The bottom of a flat-bottomed aluminum boat has an area of 4.20 m2 and the boat's mass is 63.0 kg. When set afloat in water, how far below the water surface is the boat bottom? (water density = 1.00 × 10^3 kg/m3)
a. 15.0 m
b. 0.0150 m
c. 0.115 m
d. 0.265 m
e. 0.0250 m
b
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Galileo dropped two balls of different weights and found they accelerated equally to the ground below. Einstein imagined the same result for a side-by-side drop
A) without invoking gravity. B) in an accelerating vehicle. C) whether they were of the same mass or not. D) all of the above E) none of the above
What process best explains the observed pattern of abundances of elements with atomic numbers between 6 and 20?
A) radioactive decay of nuclei with odd numbers of protons B) fusion reactions with hydrogen nuclei C) fusion reactions with helium nuclei D) fusion reactions with neutrons
In a laptop computer, the power converter plugs into the wall's AC outlet and it plugs into the computer's DC power jack. The direct current is composed of
A. protons moving through the wire. B. electrons moving in the wire. C. exactly one half of the voltage of the AC that operates the power converter. D. both protons and electrons moving through the wire in the same direction.
Adams and Leverrier predicted the position of ________, which Galle confirmed
A) Jupiter B) Pluto C) Neptune D) Saturn E) Uranus