A 50-kg satellite circles planet Cruton every 5.6 h in an orbit with a radius of 12 × 10^6 m. What is the magnitude of the gravitational force on the satellite by planet Cruton?
a. 63 N
b. 58 N
c. 68 N
d. 73 N
e. 50 N
b
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How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3
A) 31.5 B) 15.3 C) 53.1 D) 51.3
In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why? 
A. The cathode eventually stops emitting electrons. B. The kinetic energy of ejected electrons starts out small but quickly reaches a maximum value. C. The charge difference between the cathode and anode is initially small but with time becomes so large that no electron from the cathode can make it to the anode. D. The cathode eventually runs out of electrons to emit. E. Some other explanation (describe).
The condition for total internal reflection can be predicted from Snell's law since
A) the index of refraction of glass is about 1.5. B) the index of refraction of plastic is about 1.5. C) the value of tangent can be 1.0. D) the maximum value of the sine is 1.0. E) the maximum value of the sine is 1.5.
Which of the following statements is true of Charon, Pluto's moon?
A) Its orbital period is 21 days. B) It is responsible for tidal heating. C) It is made up of 60 percent water. D) Its motion is retrograde.