Most stars in our part of the Galaxy are formed:
A) alone.
B) in open clusters of a few dozen.
C) in associations of thousands of stars across a spiral arm of the Galaxy.
D) in globular clusters of millions of stars.
E) in a singular event just after the Big Bang.
B
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Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and cord have negligible mass and 
(2.0 kg) moves on a horizontal surface without friction, 
(2.0 kg) is suspended vertically. What is the acceleration of 
?
A. 3.9 
B. 12
C. 6.0
D. 4.9
At present the universe is expanding, but we are not certain if this expansion will continue forever, come to a stop, or if the universe will ultimately collapse back into itself
What observational tests are possible to test among these three possibilities?
If the voltage amplitude across an 8.50-nF capacitor is equal to 12.0 V when the current amplitude through it is 3.33 mA, the frequency is closest to
A) 32.6 MHz. B) 5.20 MHz. C) 32.6 kHz. D) 5.20 kHz. E) 32.6 Hz.
The type of energy that a swinging pendulum has at the high point of its swing is
A) thermal. B) kinetic. C) spiritual. D) elastic. E) gravitational.