The total kinetic plus potential energy of a body
a. can be negative
b. always stays constant if the body is freely falling
c. always stays constant if friction is acting
d. can remain constant even if the body's speed is decreasing
A, B, D
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A ball is projected upward with an initial velocity of 10 m/s. It will reach its maximum height in approximately
A. 1.5 s. B. 1 s. C. 2 s. D. 2.5 s. E. 3 s.
Which of the following aging treatments of a precipitation-hardened alloy would be expected to result in the most stable precipitate particles?
(a) As-quenched (b) Under-aged (c) Aged to peak strength (d) Over-aged
Project a cannonball from atop Newton's hypothetical mountain at 8 km/s and it orbits Earth. Project it at 9 km/s and the shape of the orbit is
A) a somewhat larger circle. B) a wide parabola. C) an ellipse.
Why are lunar eclipses more commonly seen than solar eclipses?
A. Lunar eclipses occur at night and are easier to see. B. The Moon goes around the Earth faster than the Earth goes around the Sun. C. The tilt of the Moon's axis is smaller than the Earth's. D. The Earth casts a bigger shadow than the Moon.