Satellite Motion: If Earth had twice its present mass but it orbited at the same distance from the sun as it does now, its orbital period would be
A. 4 years.
B. 3 years.
C. 2 years.
D. 1 year.
E. 6 months.
Answer: D
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Determined the first value of the Hubble parameter
A. Gerard de Vaucouleurs |
B. Georges Lemaître |
C. Hubble’s Law |
D. Edwin Hubble |
E. Velocity or Speed |
F. Ho |
Rank these planets in order of the strength of the greenhouse effect on the planet, from the weakest to the strongest greenhouse effect.
A) Mars, Mercury, Earth, Venus B) Mercury, Venus, Earth, Mars C) Mercury, Earth, Mars, Venus D) Mercury, Mars, Earth, Venus E) Mars, Earth, Venus, Mercury
A galvanometer with a coil resistance of 80. ? deflects full scale for a current of 2.00 mA. What series resistance is required to convert it to a voltmeter reading full scale for 200. V?
A) 100.02 k? B) 99.92 k? C) 0.800 m? D) 13.2 M? E) 100. k?
A 60-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 25 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder
a. 1.4E+1 N b. 1.6E+2 N c. 2.4E+2 N d. 2.7E+2 N e. 4.2E+3 N