The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 15.6 cm, what is its maximum speed when the engine is running at 3 480 rpm?
a. 28.4 m/s
b. 14.2 m/s
c. 56.9 m/s
d. 7.11 m/s
e. 3.55 m/s
b
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At temperatures well below half of the melting temperature, the primary mechanism of creep strain in metals is
(a) Cobel creep. (b) Dislocation glide. (c) Dislocation creep. (d) Herring-Nabarro vacancy flux
As discussed in the video, the leading hypothesis for why Mars changed holds that interior cooling led to loss of its magnetosphere, allowing the solar wind to strip atmospheric gas away. How has the MAVEN mission provided evidence for this hypothesis?
a. It has measured rates of gas loss from the atmosphere today. b. It has measured the rate at which Mars’s interior has lost heat. c. It measured the amount of atmospheric gas that Mars had long ago. d. It has measured the strength of the magnetic field that Mars had long ago.
Resistance
a) is measured in amperes. b) is the opposition to the flow of electric current. c) is the driving force that moves electrons in conductors. d) is not affected by temperature changes.
The coil of a generator is rotated twice as fast keeping all other factors constant. What happens to the value of the maximum induced emf?
A) It stays the same. B) It is reduced by a factor of 2. C) It is increased by a factor of 2. D) It is increased by a factor of 4. E) It is reduced by a factor of 4.