In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter
Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)
A) 2.4 × 1019 kg
B) 4.8 × 1019 kg
C) 1.2 × 1020 kg
D) 2.4 × 1020 kg
E) 4.8 × 1020 kg
C
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Meters: A galvanometer has an internal resistance of 100 ? and deflects full-scale at 2.00 mA. What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV?
A. 50.0 ? in series B. 50.0 ? in parallel C. 100 ? in series D. 100 ? in parallel
Based on the H-R diagram shown above, about how long does a main-sequence star of spectral type O spend fusing hydrogen into helium in its core?
A) 1000 years B) 10,000 years C) 10 million years D) 100 million years E) 1 billion years
Why are optical fibers important for communication?
a. They can carry thousands of times the information that wires can. b. Light goes faster than electricity. c. They carry digital information. Wires can't carry digital information. d. all of the above
A skydiver of 75 kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?
a. 15 m/s b. 49 m/s c. 30 m/s d. 42 m/s e. 36 m/s