Electrons are
a. positively charged. b. negatively charged.
c. uncharged. d. variably charged.
b
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A gasoline engine absorbs 2 500 J of heat at 250°C and expels 2 000 J at a temperature of 50°C. The magnitude of the change in entropy (in J/K) for the system is
a. 6.2 b. 4.7 c. 1.4 d. 10.9 e. 3.2
A wire loop of radius 0.250 m is placed in a uniform magnetic field of magnitude 0.740 T. The field is directed perpendicular to the plane of the loop. If the field reverses its direction, and its magnitude changes to 0.100 T in time 1.06 s, what is the magnitude of the average induced emf in the loop during this time?
a. 156 mV b. 119 mV c. 185 mV d. 741 mV
A skydiver steps from a helicopter and falls for a few seconds until terminal velocity is reached. Thereafter, until he opens his parachute, his acceleration
A) is constant. B) increases. C) decreases. D) is zero. E) none of the above
A 375-g stone hangs from a thin light string that is wrapped around the circumference of a frictionless pulley with a moment of inertia of 0.0125 kg ? m2 and a radius of 26 cm
When the stone is released, the stone accelerates downward and the pulley rotates about its axis as the string unwinds. (a) What is the magnitude of the acceleration of the stone? (b) What is the tension in the string?