A bucket of water with total mass 23 kg is attached to a rope, which in turn is wound around a 0.050-m radius cylinder, with crank, at the top of a well. The moment of inertia of the cylinder and crank is 0.21 kgm2 . The bucket is raised to the top of the well and released to fall back into the well. What is the kinetic energy of the cylinder and crank at the instant the bucket is moving with a
speed of 6.0 m/s?
a. 2.1 × 10^3 J
c. 0.86 × 10^3 J
b. 1.5 × 10^3 J
d. 0.40 × 10^3 J
B
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Hardness is a measure of the resistance of a material to _____________by an indenter.
Fill in the blank(s) with the appropriate word(s).
A thin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin
The disk carries a total charge of +3.00 ?C distributed uniformly over its surface. Calculate the magnitude of the electric field due to the disk at the point x = 15.0 cm along the x-axis. (?0 = 8.85 × 10-12 C2/N ? m2) A) 9.95 × 105 N/C B) 4.98 × 105 N/C C) 3.31 × 105 N/C D) 2.49 × 105 N/C E) 1.99 × 105 N/C
Helium originates from
A) stellar nucleosynthesis only. B) the Big Bang only. C) mostly from stellar nucleosynthesis with a small contribution from the Big Bang. D) radioactive decay of elements heavier than carbon. E) mostly from the Big Bang with a small contribution from stellar nucleosynthesis.
When a proton passes through matter, it is possible for it to interact with the matter in such a way that an electron and a positron are produced; this interaction is referred to as
A) the photoelectric effect. B) the Compton effect. C) the de Broglie effect. D) pair production. E) none of the given answers