A student slides her 80.0-kg desk across the level floor of her dormitory room a distance 2.00 m at constant speed. If the coefficient of kinetic friction between the desk and the floor is 0.400, how much work did she do?
A)
64.0 J
B)
1.57 kJ
C)
26.7 J
D)
628 J
E)
24.0 J
D
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Weight and g: If you stood on a planet having a mass four times that of Earth's mass, and a radius two times that of Earth's radius, you would weigh
A. the same as you do on Earth. B. two times more than you do on Earth. C. two times less than you do on Earth. D. four times more than you do on Earth.
A 10.0 kg ball weighs 98.0 N in air and weighs 65.0 N when submerged in water. The volume of the ball is
A. 0.00337 
B. 0.00457
C. 0.00766
D. 0.00980
E. 0.00245
What is the Roche limit?
A. the distance astronomers can see into a planet's clouds B. the greatest distance from a planet that its satellites can orbit without falling into the Sun C. the mass a planet must exceed to have satellites D. the distance at which a moon held together by gravity may be broken apart by the planet's gravitational attraction
You have an empty 2-liter soda bottle and an empty 12-oz soda bottle. Which one has the higher frequency when you blow across the top? transverse waves
A. the 2-liter bottle B. the 12-oz bottle C. both have the same frequency D. depends on how hard you blow