A 30-N box is pulled upward 6.0 m along the surface of a ramp that rises at 37° above the horizontal. How much work does gravity do on the box during this process?
A) -1100 J
B) -110 J
C) -140 J
D) -180 J
E) 120 J
B
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Which of the following are dwarf planets?
A. Uranus and Neptune B. Eris and Uranus C. Pluto and Eris D. Neptune and Pluto E. Mercury and Eris
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?
Ptolemy tried to describe the motion of the planets by devising a small circle, called a(n) ____, which rotated around the edge of a larger circle
a. epicycle b. foci c. deferent d. equant e. sphere
An instrument is rated at 250 W if it is connected across a 120-V dc power supply
(a) What current does it draw under normal operation? (b) What is its resistance? (c) How many kilowatt-hours does it use in a day if it is left on all the time?