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Two students together exert a force of 825 N in pushing a car 35 m.
1. How much work do they do on the car?
2. If the force were doubled, how much work would they do pushing the car the same distance?
on an essentially frictionless horizontal ice rink a skater moving at 4.0 ms encounters a rough patch that reduces her
A Porsche 944 Turbo has a rated engine power of 217hp . 30% of the power is lost in the drive train, and 70% reaches the wheels. What is the maximum acceleration of the Porsche on a concrete surface where
A room has a volume of 128 m3. An air-conditioning system is to replace the air in this room every twenty-three minutes, find the length of a side of the square
A jackhammer causes a sound intensity of 95 bB at a point where a person is standing. What is the sound intensity level at the position of the listener
The record speed for a tennis ball served is 73.14 m/s. determine what was the average force exerted on the tennis ball during this record serve
Two astronauts, each having a mass M, are linked by a rope of length d having negligible mass. They are isolated in space, orbiting their center of mass at speeds v.
How long would it take a 750W electric heating plate to bring one liter of water to boil from 20 degrees celcius? If energy costs $0.15/kWhr, how much does it cost to boil the water?
Express the power in terms of some or all of the variables given in the problem introduction.
Light of wavelength 0.514 µm (in air) enters the water in a swimming pool. The speed of light in water is 0.710 times the speed in air. What is the wavelength of the light in water
A standing observer perceives a train whistle to have a frequency of 300 Hz. what is the frequency of the sound waves emitted from the train
A Venturi meter measures fluid speed in a pipe. A constriction (of cross-sectional area A2) is put in a pipe of normal cross-sectional area A1 (A1 = 2A2). Find the ratio of the flow speeds
A stationary detector sends out a sound wave of frequency0.305 MHZ toward an approaching car. The speed of the car is 40m/s. What is the frequency of the waves reflected back to the detector
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