Power: Which one of the following quantities is equivalent to 1 W?
A. 1 V/A
B. 1 ? ? m
C. 1 V ? A
D. 1 V/?
E. 1 A ? s
Answer: C
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A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The velocity of the ball in m/s is
a. 0. b. 4.9. c. 9.8. d. 19.6. e. none of these.
An object of mass 0.50 kg weighs 2.0 N when it is 1.0 × 10^6 m above the surface of Planet X. The radius of the planet is 4.0 × 10^6 m. What free-fall acceleration will the 0.50-kg object experience when at the surface of Planet X?
a. 4.8 m/s2 b. 2.0 m/s2 c. 4.0 m/s2 d. 6.3 m/s2
Compared to the Earth, the Moon is no longer geologically active because
a. it is rotating too slowly. b. its radioactive elements were never abundant. c. it is much smaller in mass. d. its crust is too thin. e. it does not have water on its surface.
Using the mass balance Equation 8-10 of the steady state reaction of oxygen and hydrogen to produce water at a rate of 10 moles per minute, identify the rates of mass flow for O2, N2, and H2O. Also identify the mass generation rates for oxygen, nitrogen, and water.
