The movement of a pool ball, after being struck by a cue, is an example of
A) Newton's first law of motion.
B) Newton's second law of motion.
C) Newton's third law of motion.
D) the universal law of gravitation.
E) conservation of momentum.
B
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During loading in a stress-strain test of a material, we observe that the plot is not linear and has no discontinuities. We can assume that:
(a) The material is nonlinear elastic. (b) The material is anelastic. (c) There is elastic and plastic strain. (d) None of the above can be assumed.
241Am decays by alpha particle emission. The daughter isotope in this case is (the atomic numbers of Np, Pu, Am, Cm, and Bk are 91, 92, 93, 94, and 95 respectively)
A) 239Np. B) 237Np. C) 245Bk. D) 235Bk. E) not given.
A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place?
The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB
Why does the same side of the moon always face Earth?
A. Sometimes the back side of the moon is lit by the sun. B. The moon rotates in the same direction that it revolves and the moon's period of rotation is equal to its orbital period. C. The moon does not rotate. D. The moon rotates in the same direction that it revolves. E. The moon's period of rotation is equal to its orbital period.