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Two cylindrical bars, each with diameter of 2.40 cm, are welded together end-to-end. One of the original bars is copper and is 0.350 m long. The other bar is gold and is 0.135 m long. What is the resistance between the ends of the welded bar at 20 oC ?
470 cm3 of water at 82°C is mixed with 95 cm3 of water at 8°C. Calculate the final equilibrium temperature, Calculate the final equilibrium temperature assumning no heat loss after mixing occurs
Two converging lenses, each of focal length 15.1 cm, are placed 40.4 cm apart, and an object is placed 30.0 cm in front of the first lens. What is the magnification of the system
A high-speed sander has a disk 4.00 cm in radius that rotates about its axis at aconstant rate of 1265 rev/min. find the angular speed of the disk in radians per second
The tension in a guitar string is increased by a factor of two. by what factor does the wave velocity change
A system consisting of an ideal gas at the constant pressure of 150kPa gains 810J of heat. Find the change in volume of the system if the internal energy of the gas increases by 490J
Two 40.0 µF capacitors in parallel are connected across a sinusoidal ac generator operating at 60.0 Hz. how much current passes through each capacitor
One afternoon, a couple walks five-sixthsof the way around a circular lake, the radius of which is1.70km. What are the magnitude and direction (relative to due east) ofthe couple's displacement
A 1600 kg car traveling eastward at 32 m/s collides at an intersection with a 700 kg motorcycle traveling northward at 45 m/s. What is the direction of the car's velocity after the collision
A block of wood of mass 2 kg is suspended by long, light strings and is at rest. A bullet of mass 40 g, strikes and remains in the block, causing it to swing. The utmost height of the block above its rest position is 51 cm.
The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At what temperature will the gap be closed
a spherical drop of water carrying a charge of 90pc has a potential of 270 v at its surface, what is the potential in the new drop
A solid disk of radius R, mass 2.39 kg is spinning at angular velocity 60.6 rpm about a vertical axis. What is the mass of the second disk
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