A 10-g bouncy ball is confined in a 8.3-cm-long box. What is its minimum energy? (h = 6.626 × 10-34 J ? s)
A) 3.2 × 10-46 J B) 9.4 × 10-75 J C) 8.1 × 10-65 J D) 1.3 × 10-20 J
C
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Waves on a String: What is the wave speed in a brass wire with a radius of 0.500 mm stretched with a tension of 125 N? The density of brass is 8.60 × 103 kg/m3.
A. 0.121 m/s B. 100 m/s C. 136 m/s D. 500 m/s E. 68.8 m/s
The critical temperature the core must reach for a star to shine by fusion is
A) 5,800 K. B) 11,000 K. C) 127,000 K. D) 10 million K. E) 100 million K.
The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days. The initial decay rate of the sample was 9.9 × 1013 Bq. (1 u = 1.6605 x 10-27 kg)
(a) What mass of 234Th was initially present? (b) What is the decay rate after 68 days?
If the Moon were covered with water, it would have
1) one high tidal bulge, 2) two high tidal bulges, 3) three high tidal bulges, 4) no tidal bulges, which would follow from 5) the same reason that Earth has two high tidal bulges. 6) no centrifugal force tide would exist on the Moon. 7) the Moon being much less massive than Earth. 8) the center of mass of Earth-Moon system that lies halfway to the Moon.