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A motorised gearbox has a reduction ratio of 50:1. The power input to the gearbox is 5 kW at 1440 RPM. The gearbox efficiency is 85% under maximum load conditions. The output shaft of the gearbox is attached to a winch drum of pitch diameter 220 mm and is used to hoist a load. Determine the maximum speed at which a load may be lifted and the maximum load capacity (in tonnes) of the winch. Frictional losses in the winch drum itself may be neglected.
A moving 2.7 kg block collides with ahorizontal spring whose spring constant is 426N/m (see figure). The block compresses the springa maximum distance of 15.0 cm from its rest position. The coefficient of kinetic friction between the block and the..
A section of an advertising sign consists of a long tube full by neon gas having electrodes inside at both ends. A uniform electric field of 20 kN/C is set up between the electrodes, and neon ions accelerate along the length of the tube. Given that t..
An axon is the relativelylong tail-like part of a neuron, or nerve cell. Theoutersurface of theaxon membrane (dielectric constant = 5, thickness = 1 x10-8 m) ischarged positively, and the inner portion is charged negatively.Thus, the membrane is a ki..
four charges are evenly spaced along the x axis with a separation distance d3cm. the values of the charges are q1 2
A neutral (uncharged) capacitor has a charge of -3.00C moved from one of the plates to another in a time of 5.00 sec, leaving +3.00C on 1st plate. The +charges don't move, only the electrons. What was the average current?
An 80kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350N. For the first 12m the floor is frictionless, and for the next 16m the coefficient of kinetic friction is .44. What is the final speed of the crate? ..
Two hockey players are traveling at velocities of v1 = 11 m/s and v2 = -20 m/s when they undergo a head-on collision. What is the mass of the other player
A child playing tee ball hits a stationary 65 g ball with a 200 g bat swinging initially at 4.0 m/s. What's the bat's post-impact speed
A ladder of length 20.0m is carried by a fire truck. The ladder has a weight of 2300N and its center of gravity is at its center. What magnitude must F→ have to just lift the ladder off the support bracket at B?
Light is emitted from an ordinary lightbulb filament in wave-train bursts about 10 ^ -8 s in duration. What is the length in space of such wave trains
It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. Find the magnitude of the bird's acceleration
A 3.00 kg mud ball has a perfectly inelastic collision with a second mud ball that is initially at rest. What is the mass of the second mud ball
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