A driver, traveling at 22 m/s, slows down her 2000 kg truck to stop for a red light. What work is done on the truck by the friction force of the road?
A) -2.2 × 104 J
B) -4.4 × 104 J
C) -4.8 × 105 J
D) -9.7 × 105 J
C
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A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N. If the 600-N force is removed, the resultant force acting on the crate is
A) zero. B) 200 N to the right. C) 200 N to the left. D) 400 N to the left. E) impossible to determine from the information given.
A block of ice slides down a ramp. For which height and base is the acceleration the greatest?
A. Height 4 cm Base 12 Cm B. Height 3 cm base 6 cm C. Height 2 cm Base 5 cm D. height 1m base 3
What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?
What will be an ideal response?
When your eye forms an image, the ________ plays a role analogous to the detector in a camera.
A) retina B) lens C) pupil D) optic nerve