You throw a rock horizontally off a cliff with a speed of 20 m/s. Assuming no effects of air, after 2.0 s, the magnitude of the velocity of the rock is closest to
A) 28 m/s
B) 20 m/s
C) 40 m/s
D) 37 m/s
A
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If the atoms are in irregular arrangements, the material is ______________.
Fill in the blank(s) with the appropriate word(s).
The purpose of using epicycles and deferents to explain the motion of the planets in the night sky was to account for
a. prograde motion. b. Mercury and Venus' limited angular distance from the Sun. c. retrograde motion. d. non-uniform speed of the planets in their orbits. e. precession of the equinoxes.
As the moon circles Earth, the net force on it is
A) backward. B) directed outward away from Earth. C) directed inward toward Earth. D) forward. E) zero.
Which of the numbers 0.1, 1.0, and 2.0 represent possible values for the COP of a heat pump?
1.0.1 only 2.1.0 only 3.2.0 only 4.all of these.