Which of the following statements regarding the motion of objects on the celestial sphere is true?
A. The Moon moves along the Celestial Equator.
B. The stars move along the zodiac.
C. The stars move parallel to the Celestial Equator.
D. The Sun moves along the Celestial Equator.
Answer: C
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A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
A. 24 cm/s2 B. 16 cm/s2 C. 18 cm/s2 D. 34 cm/s2 E. 44 cm/s2
Approximately how long ago was Pluto discovered?
A) about 2000 years ago B) about 25 years ago C) about 75 years ago D) in ancient history E) about 200 years ago
Which terrestrial planet has the most moons?
A. Earth B. Mars C. Mercury D. Venus
An object attached to an ideal massless spring is pulled across a frictionless surface. If the spring constant is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at what is the mass of the object?
A) 20 kg B) 17 kg C) 22 kg D) 26 kg