A 100 lb sack of potatoes falls from an airplane. As the velocity of fall increases, the air resistance also increases. When air resistance equals 100 lb, the acceleration of the sack will be ____ m/sec/sec
a. 0 b. 16 c. 32 d. 9.8 e. 24
a
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Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless 30.0 degrees incline. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The acceleration of the 4.00 kg mass is
A. 2.98 
B. 3.92
C. 5.88
D. 6.86
E. 7.84
Collisions between galaxies are thought to
A) be commonplace. B) have stopped about 5 billion years ago. C) be extremely rare. D) have never occurred. E) have only occurred between 10 and 15 billion years ago.
The peak of the radiation curve of a blackbody moves toward larger wavelength as its temperature __________
Fill in the blank(s) with correct word
A 3.00 kg mass is located at x = 2.0 cm and y = 0.0. A 3.00 kg mass is located at x = 0.0 and y = 2.0 cm. A 4.00 kg mass is located at x = 3.0 cm and y = -3.0 cm. Where is the location of the center of mass?
A. (+1.8 cm, -0.60 cm) B. (+1.8 cm, +0.60 cm) C. (+0.60 cm, -1.8 cm) D. (+3.5 cm, -0.6 cm) E. (+1.8 cm, +1.6 cm)