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

Physics & Space Science

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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

Physics & Space Science

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?

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science