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The rain-soaked shoes of a person may 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/m3 and requires 2256 kJ/kg to be vaporized. If horizontal current lasts 2.00 ms and encounters water with resistivity 120 ·m, length 12.0 cm, and vertical cross-sectional area 1.3 10-4 m2, what average current is required to vaporize the water?
A 1-cm-thick layer of water stands on a horizontal slab of glass. After entering the glass, what is the ray's angle from the normal
A wheel starts from rest and rotates about its axis with constant angular acceleration. What is the angular acceleration of the wheel
A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a mile), What is its average power output in watts and horsepower
A 3.00-m-long, 400 kg steel beam extends horizontally from the point where it has been bolted to framework of a new building under construction. A 74 kg construction worker stands at the far end of the beam.What is the magnitude of the torque abo..
A toy cork gun contains a spring whose spring constant is 10.02 N/m. The spring is compressed 5.0 cm and then used to propel a 6.00 g cork. The cork, however, sticks to the spring for 1 cm beyond its unstretched length before separation occurs. The m..
the plane of a flat, circular loop of wire is vertical. An external B-field is directed perpendicular to the plane of the loop. What is the direction of the external magnetic field
A uniform rod of mass 1.5kg and Length=0.18m rotates clockwise on the plane of your paper at an initial rate of 40rev/s about its central axis. Determine the initial angular momentum of the rod
A woman can read the large print in a newspaper only when it is at a distance of 66 cm or more from her eyes. What should be the refractive power (in diopters) of her glasses
find the velocity and position of the particle asthe moment it reaches it's maximum x coordinate.
A Step-Up transformer with 60 Hz AC power has an input voltage of 1000 V at a current of 2 Amperes, What is the current flowing out of the transformer
If the accelerating plates are 1.60 apart, and have a potential difference of 2.60×10^4, what is the magnitude of the uniform electric field between them.
While looking through the Mt. Palomar telescope, you discover a large planetary object orbited by a single moon. calculate the density of Planet Hephaestus
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