The bottom of a flat–bottomed aluminum boat has an area of 4.0 m2, and the boat's mass is 120 kg. When set afloat in water, how far below the water surface is the boat bottom? (water density = 1.0 × 10^3 kg/m3)
a. 0.060 m
c. 0.030 m
b. 0.015 m
d. 0.075 m
C
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a. looks the same as the object. b. is said to be formed at infinity. c. is real. d. is reduced.
Given that our galaxy has a volume of approximately 8 1012 ly3, what is the average distance between civilizations if there are currently 1 million intelligent civilizations in our galaxy?
A) 1,500 ly B) 200 ly C) 320 ly D) 2,800 ly
400 cm3 of mercury at 0°C will expand to what volume at 50°C? Mercury has a volume expansion coefficient of 180 × 10-6/C°
A) 450 cm3 B) 422.8 cm3 C) 409.7 cm3 D) 403.6 cm3 E) 401.8 cm3
White dwarfs have such a low luminosity that even the nearest white dwarfs are not visible to the naked eye
Indicate whether the statement is true or false