An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a. 0 K.
b. 0°C.
c. 0°F.
d. 0°R.
e. the same as the temperature of the heat source.
a
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The segment of wire (total length including portions of incoming and outgoing wire = 6R) is formed into the shape shown and carries a current I. What is the magnitude of the resulting magnetic field at the point P?
A.
B.
C.
D.
E.
Let "m" represent the mass of an electron, and "c" represent the speed of light. In order to create an electron-positron pair, we must start with a photon whose energy is
A) at least mc2. B) at least 2mc2. C) at least 4mc2. D) any value greater than zero. E) Actually it is impossible to create such pairs from photons.
A gamma ray is another name for a(n) __________
Fill in the blank(s) with correct word
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
a. 16 mV b. 50 mV c. 8.0 mV d. 0.10 mV e. 100 mV