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3 years ago

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What waves have wavelengths longer than those of visible light? Give an example of how each kind of wave is used.

1 answer:

egoroff_w [7]3 years ago

7 0

<span>The visible light has wavelength in the range 400 - 700 nano-meters. The wavelengths longer than visible light are: 1-Infrared waves (used in ringtone/mobile waves)2-microwaves - used to heat and cook food. 3- Radio waves - used in communication purposes.</span>

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Which is greater, the gravitational force between earth and the moon, or the force between earth and the sun?

Karo-lina-s [1.5K]

Earth and the Sun
GF = 3.647x10^22 N

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3 years ago

. A weather balloon is inflated to a volume of 2.2 x 103 L with 37.4 g of helium. What is the density of helium in grams per lit

Margarita [4]

That is the mst best eway to find its solution.
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so we conclude that option b is sorrect

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3 years ago

The heat energy gained by the water in one minute is ?

kari74 [83]

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3 years ago

When the distance between two stars decreases by one-third, the force between them

pashok25 [27]

Answer:

the force will increase by a factor 2.25

Explanation:

The gravitational force between the two stars is given by:

$F=G\frac{m_1 m_2}{r^2}$

where

G is the gravitational constant

m1, m2 are the masses of the two stars

r is the distance between the stars

If the distance is decreased by one-third, it means that the new distance is 2/3 of the previous distance

$r'=\frac{2}{3}r$

So the new force will be

$F'=G\frac{m_1 m_2}{(\frac{2}{3}r)^2}=\frac{9}{4} G\frac{m_1 m_2}{r^2}=2.25 F$

So, the force will be 2.25 times the previous value.

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3 years ago

If you were trying to describe the difference between power and work you could say...?

Paha777 [63]

Answer:

Look to the explanation

Explanation:

<u><em>Work done</em></u> is is the energy transferred to or from an object by means

of a force acting on the object.

Work is positive if energy transferred to the object, and work is

negative if energy transferred from the object.

<em>Work = Force in the direction motion of object × its displacement</em>

$W=F*s$

The SI unit of the work is joule (J)

<u><em>Power</em></u> is the rate of work

<em>Power = work done ÷ time taken</em>

Power = $\frac{F*s}{t}$

Displacement (s) ÷ time (t) = velocity (v)

<em>Power = Force × velocity</em>

$P=F*v$

The SI unit of the power is watt (w)

6 0

3 years ago