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A 406.0 kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300.0 K. How much heat must the smelter produce to completely melt the copper bar? (The specific heat for copper is 386 J/kg·K, the heat of fusion for copper is 205 kJ/kg, and its melting point is 1357 K.)
Red light (n = 1.520)and violet light (n =1.538) traveling in air are incident on a slab of crown glass. What is the angle ofincidence of the violet light
A system consists of two positive point charges, q1 and q2>q1. The total charge of the system is +62.0 x 10^-6 C, Find q1 and q2
A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. What is the mass of the wheel
A 10-cm-diameter parallel-plate capacitor has a 1.0 mmspacing. What is the magnetic field strength on the axis
A hydrogen atom initially in the ground state absorbs a photon, which excites it to the n = 12.0 state. Determine the frequency of the photon
Two circuits contain an emf produced by a moving metal rod, like that shown in the drawing. If the speed of the rod in circuit 1 were twice that in circuit 2, what would be the ratio P1/P2 of the powers in the circuits
An electric motor rotating a workshop grinding wheel at a rate of 1.09 102 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.50 rad/s2. (a) How long does it take for the grinding wheel to stop? s (b..
There are four coils of wire being used as electromagnets. They all have the equal size and are made up of the same material but have a different number of loops.
Consider the Sun to be at the origin of an xy-coordinate system. What will the asteroid's velocity be at closest approach
A disk of radius R has a uniform surface charge σ on one side. A circular hole of radius R/2 is now cut in the center of the disk. What is the electric field at the center of the hole
How much time has elapsed between the two measurements.
When a golfer tees off, the head of her golf club which has a mass of 280 g is traveling 58 m/s just before it strikes a 46-g golf ball at rest on a tee. determine the speed of the golf ball just after impact
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