The purpose of an air bag in an auto is to
A. decrease the force applied to you during a collision.
B. reduce your speed just before a collision.
C. reduce the impulse on you during a collision.
D. make your momentum change occur over a shorter time during a collision.
Answer: A
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Which of the following types of galaxies are most commonly found in large clusters?
A) spirals B) ellipticals C) lenticulars D) irregulars
A heat engine would have 100% efficiency if its low-temperature reservoir were
A) as hot as its reservoir. B) at absolute zero. C) either of these D) neither of these
The study of eclipsing binary stars is very important because it allows astronomers to determine
A. the speed of stars from the Doppler shift of their spectral lines. B. the luminosity of each star. C. the brightness of each star. D. the distance between two stars. E. the diameters of stars.
A negative velocity, approaching zero, represents a negative acceleration
Indicate whether the statement is true or false