A hydraulic press multiplies a force by 100, which is done at the expense of
A) energy, which is divided by 100.
B) the distance through which the force acts.
C) the time through which the force acts.
D) the mechanism providing the force.
E) none of the above
Answer: B
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A) Anthropology B) Sociology C) Ecology D) Astrobiology
A physical pendulum is composed of a disc whose center of gravity is attached to a thin rod. The disc has a moment of inertia of 1?2 MR2. The mass of the disc is 500 gm and has a radius of 4.00 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 1.24 sec. B. 1.42 sec. C. 1.74 sec. D. 1.90 sec. E. 2.25 sec.
In references to nuclear chain reactions, what is meant by the term CRITICAL MASS?
What will be an ideal response?
The helium flash stage lasts several thousand years
Indicate whether the statement is true or false