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When a light bulb is connected across the terminals of a battery, the battery delivers 20 W ofpower to the bulb. A voltage of 12.8 Vexists between the terminals of the battery, which has an internalresistance of 0.14 Ω. What is the emf of the battery?
find the angle counterclockwise relative to the horizontal.
A spherically symmetric electromagnetic wave is emitted by a 1030 W source. What is the rms value of the electric field at that distance
You have designed a new musical instrument of very simple construction. Your design consists of a metal tube with length L and diameter L/10. What must be the tension of the string to produce the desired effect
Assume L1 = 0.844 m and L2 = 0.401 m. Calculate the normal force exerted by the floor on each hand
As a woman walks, her entire weight is momentarily placed on one heel of her high-heeled shoes. Calculate the pressure exerted on the floor by the heel
Consider a model of a hydrogen atom in which an electron is in a circular orbit of radius = 5.79×10?11 around a stationary proton. What is the speed of the electron in its orbit?
The energy for the 5P valence electron in indium (Z=49) is -5.79 electron volts. What is the effective nuclear charge experienced by this electron
A 3.0 kg mud ball drops from rest at a height of 10 m. what is the average net force exerted by the ball
What is the effect of thermal insulation on cooling
For two concentric conducting rings the inner of the large ring in 12 cm and the outer radius of the smaller ring is 4 cm, Calculate the electric potential half way between the two rings 8 cm away from the center of the rings
Two ice skaters, Daniel (mass 65.0 kg) and Rebecca (mass 45.0kg), are practicing, What are the magnitude and direction of Daniel's velocity after the collision
The press box at a baseball park is 40.0 above the ground. find the horizontal distance from the press box to second base
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