When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants
a. 0.500
b. 0.693
c. 0.725
d. 1.33
e. 1.39
e
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A 60.0-kg person rides in elevator while standing on a scale. The elevator is traveling downward but slowing down at a rate of 2.00 m/s2. The reading on the scale is closest to
A) 589 N. B) 708 N. C) 469 N. D) 120 N. E) 349 N.
A bicycle that travels four as fast as another when braking to a stop will skid
A) twice as far. B) four times as far. C) eight times as far D) sixteen times as far. E) depends on the mass of the bike
A rectangular wire loop (length = 60 cm, width = 40 cm) lies completely within a perpendicular and uniform magnetic field of magnitude of 0.5 T. If the length of the loop starts increasing at a rate of 20 mm/s at time t = 0, while the width is decreasing at the same rate, what is the magnitude of the induced emf at time t = 4.0 s?
a. 6.8 mV b. 5.2 mV c. 3.6 mV d. 8.4 mV e. 10 mV
When gaseous elements combine:
a. infinite amounts of each gas can combine in the same space because gases are not matter. b. very precise ratios of each gas combine to form gaseous compounds. c. gases only combine as mixtures, not as compounds. d. most cannot form compounds because they are already in the form of diatomic (i.e. two-atom) molecules. e. they form compounds with unpredictable ratios of each element.