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Exploding shoes. 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 adramatic expansion that can rip apart shoes. Water has density 1000kg/m3 and requires 2256 kJ/kg to be vaporized. If horizontal current lasts 2.27 ms and encounters water with resistivity 177 Ω·m, length 12.2 cm, and verticalcross-sectional area 15.3 ×10-5 m2, what average current (in A) isrequired to vaporize the water?
A 20.0 kg wood ball hangs from a 1.70 m-long wire. The maximum tension the wire can withstand without breaking is 500 N. What is the largest speed this projectile can have without causing the cable to break
A very long wire is held under tension by suspending weights from an end that passes over a pulley. What is the speed of the traveling speed
The coefficient of performance of a refrigerator is defined as the ratio of heat extracted, At what rate will this refrigerator deliver heat to the room in which it is operating when it is running
On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. What is the rate of increase of the entropy of the universe
A boat is tied to a dock by four ropes. Two ropes, with a tension of 55 N each, are at right angles to the dock. What is the magnitude of the sum of these forces
What is the angular speed of the bar at the moment the bug jumps?
An elastic cord is 65 cm long while a weight of 56 N hangs from it and is 82 cm long while a weight of 84 N hangs from it. What is the spring constant of this elastic cord.
A 5.00 m long rigid beam with a mass of 110.0 kg is supported at each end. How much upward force does each support exert on the beam
A heat engine does 349.21 J of work per cycle while exhausting 507.83 J of heat to the cold reservior. what is the cold reservior temperature in degrees Celsius
A woman of mass m = 50.9 kg sits on the left end of a seesaw-a plank of length L = 3.99 m, Find the normal force exerted by the pivot if the plank has a mass of mpl = 13.4 kg
A projectile is fired in such a way that its horizontal range is equal to 2 times its maximum height. What is the angle of projection
A group of particles is traveling in a magnetic field of unknown magnitude and direction. What is the direction of the magnetic field
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