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The rotor of an electric motor has a mass of 25 kg and a radius of gyration of 180 mm. It is observed that 4.2 min is required for the rotor to coast to rest from an angular velocity of 3600 rpm. Determine the average magnitude of the couple due to kinetic friction in the bearings of the motor.
Calculate a combined plane change for the second Hohmann burn from our problem.Add that to the first Hohmann burn to find the total ?V.
A transformer connected to a 100 V (rms) ac line is to supply 8.0 V (rms) to a portable electronic device. What rms current must the secondary supply
A 530kg cannon fires a 11kg cannonball with a speed of 200m/srelative to the muzzle, When the cannon fires, what is the speed of the cannonball relative to the earth
Doug uses a 29 horizontal force to push a 3.5 crate up a 1.5 -high, 20 frictionless slope. What is the speed of the crate at the top of the slope
A fixed 0.15 kg solid-disk pulley with a radius of 0.060 m is acted on by a net torque of 5.4 m�·N. What is the angular acceleration of the pulley
what is the magnitude of the force experienced by a proton
A proton is released from rest at the positive plate of a parallel-plate capacitor, What will be the proton's final speed if the experiment is repeated with double the amount of charge in each capacitor plate
Fromt= 0 tot= 4.39 min, a man stands still, and fromt= 4.39 mintot= 8.78 min, he walks briskly in a straight line at a constant speed of2.01 m/s. What are(a)his average velocityvavgand(b)his average accelerationaavgin the time interval 1.00 min to5.3..
A person wants to determine the spring constant of an exercise stretch cord. He pulls the cord with a force probe that exerts a 45-N force on the cord, causing it to stretch 20cm. Using the Hooke's law find the spring constant of the cord. Assume ..
At a certain location, the horizontal component of the earth's magnetic field is 2.5 x 10^-5 T due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its weight. Fine the speed of the proton.
A light ray in air is incident on a piece of crown glass (n=1.5) at an angle of 37 degrees from the vertical. At what angle to the vertical is the ray transmitted into the glass
A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. what impulse did he imply on the ball
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