For this problem, assume that the acceleration of gravity is 10 m/s2 downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?
A) zero
B) 10 m/s upward
C) 10 m/s downward
D) 20 m/s downward
E) 20 m/s upward
C
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Evolutionary hypotheses suggest that planets form by natural and gradual processes
a. True b. False Indicate whether the statement is true or false
Two waves are described by y1 = 6cos(180t) and y2 = 6cos(186t) (both in meters). With what angular frequency does the maximum amplitude of the resultant wave vary with time?
a. 366 rad/s b. 6 rad/s c. 3 rad/s d. 92 rad/s e. 180 rad/s
What conditions must be met for complete destructive interference between two waves?
Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?
A) nuclear fusion and gravitational contraction B) nuclear fusion and nuclear fission C) nuclear fusion and supernova D) nuclear fission and supernova