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
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.
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?