Q: A firehose must be able to shoot water to the top of
A firehose must be able to shoot water to the top of a building 28.0 m tall when aimed straight up. Water enters this hose at a steady rate of 0.500 m3/s and shoots out of a round nozzle. (a) What is...
See AnswerQ: In seawater, a life preserver with a volume of 0.
In seawater, a life preserver with a volume of 0.0400 m3 will support a 75.0-kg person (average density 980 kg / m3), with 20% of the person’s volume above the water surface when the life preserver is...
See AnswerQ: A closed and elevated vertical cylindrical tank with diameter 2.00
A closed and elevated vertical cylindrical tank with diameter 2.00 m contains water to a depth of 0.800 m. A worker accidently pokes a circular hole with diameter 0.0200 m in the bottom of the tank. A...
See AnswerQ: Serious bicyclists say that if you reduce the weight of a bike
Serious bicyclists say that if you reduce the weight of a bike, it is more effective if you do so in the wheels rather than in the frame. Why would reducing weight in the wheels make it easier on the...
See AnswerQ: A bullet spins on its axis as it emerges from a rifle
A bullet spins on its axis as it emerges from a rifle. Explain how this prevents the bullet from tumbling and keeps the streamlined end pointed forward.
See AnswerQ: Block A in Fig. P12.72 hangs by a cord
Block A in Fig. P12.72 hangs by a cord from spring balance D and is submerged in a liquid C contained in beaker B. The mass of the beaker is 1.00 kg; the mass of the liquid is 1.80 kg. Balance D reads...
See AnswerQ: A plastic ball has radius 12.0 cm and floats in
A plastic ball has radius 12.0 cm and floats in water with 24.0% of its volume submerged. (a) What force must you apply to the ball to hold it at rest totally below the surface of the water? (b) If yo...
See AnswerQ: Assume that crude oil from a supertanker has density 750 kg/
Assume that crude oil from a supertanker has density 750 kg/m3. The tanker runs aground on a sandbar. To refloat the tanker, its oil cargo is pumped out into steel barrels, each of which has a mass of...
See AnswerQ: A barge is in a rectangular lock on a freshwater river.
A barge is in a rectangular lock on a freshwater river. The lock is 60.0 m long and 20.0 m wide, and the steel doors on each end are closed. With the barge floating in the lock, a 2.50 × 106 N load of...
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