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3 years ago

Atoms of the same element having unequal numbers of protons and electrons are called __________

Physics

1 answer:

stiks02 [169]3 years ago

3 0

Atoms of the same element having unequal numbers of protons and electrons are called __________IONS

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Which would likely demagnetize a magnetized iron nail?

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Dropping it on a hard surface.

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Derive an expression for the energy needed to launch an object from the surface of Earth to a height h above the surface.Ignorin

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Answer:

Explanation:

Potential energy on the surface of the earth

= - GMm/ R

Potential at height h

= - GMm/ (R+h)

Potential difference

= GMm/ R - GMm/ (R+h)

= GMm ( 1/R - 1/ R+h )

= GMmh / R (R +h)

This will be the energy needed to launch an object from the surface of Earth to a height h above the surface.

Extra energy is needed to get the same object into orbit at height h

= Kinetic energy of the orbiting object at height h

= 1/2 x potential energy at height h

= 1/2 x GMm / ( R + h)

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1 year ago

For a given wave IF frequency doubles the wavelength

motikmotik

Answer:

C is halved

Explanation:

The frequency and the wavelength of a wave are related by the equation:

$v=f\lambda$

where

v is the speed of the wave

f is the frequency

$\lambda$ is the wavelength

From the equation above, we see that for a given wave, if the wave is travelling in the same medium (and so, its speed is not changing), then the frequency and the wavelength are inversely proportional to each other.

Therefore, if the frequency doubles, the wavelength will halve in order to keep the speed constant:

$\lambda = \frac{v}{f}\\\lambda' = \frac{v}{f'}=\frac{v}{2f}=\frac{1}{2}(\frac{v}{f})=\frac{\lambda}{2}$

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3 years ago

What difference will you get from the flying or air filled balloon and the hydrogen filled balloon.

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Answer:

the hydrogen filled balloon is denser than the air filled balloon

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