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An 80-centimeter long wire is made by welding a 2.30 millimeter diameter, 20-centimeter long copper wire to a 2.30 millimeter diameter, 60-centimeter long iron wire. Determine what is the resistance of the composite wire?
A 57.0-g tennis ball is traveling straight at a player at 21.0 m/s. The player volleys the ball straight back at 25.0 m/s. what average force acts on the ball
a person notices a mild shock if the current along a path through the thumb and index finger exceeds 80 microa. compare
A rock of mass 0.19 kg falls from restfrom a height of 12 m into a pail containing 0.30 kg of water. Therock and water have the same initial temperature. The specific heatcapacity of the rock is 1820 J/(kg·C°).
A 18.4 kg cart traveling at 5.63 m/s (this movement defines thepositive direction) has a head on perfectly inelastic collision with a 6.9 kg cart traveling at 7.06 m/s. How much kineticenergy is lost in the collision?
Calculate the total cost ($/kWh) of electricity delivered to the grid including fuel cost and debt charge with O&M of 5% added to the total.
A sanding disk with rotational inertia I is attached to an electric drill whose motor delivers a torque of magnitude? calculate the angular velocity of the disk
space vehicles traveling through earths radiation belts can intercept a significant number of electrons. the resulting
For your diffraction grating experiment, you need to compute the wavelength of light. Derive the expression for calculating the wavelength () in terms of y1bright. Given the ratio of d to D is 1:300 and also the angle 1 is 4°.
A strip of paper is pulled along at 20m/s at a right angle to the plane of a .49m long pendulum. The pendulum has a small ink jet device to the bob so that it marks the position of the pendulum on the paper. The bob is held 8.0cm to one side and rele..
A man is trying to get his car out of mud on the shoulder of a road. He ties one end of a rope tightly around the front bumper and the other end tightly around a utility pole a distance d away. What is the magnitude of the force on the car from the..
A proton is initially at rest at a point where the potential is 455V. Sometime later the proton is at a point where the potential is 191V. If no force but the electrostatic force acts on the proton, what is its final kinetic energy.
A 1051 kg coasts down a hill 40 m high with its engine off and the driver's foot pressing the brake pedal. How much energy was converted into heat on the way down
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