All galaxies are expanding away from every other galaxy in the universe in a manner similar to
A. a telephone that is on hold.
B. dots of ink on a balloon that is being inflated at a birthday party.
C. pancake syrup on a pancake on Saturday morning.
D. a tape recording that is played backwards at double speed.
Answer: B
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An ideal incompressible fluid flows at 12 m/s in a horizontal pipe. If the pipe widens to twice its original radius, what is the flow speed in the wider section?
A) 12 m/s B) 6.0 m/s C) 4.0 m/s D) 3.0 m/s
A violation of the second law of thermodynamics would occur if
A. a ball lying on the ground spontaneously moved to the top of a desk. B. an object with low temperature transferred energy in the form of heat to an object with a higher temperature. C. a motion picture was run backwards through the projector. D. any of the above occurred. E. (a) or (b) occurred, but not (c).
Imagine a steel pipe that doesn't leak from the sides and is already filled with water. Water enters at a rate of 2 kg/s but leaves at a rate of 1 kg/s. Which of the following is true?
A. The water pressure inside the tube rises as water is added B. The water flow must be laminar C. The tube is narrower where the water enters than where it leaves D. It is not possible for this situation to occur
A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
A) 0.350 B) 0.650 C) zero D) 0.200 E) The answer depends on which edge of the board is vertical.