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My car has rear defrosters that are made of 13 wires embedded into the rear window. They can melt a thin layer of ice, roughly 2.25*10^-2 kg worth, in two minutes. These wires are all in parallel and are connected to the 12V battery of my car. Each is about 1.25 m long probably has a resistivity around 90*10^-8 (Omega*m). What is the cross-sectional area of each wire?
A 1.5m -long barbell has a 22kg weight on its left end and a 35kg weight on its right end. If you ignore the weight of the bar itself, how far from the left end of the barbell is the center of gravity
If the power output of a 630 kHz radio station is 50.0 kW, how many photons per second are produced
A stone has a mass of 6.00 x10-3 kg and is wedged into the tread of an automobile tire. The coefficient of static friction between the stone and each side of the tread channel is 0.84.
An extension cord made of two wires of diameter 0.129cm (no. 16 copper wire) and of length 2.2m is connected to an electric heater which draws 17.0 A on a 120V- line, How much power is dissipated in the cord
A cannon, placed in the valley, fires a shell at 52 degrees with respect to the horizontal line. The initial speed of the shell is 516 m/s, Calculate the range of the shell
Assuming that the bricks are lifted with constant speed, illustrate what is the minimum power the motor must produce?
A bismuth target is struck by electrons, and x-rays are emitted, Estimate the M- to L-shell transitional energy for bismuth when an electron falls from the M shell to the L shell
A racing car of mass 950 kg accelerates from rest with an acceleration of 3.9 m/s^2 for 7.5 s. What is the net work done by the car
Suppose one gallon of gasoline produces 1.09×108 J of energy, and this energy is sufficient to operate a car for 21.7 miles. how many miles could the car go on a single tablet
An electron is confined to a box the size of a small atom, 0.12nm across. ?p, What wavelength photon would have the same energy
A child is trying to throw a ball over a fence. She gives the ball an initial speed of 8.0 m/s at an angle of 40° above the horizontal. How far is the child from the fence
The puck has a mass of 0.140kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 70cm/s. The string is pulled downward 15cm by the hole in the frictionless table. Determine the work completed on the puck.
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