3 steps on the Richter scale represents about how many times more energy?
a. 32
b. 32000
c. 30000
d. 300
c
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A 25.0-mH inductor is connected in series to a 20.0-? resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the time constant of this circuit?
A) 0.800 × 10-3 s B) 0.800 × 10-2 s C) 0.500 s D) 1.25 × 10-3 s E) 12.5 × 10-2 s
What buoyant force is exerted by water on a 0.60-kg solid gold crown when it is immersed in water? The density of gold is 19.3 × 103 kg/m3 and that of water is 1000 kg/m3
A) 3.0 × 10-5 N B) 3.0 × 10-4 N C) 3.0 × 10-2 N D) 0.30 N
Matter waves were confirmed when it was found that electrons
a. diffract. b. have a plus or minus spin quantum number. c. possess a negative charge. d. have mass.
As sediment travels in a downstream river, it changes by getting
A) coarser. B) finer. C) more poorly sorted. D) more angular.