Compared to the diameter of a zirconium atom (A = 40), the diameter of a mercury atom (A = is approximately
A) four times as large.
B) twice as large.
C) the same size.
D) one-half as large.
E) one-quarter as large.
Answer: C
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A baseball pitcher, loosening up his arm before a game, tosses a 0.140-kg ball using only the rotation of his forearm, 0.290 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 24.0 m/s in a time of 0.450 s, what is the average angular acceleration of the arm and ball?
a. 3.13 rad/s2 b. 37.2 rad/s2 c. 15.5 rad/s2 d. 184 rad/s2 e. 25.7 rad/s2
Consider the spectra of the four objects shown beneath the laboratory spectrum. Based on these spectra, what can you conclude about Object 1?
A) It is moving away from us. B) It is composed mostly of hydrogen, helium, and iron. C) It is a star with a thin upper atmosphere. D) It is a hot object, with a temperature above 1 million K. E) It is moving toward us.
A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatically from an initial volume of 120 L to a final volume of 40.0 L. What is the final temperature of the gas?
A) 124 K B) 811 K C) 610 K D) 775 K E) 820 K
A 4 kilogram block of ice is removed from a freezer where its temperature was maintained at –20 degrees Celsius. How much heat does the ice absorb as it is warmed to –10 degrees? (The specific heat capacity of ice is 2,000 joules per kilogram degree Celsius.)