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The primary coil of a step-up transformer is connected across the terminals of a standard wall socket, and resistor 1 with a resistnace R1 is connected across the secondary coil. The current in the resistor is then measured. Next, resistor 2 with a resistance R2 is connected directly across the terminals of the wall socket (without the transformer). The current in this resistor is also measured and found to be the same as the current in resistor 1. How does the resistance R2 compare to the resistance R1?
A convex lens is held over a piece of paper outdoors on asunny day. When the paper is held 26 {\rm cm} below the lens, the sunlight is focused on the paper and the paperignites. What is the focal length of the lens?
The rope makes an angle of 70.0 degrees with respect to the vertical as shown. Illustrate what is the tangential speed of the ball?
A certain Carnot engine produces 200 J of work per cycle, what is the change in entropy of the hot reservoir per cycle
A rope connects a 25 kg mass sitting on a 30 degree incline with a hanging mass of 90 kg, the rope passes over a 12kg disk-shaped pulley that has a radius of 0.250m. When the system is released, the heavier mass descends, the rope turns over the p..
You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 28.4N. What is the density
The impact on light fixture swing
a wheel of radius r is rolling without slipping. the velocity of the point on the rim that is in contact with the
a rod of mass 150 g and 60.0 cm long is suspended by two springs in a 2.50 t magnetic field as shown. the weight of the
A high-diver of mass 70 kg jumps off a board 10 m above the water. If, 2 s after entering the water his downward motion is stopped, what average upward force did the water exert on him
the rest energy of a particle is 1 mev. when it travels at a speed of v with respect to an observer the kinetic energy
Bowling balls can be made from a vaiety of substances and are required to have a circumference of roughly 27.6 inches. calculate the thickness of the shell
A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 7.0 m/s
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