Consider two blocks, one made of wood and the other of lead. They have the same dimensions but the lead is much more massive. If they are dropped and fall long enough to reach terminal velocity, which block experiences a larger force from air resistance?
A. The lead block
B. The force on each is equal
C. The wood block
D. It isn't important because air resistance can be ignored
Answer: A
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If Planck's constant were smaller than it actually is, how would the uncertainty principle be affected?
A) Quantum uncertainties would be unaffected, but quantum jumps would occur in a shorter time. B) Quantum uncertainties would then extend to lower-mass particles, such as electrons. C) Quantum uncertainties would be smaller. D) Quantum uncertainties would be larger. E) Quantum uncertainties would be unaffected, but quantum jumps would be smaller.
Intensity of Sound: Two people are talking at a distance of 3.0 m from where you are, and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers. Calculate a reasonable estimate for the sound intensity that the other student measures.
A. 6.2 × 10-8 W/m2 B. 1.5 × 10-7 W/m2 C. 8.3 × 10-8 W/m2 D. 7.8 × 10-7 W/m2 E. 2.5 × 10-8 W/m2
A 15-?F capacitor and a 30-?F capacitor are connected in series, and charged to a potential difference of 50 V. What is the resulting charge on the 30-?F capacitor?
A. 0.70 mC B. 0.80 mC C. 0.50 mC D. 0.60 mC E. 0.40 mC
f the distance between two point charges remains constant while the size of one of the charges is quadrupled, the force between the charges is multiplied by
A. 1/4 B. 2 C. 4 D. 16