cold reservoir at Tc. If one of the temperatures is either increased or decreased by 3.5 K, which of the following changes would increase the efficiency by the greatest amount?
a. increasing Th
b. increasing Tc
c. decreasing Tc
d. cannot be determined from information given
c
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An electron, moving south, enters a magnetic field. Because of this field, the electron curves upward. We may conclude that the magnetic field must have a component
A) downward. B) towards the east. C) towards the north. D) upward. E) towards the west.
If you drop a bar magnet in a vertical copper pipe it will fall slowly because
A) of air resistance. B) it induces a magnetic field in the pipe that resists motion of the magnet. C) the copper is a good conductor of both electricity and magnetism. D) of electron repulsion.
A titanium bar (E 5 100 GPa, ? 5 0.33) with square cross section (b 5 75 mm) and length L 5 3.0 m is subjected to tensile load P 5 900 kN. The increase in volume of the bar is approximately:
(A) 1400 mm3
(B) 3500 mm3
(C) 4800 mm3
(D) 9200 mm3
Old Faithful geyser in Yellowstone Park shoots water hourly to a height of 40.0 m. With what velocity does the water leave the ground?
a. 14.0 m/s b. 19.8 m/s c. 20 m/s d. 28.0 m/s e. 784 m/s