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A boy in a wheelchair (total mass 45.0kg) wins a race with a skateboarder. He has speed 1.40 m/s at thecrest of a slope 2.00 m high and 12.4m long. At the bottom of the slope his speed is 6.40 m/s. If air resistance and rolling resistancecan be modeled as a constant friction force of 41.0 N, find thework he did in pushing forward on his wheels during the downhillride.
q1. revolutionary war cannon with a mass of 2220 kg fires a 22.7 kg ball horizontally. the cannonball has a speed of
An electron is confined to a box the size of a small atom, 0.12nm across. ?p, What wavelength photon would have the same energy
The exhaust fan on a typical kitchen stove pulls 600 CFM (cubic feet per minute) through the filter. how many cubic meters per second does this fan pull
On a very warm day(30C) you are sitting at the shallow end of a swimming pool teaching a young child to swim. How long is the pool
The beam from a diode laser is used to investigate the refraction of a piece of plastic. Determine the wavelength of the light in the plastic in nanometers (nm).
A cart of mass 6.8 kg is moving with a velocity of 15.2 m/s. It makes a head-on perfectly inelastic collision with a stationary cart B with mass 6.4 kg causing them to travel with the velocity 7.63 m/s. What is the velocity of cart B.
A water pipe having a 2.9 cm inside diameter carries water into the basement of a house at a speed of 0.87 m/s and a pressure of 174 kPa, What is the speed and water pressure at the second floor
two blocks are connected over a pulley. The mass of block A is 7.9 kg and the coefficient of kinetic friction between A and the incline is 0.24. What is the mass of block B
consider a hot-air balloon. the deflated balloon gondola and 2 passengers have a combined mass of 315 kg. when inflated
An unmarked police car travelling a constant 95 km/h is passed by a speeder travelling 145km/h. Precisely 1 s after the speeder passes, the police officer steps on the accelerator.
A spherical mirror is polished on both sides. When the convex side is used as a mirror, the magnification is +1/4. What is the magnification when the concave side is used as the mirror, the object remaining the same distance from the mirror.
A bus contains a 1440 kg flywheel ( a disk that has a 0.670 m radius ) and has a total mass of 9400 kg. Calculate the angular velocity of the flywheel
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