A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2 . Determine the tension in the string
a. 11 N
b. 70 N
c. 48 N
d. 59 N
e. 62 N
B
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The length of a telescope is 2.00 m and the focal length of the objective is 2.0 cm. What is the focal length of the eyepiece?
A) 200 cm B) 202 cm C) 101 cm D) 2.0 cm E) 198 cm
A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s2 over a 5.0-s interval. What is the tangential component of acceleration for a point on the outer edge of the tire during the 5.0-s interval?
a. 33 m/s2 b. 6.7 m/s2 c. 0.60 m/s2 d. 0.30 m/s2
A 3.00 kg hollow sphere of radius 5.00 cm starts from rest and rolls without slipping down a 15.0 degree incline. If the length of the incline is 100 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 3.02 
B. 2.59
C. 2.37
D. 2.02
E. 1.75
Why is there a two day difference in the sidereal and synodic months?
A) The Moon speeds up at perigee, and slows down at apogee. B) The sidereal day is four minutes shorter than the solar day, and it adds up. C) The Earth is closer to the Sun during the sidereal month. D) The Earth is also revolving around the Sun, so the Moon must "catch up". E) The Moslem lunar year is only 354 days long, on average.