A rear window defroster consists of a long, flat wire bonded to the inside surface of the window. When current passes through the wire, it heats up and melts ice and snow on the window. For one window the wire has a total length of 12.0 m, a width of 1.8 mm, and a thickness of 0.12 mm. The wire is connected to the car's 12.0 V battery and draws 12.0 A. What is the resistivity of the wire material?

Explanation:

Given:

width of the wire,

thickness of the flat wire,

length of the wire,

voltage across the wire,

current through the wire,

Now the net resistance of the wire:

using ohm's law

We have the relation between the resistivity and the resistance as:

where:

a = cross sectional area of the wire

resistivity of the wire material

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation: