One hundred milliliters of water is poured into a U-tube that has a cross-sectional area of 1 cm2. Then 100 milliliters of oil, with a density 80% that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube.
What will be an ideal response?
20 cm
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Most Greek philosophers believed in a(n) _______________ Universe
Fill in the blank(s) with correct word
If the mass of the Sun were smaller by a factor of 1/3, how would the force between the Sun and the Earth change?
A) it would remain unchanged B) it would decrease by a factor of three C) it would triple D) it would decrease by a factor of nine E) it would be nine times more
A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases. B) decreases. C) remains unchanged regardless of air resistance.
A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = ?1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
a. 60 kJ b. 45 kJ c. 75 kJ d. 90 kJ e. 230 kJ