How many elements have been identified?
a. 92
b. 104
c. 114
d. over 200
e. none of the above
C
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In general, the time it takes from when in interstellar cloud fragment first begins collapsing until it gives birth to a main-sequence star is
A) shorter for less massive stars. B) longer for less massive stars. C) about the same for all stars. D) dependent on the rotation rate of the star.
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
a. 8 × 10^?5 W/m2 b. 8 × 10^?6 W/m2 c. 3 × 10^?3 W/m2 d. 0.8 W/m2 e. 2.5 × 10^?5 W/m2
The position of a particle as it moves along the x axis is given for t > 0 by x = (t3 ? 3t2 + 6t) m, where t is in s. Where is the particle when it achieves its minimum speed (after t = 0)?
a. 3 m b. 4 m c. 8 m d. 2 m e. 7 m
A certain amount of a monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done by the gas?
A) zero B) 200 J C) 400 J D) -400 J E) none of the above