Buoyancy: A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many kilograms of mass can be loaded onto the box before it sinks in a lake having water of density 1000 kg/m3?
A. 0.50 × 103 kg
B. 1.5 × 103 kg
C. 2.5 × 103 kg
D. 3.5 × 103 kg
Answer: C
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Magnifying Glass With the Image at the Near Point of the Eye: A person with normal eyesight uses a converging lens of focal length 10 cm as a magnifying glass to finish an engraving job. To see detail, he holds the lens very close to his eyes. At what minimum distance from the job must he hold the lens?
A. 14 cm B. 7.1 cm C. 9.4 cm D. 30 cm E. 20 cm
The surface gravity of Jupiter is only 2.5 times larger than Earth's, despite the fact that Jupiter's mass is more than 300 times that of Earth. How can this be?
A. Jupiter has no surface, so it does not have a surface gravity. B. The radius of Jupiter is much larger than Earth's, so a point in the cloud tops of Jupiter is farther from its center. C. Jupiter is mostly hydrogen and helium, while Earth is mostly iron and rock. D. The radius of Earth is 300 times smaller than the radius of Jupiter.
A painter of mass 70 kg climbs 3.0 m up a ladder. The painter's potential energy has increased by
A. 2058 J. B. 261 J. C. 1029 J. D. 686 J. E. 210 J.
Which of the Galilean moons is densest and most geologically active?
A) Europa B) Titan C) Callisto D) Ganymede E) Io