Acertain laboratory experiment requires an aluminum wire of length of 39.0 m and a resistance of 2.10 ω at 20.0°c. what diameter wire must be used? (the resistivity of aluminum at 20.0°c is 2.82 10-8 ω · m.)

817.02 x 10⁻⁶ m

Explanation:

L = length of the aluminum wire = 39.0 m

R = Resistance of the wire = 2.10 Ω

ρ = Resistivity of aluminum wire = 2.82 x 10⁻⁸ Ω·m

A = area of cross-section of wire

Resistance of the wire is given as

A = 5.24 x 10⁻⁷ m²

d = diameter of the wire

Area of cross-section of wire is given as

A = (0.25) πd²

5.24 x 10⁻⁷ = (0.25) (3.14) d²

d = 817.02 x 10⁻⁶ m

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

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explanation: