If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two-hour-long movie
a. 1400
b. 25,000
c. 50,000
d. 170,000
e. This cannot be determined without knowing how many reels were used.
d
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A. quarks B. leptons C. bosons D. baryons E. electrons
From what cosmic epoch do the photons in the cosmic background radiation originate?
A) the end of the era of nuclei B) during the era of nucleosynthesis C) during the era of galaxy formation D) the end of the Planck era E) the moment of the Big Bang
A 7.5-kg otter slides down a hill, starting from rest at the top. The sloping surface of the hill is 8.8 m long, and the top is 6.5 m above the base
If the speed of the otter at the bottom of the hill is 9.2 m/s, how much energy was lost to nonconservative forces on the hill?
How tightly the nucleons in a nucleus are bound together is indicated by the nucleus's
a. atomic number b. mass number c. neutron number d. half life e. binding energy