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 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 2.09 ms and encounters water with resistivity 172 ω·m, length 15.2 cm, and vertical cross-sectional area 16.7 × 10-5 m2, what average current is required to vaporize the water?

I=0.41A

Explanation:

Given,

Density:

Heat vaporization

Then we can calculate the mass

We know that,

Heat vaporization,

Rate of energy transference,

Where

Note that

So,

b.transmitters send radio waves, and receivers capture radio waves.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.