On which of Jupiter's moons do scientists think there may exist an ocean covered with ice?
A. Io
B. Europa
C. Callisto
D. Ganymede
Answer: B
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Energy and Momentum: A 0.32-kg ball is moving horizontally at 30 m/s just before suddenly bouncing off a wall Just after the bounce, it is moving horizontally at 25 m/s but in the opposite direction.(a) What is the magnitude of the change in momentum of the ball during the bounce?(b) What percentage of the ball's original kinetic energy was lost in the collision?
Fill in the blank(s) with the appropriate word(s).
Lightning is dangerous to humans because lightning strokes
a. carry large currents. b. have high voltages. c. have no resistance. d. fry whatever they hit.
For any object orbiting the Sun, Kepler's law may be written T2 = kr3 . If T is measured in years and r in units of the Earth's distance from the Sun, then k = 1 . What, therefore, is the time (in years) for Mars to orbit the Sun if its mean radius from the Sun is 1.5 times the Earth's distance from the Sun?
a. 1.8 years b. 2.8 years c. 3.4 years d. 4.2 years
Three satellites are launched into space connected together. Once in deep space, an explosive charge separates the three satellites and they move apart. The satellites each have different masses with m1 < m2 < m3 . Which of the following statements is always true?
a. The one with mass m1 receives the greatest impulse. b. The one with mass m3 receives the greatest impulse. c. The all must receive equal impulses. d. Although one or more of the above statements could be true in special cases, they are not always true.