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A toaster rated at 1 050 W operates on a 120-V household circuit and has a 4.00-m length of nichrome wire as its heating element. The operating temperature of this element is 320°C. What is the cross-sectional area of the wire?
A violin string tuned to 485.0 Hz is found to exhibit 3.8 beats per second with a guitar string. What was the original frequency of the guitar string
The average magnetic energy density of an electromagnetic wave is 8.95 x 10-5 J/m3. Obtain the magnetic field component of this wave
The battery of a pocket calculator has a voltage of 4.0 V and devilers a current of 0.29 mA. In one hour of operation How much charge flows in the circuit
A heat engine does 7210 J of work in all cycle while absorbing12.2 kcal of heat from a high-temperature reservoir. What is the efficiency (in percent) of this engine?
A diatomic molecule is excited to its first rotational energy level, corresponding to J = 1. what is the angular speed of the molecule about its center of mass
Calculate torques about an axis
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 14.0cm , giving it a charge of -11.0μC. Find the electric field just outside the paint layer
a 2 kg block resting on a frictionless surface is attached to a spring k 700nm . a 1 kg block slides along the surface
A boy rolls a ball on a level floor 3.5 meter to another boy. If the ball makes 15.0 revolutions, evaluate what is its diameter
you are driving along a highway at 28.7 ms when you hear a siren. you look in the rear-view mirror and see a police car
Two negative point charges are separated by 16 and feel a mutual repulsive force of 1.55. The charge of one is three times that of other.
A sign for the local cheese shop is hung by two strings of length 0.25 meters at either end from a 4 meter long pole with a mass of 200 kg. what is the coefficient of static friction between the wall and the pole
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