A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly above the fish? (For water, n = 1.33.)
a. 50
b. 60
c. 40
d. 70
e. 110
b
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Series/Parallel Circuits: As more resistors are added in series to a constant voltage source, the power supplied by the source
A. increases. B. decreases. C. does not change. D. increases for a time and then starts to decrease.
Can anything be done to stretch out the fuel supply for fission nuclear reactors so that such reactors could be used for many more centuries?
A) No, because fission reactors must use uranium, and uranium resources will run out within a century. B) No, because fission reactors must use plutonium, and plutonium resources will run out within a century. C) Yes, by converting the 238U into 235U and then fissioning the 235U. D) Yes, by converting 238U into plutonium and then fissioning the plutonium. E) Yes, by using uranium that is less highly enriched that the uranium fuel in use today.
If we use the Doppler method to measure the period with which a star alternately moves toward and away from us due to an orbiting planet, then we also know the
A) orbital period of the planet. B) mass of the planet. C) distance to the star. D) radius of the planet.
A 2000 kg car is traveling on a banked curved icy road. The road is banked at an angle of 12.0 degrees and has a radius of curvature of 500 m. The velocity of the car necessary to travel on the icy road without sliding is
A. 32.3 m/s. B. 40.5 m/s. C. 42.8 m/s. D. 49.5 m/s. E. 50.2 m/s.