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Power transmission lines generally operate at high voltage and low current. Why?
If the car exerts a constant braking force, How much longer will the stopping distance be if the car begins with a velocity of 20.0 m/s compared to a velocity of 10.0m/s.
A communications satellite with a mass of 180 kg is in a circular orbit about the Earth. What is the gravitational force exerted on the satellite by the Earth when in orbit
A 12 kg- hammer strikes a nail at a velocity of 8.5m/s and comes to rest in a time interval of 7.7 m/s. What is the average force acting on the nail
A metal ball bearing 1.0 cm above the bead feels a 0.035 N downward electric force, What is the charge on the ball bearing
A light cord is wrapped around the rim on the disk and then tied to a small can of mass m = 50 gm. The cord does not slip as it unwinds on the disk. When released the can moves down with acceleration 3.27 m/s2. Take g = 9.81 m/s2. What is the angu..
A charge of 910 C was passed through a wire in 3.10min. What was the average electric current during that interval
The weight of an object at the surface of a planet isporportional to the plants mass and inversely porportional to thesquare of the radius of the plane, How much would it weigh on Jupiter
A ray in air is incident on a glass plate whose index of refraction is 1.42, the angle of incidence is 30°. What is the angle of refraction
a steady horizontal force f of magnitude 21 n is applied at the axle of a solid disk as shown. the disk has mass 2.0 kg
Light is diffracted when it passes through a narrow single slit. What happens to the width of the central maximum in the diffraction pattern when the width of the slit trough which light passes is reduced.
A 400 g baseball thrown by a velocity of 40 m/s is hit straight back at the pitcher with a velocity of -50m/s. What is the change in momentum of the ball? What is the impulse exerted on the ball with the bat?
The platform has a radius of 5 meters and at time=0, the angular velocity is rad/s and the angular acceleration is 0.5 rad/s. determine the velocity and the acceleration
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