How big is the normal audible range for humans?
a. Almost 2,000 hertz.
b. Almost 200 hertz.
c. Almost 200,000 hertz.
d. Almost 2,000,000 hertz.
e. Almost 20,000 hertz.
e
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A boy throws a rock with an initial velocity of at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory?
A) 0.110 s B) 0.194 s C) 0.215 s D) 0.303 s
In present day technology, a substance can become a superconductor
A. only at absolute zero temperature. B. at room temperature. C. at a temperature above the boiling point of water. D. at temperatures above 0 Kelvin but less than 100 Kelvin.
A particular material has an index of refraction of 1.25 . What percent of the speed of light in a vacuum is the speed of light in the material?
If you know the impulse that has acted on a body of mass m you can calculate
a. its initial velocity. b. its final velocity. c. its final momentum. d. the change in its velocity. e. its acceleration during the impulse.