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3 years ago

Why are metals so much better at conducting than other solids

Physics

1 answer:

Over [174]3 years ago

5 0

Answer:

Explanation:

Metals are by far better conductors of electricity than most solids because individual atoms in a metal form a matrix which their outer electrons can move freely. These atoms form a "sea" of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.

Solids are usually rigid substances with their atoms in a fixed place unable to move freely.

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A 0.45 kg soccer ball changes its velocity by 20.0 m/s due to a force applied to it in 0.10 seconds. What force was necessary fo

frutty [35]

Answer:

90 N

Explanation:

The force applied to the ball is given by:

$F=\frac{\Delta p}{\Delta t}$

where

$\Delta p$ is the change in momentum of the ball

$\Delta t$ is the time taken

The change on momentum of the ball is:

$\Delta p=m\Delta v=(0.45 kg)(20 m/s)=9 kg m/s$

So, the force applied is

$F=\frac{9 kg m/s}{0.10 s}=90 N$

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3 years ago

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An apple weighs at 1N. the net force on the apple when it is in free fall is?

ololo11 [35]

The weight of an object <em>IS</em> the net force on it when it's in free-fall.

("Free fall" means that the only force acting on it is the force of gravity.
The force of gravity on an object is the force we call its "weight".)

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3 years ago

9. A pendulum bob is made with a ball filled with water. What would happen to the frequency of vibration of this pendulum if a h

Ilya [14]

Answer:

The frequency of vibration will be unchanged.

Explanation:

The frequency of oscillation of a simple pendulum is given by

$f = \dfrac{1}{2 \pi}\sqrt{\dfrac{g}{L}}$

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It can be seen from the formula that the frequency of the pendulum is independent of the mass.

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3 years ago

Why are the peaks opposite in direction?

blagie [28]

Answer:

Explanation:

Peaks are in opposite direction because change in magnetic field at one end of the coil is opposite to the change in magnetic field at other end of the coil. Faraday's law predict that the direction of induced voltage is dependent on the nature of change in magnetic field

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3 years ago

Luda [366]

Explanation:

heat engine is correct answer

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3 years ago

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