A dragster drives a quarter mile (402 m) at a constant rate of acceleration, starting from rest and finishing the race at a final speed of 450 km/hr. If the mass of the dragster is 975 kg, together with its driver, and rolling friction is ignored, what average power was developed by the engine, if 50% of the power developed by the engine was delivered to the wheels?
A. 4.7 MW
B. 1.2 MW
C. 0.6 MW
D. 2.4 MW
D. 2.4 MW
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Intensity of Sound: You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to
A. one-half its original value. B. one-fourth its original value. C. one-sixteenth its original value. D. None of these
A person of initial mass 70. kg climbs a stairway, rising 6.0 m in elevation. By how much does his mass increase by virtue of his increased potential energy?
What will be an ideal response?
Does a nuclear power plant have a "smoke" stack, and why?
A) Yes, the "cooling towers" that can be seen at nuclear power plants are, in reality, smoke stacks. B) No, because the plant creates no waste products. C) No, because the plant does not combust its fuel. D) Yes, because the plant releases its combustion products to the atmosphere through the stack. E) Yes, the plant releases its waste fission products to the atmosphere through the stack.
A drag racer starts from rest and accelerates at 8.0 m/s2 for the entire distance of 400 m (1/4 mile). What is the speed of the race car at the end of the run?
a. 32 m/s c. 64 m/s b. 40 m/s d. 80 m/s