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

Physics & Space Science

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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

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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

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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?

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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

Physics & Space Science