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A boy in a wheelchair (total mass 51.0 kg) has speed 1.40 m/s at the crest of a slope 2.40 m high and 12.4 m long. At the bottom of the slope his speed is 6.10 m/s. Assume air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N. Find the work he did in pushing forward on his wheels during the downhill ride.
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The angle of incidence of a light beam in air onto a reflecting surface is continuously variable. What is the index of refraction of the reflecting material
A basketball player jumps straight up and then lands 0.49 seconds after leaving the ground. Find the initial velocity of the player
Point charges located at 3, 8, and 11 cm along the x - axis are represented in the figure (at 3cm +q, 8cm -2q, 11cm +q). What is the magnitude of the force on the charge
find the x and y components of the shell.
A 65.0 kg object slides down a 30o angle slope from rest at a height of 15.0 m. The coefficient of kinetic friction between the object and the slope surface is 0.15. What is the object's speed at the bottom of the slope
A child runs down a 10 degree hill and then suddenly jumps upward at a 17 degree angle above horizontal and lands 1.5 m down the hill as measured along the hill. what was the initial speed?
a rod of length L lies along the x-axis between x=A and x=A+L. The rod has a non-uniform charge density, What is the magnitude of the electric field at the origin
A flywheel of mass 185 kg has an effective radius of 0.62 m (assume the mass is concentrated along a circumference located at the effective radius of the flywheel)
A tungsten wire in a vacuum has length 15.0cm and radius 1.00mm. A potential difference is applied across it. What voltage drop is required across the wire
Halley's comment moves in an elliptical orbit around the sun with eccentricity e=0.967. Its distance from the sun at perihelion is rmin=8.9 x 10^7 km. Calculate the orbital period of Halley's comet
The tortoise can run with a speed of 0.1 m/s and the hare can run with a speed of 2 m/s. They start their race at the same time, but the hare, feeling confident, stops along the way for a two minute nap, and the tortoise wins by the length of his ..
Find the electric energy density between the plates of a 225- parallel-plate capacitor. The potential difference between the plates is 360
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