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A heater coil connected to a 240 V ac line has a resistance of 58 .
(a) What is the average power used?
(b) What is the maximum value of the instantaneous power?
(c) What is the minimum value of the instantaneous power?
A 10.0 g bullet is fired into a stationary block of wood (m = 4.95 kg). The bullet imbeds into the block. What was the original speed of the bullet
A 47.7 kg girl is standing on a 127 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the ice surface
The magnetic field in a certain region is 0.128 , and its direction is that of the axis in the figure. What is the magnetic flux across the surface ?
A 3kg model rocket initially at rest experiences an average force of 3950N over a distance of 200 cm. What would tne final altitude be of the rocket
Pulsed lasers used in science and medicine produce very short bursts of electromagnetic energy. If the laser light wavelength is 1062 nm, How many wavelengths are found within the laser pulse
The picture below shows a model of a human leg with a heavy weight on the ankle. It represents a person lying on his back doing leg-lifts to exercise the quadriceps. What is the magnitude of the gravitational torque
Eight books, each 4.9 cm thick with mass 1.2 kg, lie flat on a table. How much work is required to stack them one on top of another.
At the same instant that a 2.0-kg ball is dropped from 50 m above Earth, a second ball, What is the velocity of the center-of-mass of the two-ball system 0.5 seconds after the balls are released
For the spherical distribution: A conducting spherical shell of inner radius b and outer radius c is concentric with a small metal sphere of radius a
A proton (mass 1.67 10 ) is moving at 1.65 10 directly toward a stationary helium nucleus (mass 6.64 10 ). After a head-on elastic collision, what is the proton's velocity?
What is the speed of a 2.6 (kinetic energy) electron? What is the speed of a 2.6 proton?
A particle with charge of 16.1 µC is placed at the center of a spherical shell of radius 29.0 cm. find the total electric flux through the surface of the shell
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