Temperature Scales: Express -40°C in °F.
A. -72°F
B. -54°F
C. -40°F
D. 4.4°F
Answer: C
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Classical theory predicted that the photocurrent, of the photoelectric effect, should be proportional to the
A) frequency of light. B) wavelength of light. C) intensity of light. D) electric field magnitude.
Homer says that we can safely use nuclear power because all radioactive nuclei are gone after two half-lives. Marge says that only the decay rate is zero after two half-lives. Which one, if either, is correct, and why?
a. Homer, because half of the nuclei disintegrate in each half-life. b. Marge, because the number of decays per unit time is halved in each half-life. c. Homer, because it's safe to handle radioactive substances after two half-lives. d. Both, because when all nuclei disintegrate the decay rate is also zero. e. Neither, because one quarter of the nuclei are left after two half-lives.
When a car goes around a circular curve on a level road without slipping,
a. no frictional force is needed because the car simply follows the road. b. the frictional force of the road on the car increases when the car's speed decreases. c. the frictional force of the road on the car increases when the car's speed increases. d. the frictional force of the road on the car increases when the car moves to the outside of the curve. e. there is no net frictional force because the road and the car exert equal and opposite forces on each other.
The motion of a piston in an auto engine is simple harmonic. If the piston travels back and forth over a distance of 10 cm, and the piston has a mass of 1.5 kg, what is the maximum speed of the piston and the maximum force acting on the piston when the engine is running at 4 200 rpm?