A rectangular wooden block measures 10.0 cm × 4.00 cm × 2.00 cm. When the block is placed in water, it floats horizontally,
with its bottom face 1.65 cm below the surface. What is the density of the wood? The density of water is 1.00 g/cm3.
A) 0.825 g/cm3
B) 1.21 g/cm3
C) 1.65 g/cm3
D) 0.606 g/cm3
E) 0.350 g/cm3
A
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A. the momentum is always a constant B. no work is done on a system by any nonconservative forces C. no work is done on a system by any forces D. work is done on a system in order to conserve energy
What proves the existence of the Kuiper belt?
A. the fact that comets are icy objects B. the fact that many comets orbit on the ecliptic C. Objects of the Kuiper belt were detected by the Hubble Space Telescope. D. the existence of short-period comets
A hydraulic jack is used to lift an automobile. If the input force is 200 N over a distance of 1 meter, the output force over a distance of 0.1 meter is ideally
A) 200 N. B) 500 N. C) 1000 N. D) 2000 N. E) none of the above
A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate. b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. d. both go around with equal angular velocities but in opposite directions.