Which of the following types of molecule is the most abundant in an interstellar molecular cloud?
A) CO
B) H2O
C) H2
D) NH3
C
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A baseball catcher puts on an exhibition by catching a 0.150-kg ball dropped from a helicopter at a height of 100 m above the catcher. If the catcher "gives" with the ball for a distance of 0.500 m while catching it, what average force is exerted on the mitt by the ball? (g = 9.80 m/s2)
a. 78 N c. 197 N b. 119 N d. 295 N
A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because of __________
Fill in the blank(s) with correct word
A circuit consists of an AC audio amplifier, a resistor, and a speaker, all in series. The amplifier puts out an alternating voltage of 16.0 V (rms), the resistance of the resistor is 10.0 ?, and the speaker has a resistance of 11.9 ?. What is the time-averaged power delivered to the speaker?
a. 21.5 W b. 30.5 W c. 6.35 W d. 8.69 W
In a gas of different types of molecules all at the same temperature, the speeds of the heavier molecules will generally be _____________ the speeds of the lighter molecules
a. the same as c. less than b. greater than d. unrelated to