A ball is thrown upward with a speed and direction such that it reaches a maximum height of 18.0 m above the point it was released. At its maximum height it has a speed of 20.0 m/s. With what speed was the ball released?
A)
27.4 m/s
B)
24.3 m/s
C)
35.1 m/s
D)
31.3 m/s
E)
39.0 m/s
A
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Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
A) mass on the horizontal axis and luminosity on the vertical axis B) surface temperature on the horizontal axis and luminosity on the vertical axis C) mass on the horizontal axis and stellar age on the vertical axis D) interior temperature on the horizontal axis and mass on the vertical axis E) surface temperature on the horizontal axis and radius on the vertical axis
Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. As long as the current in the primary is steady at 3.0 A, the current in the secondary will be
a. 3.0 A. b. 6.0 A. c. 1.5 A. d. zero.
The only force acting on a 2.0-kg body as it moves along the x axis is given by Fx = (12 - 2.0x) N, where x is in m. The velocity of the body at x = 2.0 m is 5.5 m/s. What is the maximum kinetic energy attained by the body while moving in the +x direction?
a. 36 J b. 39 J c. 43 J d. 46 J e. 30 J
A 0.28-kg stone you throw rises 34.3 m in the air. The magnitude of the impulse the stone received from your hand while being thrown is
a. 0.27 Ns. b. 2.7 Ns. c. 7.3 Ns. d. 9.6 Ns. e. 34.3 Ns.