Pascal's Principle: In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm. What force must be applied on the small piston in order to lift a car weighing 20,000 N on the large piston? Assume the pistons each have negligible weight.
A. 6.7 × 103 N
B. 5.0 × 103 N
C. 2.9 × 103 N
D. 2.2 × 103 N
Answer: D
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When light passes from a material with a high index of refraction into material with a low index of refraction:
a. none of the light is reflected. b. some light is reflected without a change of phase. c. some light is reflected with a 180° change of phase. d. the light that is not reflected has a 180° change of phase.
The mean life (time constant) of radon-222 is 5.526 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
A voltage V is applied to the primary coil of a step-up transformer with a 3:1 ratio of turns between its primary and secondary coils. A resistor R connected to the secondary dissipates a power P = 100 W
How much power is dissipated by the same resistor when the ratio of turns in the transformer is changed to 24:1 and the same input voltage is used? A) 12,000 W B) 2400 W C) 24,000 W D) 6400 W E) 100 W
Which of the systems listed below is the largest, having NA = NB and U = 6NA? for which there is a better than 1 in a billion chance of seeing one or the other solid having zero energy?
A. NA = 6 B. NA = 8 C. NA = 10 D. NA = 12 E. NA = 15