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A boy in a wheelchair (total mass 47.0 kilogram) wins a race with a skateboarder. He has speed 1.40 m/s at the crest of a slope 2.60 meter high and 12.4 meter long. At the bottom of the slope his speed is 6.20 m/s. If air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, Compute the work he did in pushing forward on his wheels during the downhill ride.
A student sits on a rotating stool holding two 3.5 kg objects. When his arms are extended horizontally, Find the kinetic energy of the student before and after the objects are pulled in
Consider n moles of an ideal monatomic gas placed in a vertical cylinder. The top of the cylinder is closed by a piston of mass M and cross-section A. Initially the piston is fixed, and the gas has temperature T0 and volume V0.
A 5 kg ball strikes a massive wall at 11 m/s at an angle of ?=65.0° with the plane of the wall. It bounces off the wall with the same speed and angle. what is the average force exerted by the wall on the ball in y direction
question when an electroscope is charged its two leaves repel each other and remain at an angle. what balances the
A photon with energy 0.50 eV is barely capable of causing a photoelectric effect when it strikes a metal plate. Find the speed of the released electron far from the nucleus
An object is placed 13.1 cm to the left of a diverging lens of focal length -6.04 cm. Find the distance d that places the final image at infinity
A 0.00893-kg bullet is fired straight up at a falling wooden block that has a mass of 1.80 kg. The bullet has a speed of 551 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for..
High-intensity desk lamps are rated at 30 W but require only 13 V. They contain a transformer that converts 125 V household voltage. What is the current in the secondary when the lamp is on?
Find out the maximum height reached by the athlete relative to the trampoline also f ind out the speed of the athlete when she is halfway up to her maximum height
A small spherical insulator of mass 6.75 x 10-2 kgand charge +0.600 μC is hung by a thin wire of negligiblemass. A charge of -0.900 μC is held 0.150 m away from the sphere and directly to the right of it, so the wire makes anangle with the vertica..
If this same monchromatic light where to strike the grating when it is immersed in carbon disulfide with a refractive index of 1.63, at what angle would the first order diffraction appear
A long solenoid (diameter = 4.00 cm) is wound with 1500 turns per meter of thin wire through which a current of .220 A is maintained. A wire carrying 5.00 A is inserted along the axis of the solenoid.
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