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A box of mass 275 kg slides 4.0 m down an inclined plane of 30°. Jim pushes against the box to keep it from accelerating. The coefficient of kinetic friction between the box and the ramp is 0.32
(a) Calculate the magnitude of the force exerted by Jim. in N
(b) Calculate the work done by Jim on the box. in joules
(c) Calculate the work done by the force of friction. in joules
(d) What is the work done by the force of gravity? in joules
(e) What is the net work done on the box? in joules
A battery having an emf of 9.80 V delivers 109 mA when connected to a 60.0 load. Determine the internal resistance of the battery
A bismuth target is struck by electrons, and x-rays are emitted, Estimate the M- to L-shell transitional energy for bismuth when an electron falls from the M shell to the L shell
questiona capacitor is constructed from 2 square metallic plates of sidersquos scripted l and separation d. charges q
A tungsten wire has a radius of 0.082 mm and is heated from 20.0 to 1399 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1. How long is the wire
whose third coordinate is the vertical displacement between the planes. Consider east to be the positive x axis and north to be the positive y axis.
Does current through a power supply increase when parallel bulbs are added? what is the current through the power source
An x-ray tube accelerates electrons from rest at 5.0×10 14th m/s(squared) power through a distance of 20cm. Find the acceleration time
While rearranging a dorm room, a student does 276 J of work in moving a desk 1.7 m. What was the magnitude of applied horizontal force.
Suppose we rely upon friction between the wall and the rod to hold up the sign (there is no hinge attaching the rod to the wall). What is the smallest value of the coefficient of friction
A parallel-plate capacitor is formed from two 3.60cm × 3.60cm electrodes spaced 2.70mm apart, What is the charge (in nC) on each electrode
A bicycle is turned upside down while its owner repairs a flat tire on the rear wheel. determine the magnitude of the average angular acceleration of the wheel
Batteries are rated in terms of ampere-hours (A · h). For example, a battery that can produce a current of 3.00 A for 5.00 h is rated at 15.00 A · h. what is the value of the electricity produced by this battery
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