Calculate (0.82 + 0.042) × (4.49 × 10^3), keeping only significant figures
a. 3870.8
c. 3879
b. 3870
d. 3900
D
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Momentum: A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound?
A. 1.2 kg ? m/s B. 1.8 kg ? m/s C. 4.4 kg ? m/s D. 5.4 kg ? m/s E. 72 kg ? m/s
At what minimum rate is a 60.0-kg boy converting his internal energy when, in 8.00 s, he runs up a flight of stairs that is 10.0-m high?
A) 75.0 W B) 735 W C) 4.80 kW D) 48.0 W
You slowly rub your wet finger around the thin rim of a wine glass while you hold its base firmly to a tabletop with your other hand. The resulting sounds illustrates
A) forced vibrations. B) resonance. C) both of these D) none of the above
Potential: If the result of your calculation of a quantity has SI units of kg ? m/(s2 ? C), that quantity could be
A. an electric field strength. B. a dielectric constant. C. an electric potential difference. D. a capacitance E. an electric potential energy.