Of the main sequence stars, those of type ________ have the longest main-sequence life spans
A) K B) M C) O D) B E) G
B
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A mass 
is connected by a light string that passes over a pulley of mass M to a mass 
as shown in the figure. Both masses move vertically and there is no slippage between the string and the pulley. The pulley has a radius of 20.0 cm and a moment of inertia of 1?2 
If 
is 3.00 kg, 
is 6.00 kg and M is 4.00 kg, then what is the acceleration of the masses?
A. 5.05 
B. 4.75
C. 4.05
D. 3.44
E. 2.67
The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?
a. 2.4 m/s b. 3.0 m/s c. 5.4 m/s d. 7.7 m/s e. 49 m/s
How many nodes and antinodes are shown in the standing wave above?
a. two nodes and three antinodes b. one node and two antinodes c. one-third node and one antinode d. three nodes and two antinodes
Two marbles are rolling along parallel tracks (which may or may not be inclined). A stroboscopic photograph showing a top view of the positions of the marbles at equally spaced instants of time looks like this:
At what instant(s) of time do the marbles have the same instantaneous velocity?
A. At time tB
B. At time tG
C. At both tB and tG
D. Some instant between tC and tD
E. Some instant between tD and tE
F. Roughly time tD