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(A) A 120 V potential difference is applied to a space heater whose resistance is 19 ? when hot. At what rate is electrical energy transferred to heat?
(B) At 4.7cents/k W/h, what does it cost to operate the device for 16.0h? (Enter dollars with no unit)
Two protons (each with rest mass M=1.67×10?27kg) are initially moving with equal speeds in opposite directions. What is the kinetic energy of each proton
A 2.4kg object is moving along the x-axis at 1.55m/s. As it passes the origin, two forces F1 and F2 are applied, both in the y direction (plus or minus).
The starter motor of a car engine draws an electric current of 42.0 A from the battery. The copper wire to the motor is 6.00 mm in diameter and 1.71 m long, What is the current density in the wire
A playground merry-go-round has a radius of 4.60 {rm m} and a moment of inertia of 250 kg m^2 and turns with negligible friction about the vertical axle through its center.
The third floor of a house is 7.00 m above street level. How much work is necessary to move a 143kg refrigerator to the third floor.
A 36.0 µF capacitor is connected to a 49.0 omegacap.gif resistor and a generator whose rms output is 30.0 V at 60.0 Hz. find The rms voltage drop across the resistor.
Will is attempting to swim to a dock directly across a river from his current position. In what direction should he swim relative to his intended path
a mass M is hanging from two strings. There is a tension of 34 N in the string on the left and a tension of 24 N in the string on the right. How heavy is the object
In order to clearly read a book 24 cm away, a farsighted girl needs an image to be 35 cm from her eyes. What focal length is necessary for lens in her eyeglasses.
if 5 capacitors each of 5 micro F are connected in series with 4 capacitors each of 4 uF capacitances in parallel. what is the the net capacitance
If air drag is negligibly small, how fast is sequoia cone moving while it reaches the ground if it dropped from the top of a 114 tree.
A 0.450-kg ball is dropped from rest at a point 1.30-m above floor. The ball rebounds straight upward to a height of 0.700-m. What are the magnitude and direction of the impulse of the net force applied to the ball throughout the collision with th..
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