From meteorite and lunar rock samples, astronomers have determined the age of the Solar System to be ____
a. 4.6 million years
b. 10 million years
c. 2.4 billion years
d. 4.6 billion years
e. 8.4 billion years
d
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A telescope is constructed with two lenses separated by a distance of 25 cm. The focal length of the objective is 20 cm. The focal length of the eyepiece is 5 cm. Calculate the magnitude of the angular magnification of the telescope
a. 6 b. 4 c. 8 d. 10 e. 5
Solenoid: An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (?0 = 4? × 10-7 T ? m/A)
A. 860 B. 1590 C. 2320 D. 3180 E. 1220
Earth exerts a gravitational force of 7000 N on one of the communications satellites. What force does the satellite exert on Earth?
A. more than 7000 N B. 7000 N C. less than 7000 N D. zero
Which of the following moons has retrograde motion?
a. Ganymede b. Titan c. Miranda d. Triton