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3 years ago

Why do metals conduct electricity while nonmetals do not conduct electricity?

Physics

1 answer:

KATRIN_1 [288]3 years ago

5 0

upper one :

Each metal atom contributes one or more electrons . Note:-free and mobile electrons are responsible for high thermal and electrical conductivity of metals. metals contain lot of free electrons while nonmetals don't have it. metals conduct electricity due to the presence of free electrons which are absent in non-metals.

down one :

metals are good conductors of both heat and electricity, whereas nonmetals generally cannot conduct heat or electricity. ... Metalloids tend to be shiny like metals but brittle like nonmetals. Because they are brittle, they may chip like glass or crumble to a powder if struck.

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Answer:

2.1406 × $10^6$ m/sec

Explanation:

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$qV=\frac{1}{2}mv^2$

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$\frac{1}{2}\times 9.11\times 10^{-31}v^2=1.6\times 10^{-19}\times 13.045=2.1406\times 10^6 m/sec$

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3 years ago

Mechanical energy is the sum of kinetic and potential energy in an object. It is energy in an object due to its motion, position

german

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Answer:

An example of kinetic energy is a car coming to a stop

Explanation:

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4 years ago

A circle has an initial radius of 50ft when the radius begins decreasing at a rate of 2ft/s. what is the rate of change of the a

valkas [14]

The area of the circle with radius r is
A = πr²

The rate of change of area with respect to time is
$\frac{dA}{dt} = \frac{dA}{dr} . \frac{dr}{dt} =2 \pi r. \frac{dr}{dt}$

The rate of change of the radius is given as
$\frac{dr}{dt} =-2 \, \frac{ft}{s}$
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Answer: - 40π ft²/s (or - 127.5 ft²/s)

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