Suppose you kick a soccer ball straight up to a height of 10 meters. Which of the following is true about the gravitational potential energy of the ball during its flight?
A) The ball's gravitational potential energy is greatest at the instant when the ball is at its highest point.
B) The ball's gravitational potential energy is greatest at the instant it returns to hit the ground.
C) The ball's gravitational potential energy is always the same.
D) The ball's gravitational potential energy is greatest at the instant the ball leaves your foot.
A) The ball's gravitational potential energy is greatest at the instant when the ball is at its highest point.
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Which statement describes a unique characteristic of Saturn? a. The density is so low it could float on water
b. The core temperature is hotter than the interior of the Sun. c. The rings are made up of ice from broken up comets d. The largest planet within the Solar System. e. The atmosphere is mostly made up of helium and methane.
Doppler Effect: Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?
A. 6.9 m/s B. 8.4 m/s C. 331 m/s D. 347 m/s
Forces and couples are applied to ABCDE as shown in the figure. All turns of ABCDE are 90o angles. The statically equivalent moment at A (MA) for the force2couple system is (in N?m)
(A) 2160i 1 575j 1 1480k
(B) 160i 1 425j 1 1380k
(C) 2160i 1 325j 1 1380k
(D) 2160i 1 325j 2 1480k
A distinctive feature of quarks is that they
A) are always observed singly, since they do not readily interact with other particles. B) have zero charge. C) have zero rest mass. D) have fractional electric charge.