About how many 100-W light bulbs would you have to light up to use energy at the rate of one horsepower?
a. one or two
b. seven or eight
c. the question doesn't make sense—hp and W are unrelated
d. dozens
e. none of the above
b
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What is the rms speed of a helium atom:
(a) at 5. K? (b) at -196.° C (the boiling point of N2)? (c) at 100.° C?
Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 × 10^30 kg) and a radius equal to that of the Earth (6.4 × 10^6 m)
a. 9.0 × 10^6 kg/m3 b. 1.8 × 10^7 kg/m3 c. 1.8 × 10^9 kg/m3 d. 3.6 × 10^10 kg/m3 e. 9.0 × 10^7 kg/m3
Acceleration: A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. What is its average acceleration?
Fill in the blank(s) with the appropriate word(s).
Which of the lettered graphs below might also legitimately describe the potential energy for the same interaction (between the same two particles!) whose potential energy function is shown in the “original” graph in the upper left? In each case, the vertical axis is energy (increasing upward) and that axis crosses the horizontal axis where r = 0.
