When a shower is turned on, the shower curtain moves towards the water spray. This partly involves

A) capillary action.
B) surface tension.
C) pressure changes in moving fluids.
D) none of the above


Answer: C

Physics & Space Science

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A 100-newton sack of potatoes falls from an airplane. As velocity of fall increases, air resistance also increases, and when air resistance equals 100 N, the acceleration of the sack is

1) zero 2) 5 m/s2 3) 10 m/s2 4) 100 m/s2 and the velocity of the sack will be 5) 0 m/s. 6) 5 m/s. 7) 10 m/s. 8) 100 m/s. 9) constant.

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Pulsars' rotations are believed to slow down because

a. they are losing angular momentum into space via outward streaming particles b. they are dragging companions stars around in their magnetic field. c. they are getting tired d. of conservation of angular momentum. e. their mass is increasing.

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Saturn's rings are composed of icy particles

a. True b. False Indicate whether the statement is true or false

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A quark can have a charge of

A) -3/2 e. B) -e/2. C) -1/3 e. D) -e/4. E) -3/4 e.

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