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A simple heater for a cup of water consists of an insulated resistive coil that plugs directly into a 120 V electrical outlet. The heater is placed into a coffee mug that contains 0.550 kg of water and heats it to boiling (100°C) from room temperature (20°C) in 180 s. If the specific heat of the water is 4200 J/kg·K over this temperature range, what is the resistance of the coil? Ignore any changes in the resistance of the coil due to the increase in temperature.
A positive point charge q is fixed in position at the center of a square. A second point charge is fixed to corner B, C, or D. At which corner is the second charge located
The skis have a thrust of 220 . Sam's speed at the bottom is 45.0. Illustrate what is the coefficient of kinetic friction of his skis on snow?
A point charge of +Q is placed at the center of a square, and asecond point charge of -Q is placed at the upper-left corner. It is observed that anelectrostatic force of 2.0 N acts on the positive charge at the center.
a 0.50 t magnetic field is perpendicular to a circular loop of wire with 53 turns and a radius of 15 cm. if the
In a 30.0-s interval, 450 hailstones strike a glass window of area 0.600 m2 at an angle of 45.0° to the window surface. Find the average force on the window
A car is traveling at 25 m/s when the brakes are applied and it comes to rest after 5 s. How far did it travel while the brakes were applied
assume that the electron is a sphere of radius 10 to the power -17 meters and physically spins about an arbitrary axis.
Two astronauts are 1.40 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. How far away from the earth is the spaceship
Object O1 is 14.7 cm to the left of a converging lens with a 10.8-cm focal length. What is the overall magnification of this system
A child pulls a friend in a little red wagon with constant speed. If the child pulls with a force of 16 N for 10.0 m, how much work does the child do on the wagon
Two flexible balls rolling along a frictionless horizontal surface collide with each other. The Larger of the balls weighs 50g and the smaller weighs 30g. find the acceleration of the center of mass of the smaller ball
A 45.7-g golf ball is driven from the tee with an initial speed of 50.1 m/s and rises to a height of 23.3 m. determine the kinetic energy of the ball at its highest point
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