The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A) 11.6 × 105 Pa
B) 11.6 × 104 Pa
C) 2.9 × 105 Pa
D) 2.9 × 104 Pa
C
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Which of the following is the best definition of inertial frame?
A. a frame of reference in which Newtonian mechanics holds true, but relativistic mechanics does not B. a frame of reference in which relativistic mechanics holds true, but Newtonian mechanics does not C. a frame of reference where there are no accelerations without applied forces D. a frame of reverence in which Newton's second and third laws hold, but not his first E. None of these choices are correct.
For electric power that costs 10 cents per kilowatt hour, the cost of operating a 110-V heater that uses 20 A for 10 hours is
A) $0.22. B) $0.55. C) $2.20. D) $5.50. E) none of the above
A source of sound remains stationary relative to the person in this figure. If the sound source remained stationary but the person moved toward the source, how would the frequency heard by the person change?
a. The frequency would be higher. b. The frequency would be lower. c. The frequency would remain the same. d. The answer depends on distance to the source.
As a result of the helium flash, a star's luminosity ________
Fill in the blank(s) with correct word