Conventional automobile efficiencies cannot conceivably be higher than about 25%, even with perfect engineering. This is due to
A) the law of conservation of energy.
B) frictional loses inside the car plus unburned hydrocarbons.
C) the second law of thermodynamics.
D) road friction.
E) air resistance plus road friction.
C
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Which of the following procedures would not be expected to increase the fatigue-crack initiation life of a plain low-carbon steel?
(a) Case hardening (b) Shot peening (c) Decreasing the grain size (d) Annealing
What is the typical size of most known asteroids?
A) a few meters B) a few kilometers C) a few hundred kilometers D) larger than the Moon E) larger than the Earth
How does the explosion of a nuclear bomb provide evidence of the theory of relativity?
A) The bomb causes things in its vicinity to move at very high speeds, allowing scientists to measure effects of time dilation. B) The mass of the bomb when it explodes is much greater than its normal mass. C) The bomb shortens the lifetimes of all people who happen to be near it when it detonates. D) The bomb produces energy in accord with E = mc2, which is part of the theory of relativity.
If a 1-kg mass is completely converted into energy, the amount of energy released would be 9 × 10^16 J
a. True b. False Indicate whether the statement is true or false