You are tuning a guitar by comparing the sound of the string with that of a standard tuning fork. You notice a beat frequency of 5 Hz when both sounds are present. You tighten the guitar string and the beat frequency rises steadily to 8 Hz. To tune the string exactly to the tuning fork, you should
1.continue to tighten the string.
2.loosen the string.
3.impossible to determine from the given information.
2
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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 horizontal surface. The vertically hanging mass is 6.00 kg and the mass on the horizontal surface is 4.00 kg. The acceleration of the 4.00 kg mass is
A. 1.98 
B. 3.92
C. 5.88
D. 6.75
E. 7.84
The interstellar ________ absorbs light from stars and makes them appear fainter and redder than they otherwise would appear
Fill in the blank(s) with correct word
Calcium carbonate is the major component of each of the following except
a. limestone. b. seashells. c. stalagmites. d. bones.
When space probe Voyager 2 passed by Saturn, its speed increased (but not due to firing its engines). What must have happened?
A) Voyager 2 must have dipped through Saturn's atmosphere. B) Saturn's rotation must have sped up slightly. C) Saturn must have lost a very tiny bit of its orbital energy. D) Saturn must have captured an asteroid at precisely the moment that Voyager 2 passed by.