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3 years ago

Friction is generated when?

Physics

1 answer:

valkas [14]3 years ago

8 0

Things are rubbed against each other

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Which statement is true about the formation of bonds?

Ivenika [448]

There are no true statements on the list you attached.

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2 years ago

State 2 chemical properties of metals

Ivahew [28]

Answer:

#they react with oxygen to form basic oxides.

#they react with water to produce hydrogen and oxides

#they react with acids to produce H+

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2 years ago

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A planet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass M 2.75 x 1029 kg. The radius of the orbit is R 8

Umnica [9.8K]

Answer:

The orbital period of the planet is 387.62 days.

Explanation:

Given that,

Mass of planet $m =6.75\times10^{24}\ kg$

Mass of star $m'=2.75\times10^{29}\ kg$

Radius of the orbit $r =8.05\times10^{7}\ km$

Using centripetal and gravitational force

The centripetal force is given by

$F = \dfrac{mv^2}{r}$

$F=m\omega^2r$

We know that,

$\omega=\dfrac{2\pi}{T}$

$F=m(\dfrac{2\pi}{T})^2r$ ....(I)

The gravitational force is given by

$F = \dfrac{mm'G}{r^2}$ ....(II)

From equation (I) and (II)

$m(\dfrac{2\pi}{T})^2r=\dfrac{mm'G}{r^2}$

Where, m = mass of planet

m' = mass of star

G = gravitational constant

r = radius of the orbit

T = time period

Put the value into the formula

$T^2=\dfrac{4\pi^2R^3}{m'G}$

$T^2=\dfrac{4\times(3.14)^2\times(8.05\times10^{7})^3}{2.75\times10^{29}\times6.67\times10^{-11}}$

$T=2\times3.14\times\sqrt{\dfrac{(8.05\times10^{10})^3}{2.75\times10^{29}\times6.67\times10^{-11}}}$

$T =3.34\times10^{7}\ s$

$T= 387.62\days$

Hence, The orbital period of the planet is 387.62 days.

4 0

3 years ago

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If the amplitude of the waves coming from a light bulb decreased, which would you expect to happen?

jekas [21]

The amplitude of the electromagnetic waves coming from
a light bulb is exactly an indication of the energy carried by
the waves.

If their amplitude decreases, then the waves are carrying less
energy. The brightness of the light decreases, AND the bulb
runs cooler, because it produces less heat.

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3 years ago

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Green light can have a wavelength of 512 nm. The energy of a photon of this light is

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Answer:

$E = 3.88 * 10^{-17} J$