A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.His kinetic energy at the top of the hill is
a. 0 J. b. 500 J.
c. some value between 0 and 500 J. d. none of the above.
a
RATIONALE: He is at rest.
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1) more slowly, 2) faster, 3) the same, and from the point of view of a person at the top of the skyscraper, the person at the ground level ages 4) more slowly. 5) faster. 6) the same.
The number of protons in the nucleus of an atom tells which element it is
Indicate whether the statement is true or false
An electric current can consist of
a. positive ions flowing in a liquid c. electrons flowing in a wire b. negative ions flowing in a liquid d. all of the above
The astrometric method looks for planets with careful measurements of a star's
A) position in the sky. B) brightness. C) velocity toward or away from us. D) distance from Earth.