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Two cylindrical bars, each with diameter of 2.00 cm, are welded together end-to-end. One of the original bars is copper (resistivity 1.72e-8 ohm*m) and is 0.320 m long. The other bar is nichrome (resistivity 100.00e-8 ohm*m) and is 0.125 m long. What is the resistance among the ends of the welded bar at 20oC?
A 3.7 kg block of copper at a temperature of 86°C is dropped into a bucket containing a mixture of ice and water whose total mass is 1.2 kg. How much ice was in the bucket before the copper block was placed in it
A parallel-plate capacitor is connected to a battery and stores 4.7nC of charge. Then, while the battery remains connected, a sheet of Teflon is inserted among the plates. By how much does the charge change?
Find out the critical angle theta_ce for e-waves in calcite. The index of refraction for light with electric field parallel to the optical axis (called extraordinary waves or e-waves) is 1.4864. The index of refraction for light with electric fiel..
Dinoflagellates are single-cell creatures that float in the world's oceans; many types are bioluminescent. When disturbed by motion in the water, What is the power of the flash in watts
Gas is contained in an 6.4 L vessel at a temperature of 20°C and a pressure of 8.2 atm. Determine the number of moles of gas in the vessel
A skier (m = 63.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. Find the skier's total kinetic energy as she reaches the ground
A rectangular loop of wire with sides 0.23 and 0.39 m lies in a plane perpendicular to a constant magnetic field, compute magnitude of the average emf induced in the loop.
A ski starts from rest and slides down a 28 degree incline 70m long. If the coefficient of friction is 0.090, what is the ski's speed at the base of the incline
a 5.5 kg bucket of water is raised from a well by a rope. the acceleration of gravity is 9.81 ms2 . if the upward
A uniform solid sphere has a moment of inertia I about an axis tangent to its surface. The moment of inertia of this sphere about an axis through its
The angular momentum of a flywheel having a rotational inertia of 0.148 kg·m^2 about its central axis decreases from 6.70 to 0.560 kg·m^2/s in 3.50 s. How much work is done on the wheel
q1. sunlight enters a room at an angle of 31 above the horizontal and reflects from a small mirror lying flat on the
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