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The rain-soaked shoes of a person might explode if ground current from nearby lightning vaporizes the water. The sudden conversion of water to water vapor causes a dramatic expansion that can rip apart shoes. Water has density 1000 kg/m^3 and requires 333 kJ/kg to be vaporized. If horizontal current lasts 2.00 ms and encounters water with resistivity 150 Ωm, length 12.0 cm, and vertical cross-sectional area 15 x 10^-5 m2, what average current is needed to vaporize the water?
A uniform electric field of magnitude 405 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 2.60 cm. What is the work done by the field on the electron?
A gas cylinder with a tight-fitting, movable piston contains 200 cm3 of air at 1.0 atm. What is the volume of gas at this depth
A fiber optic audio system consists of an input, a playback head that has a transfer function of .7, an amplifier with a gain of 6 and a speaker system with a transfer function of .4. Evaluate the output for an input of 0.08V
a piece of copper wire has a resistance per unit length of 5.50 10-3 ?m. the wire is wound into a thin flat coil of
A uniform plank of length 5.70 m and weight 215 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 452 N walk on the overhanging part of the plank before it just be..
A 205-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp isinclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is0.900, and the log has..
A singly charged positive ion has a mass of 2.53 10-26 kg. After being accelerated through a potential difference of 270 V, the ion enters a magnetic field of 0.590 T, Calculate the radius of the path of the ion in the field
Give examples of four states of matter. Discuss how gravity affects weight and density. Why is the mass density more important than weight density?
On a part-time job, you are asked to bring a cylindrical iron rod of density 7800kg/m3, Calculate the weight of the rod, w
An archer shoots an arrow toward a 300-g target that is sliding in her direction at a speed of 2.20 m/s on a smooth, What is the speed of the arrow after passing through the target
A futuristic design for a car is to have a large disk -like flywheel within the car storing kinetic energy. find the maximum attainable speed of the car
imagine a hole is drilled down to the center of the earth. a small mass m is dropped into the hole. find the speed of the mass just as it reaches the earth's center
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