Physics, 18.08.2019 22:30 plssshelp

If a skydiver weighs 800 n, what would air resistance be when he is at terminal velocity?

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Let his weight be mg.

For a falling body in a fluid.

W - V - U = ma. Where
   W = Weight = 800N.
      m = mass
       V = Viscous Force = Air Resistance.
   U = upthrust = Negligible for air.
   a = acceleration
   g = acceleration due to gravity.
Note also at terminal velocity a = zero.

W - V - 0 = m(0)
800 - V = 0
800 = V.

Therefore the viscous force which is equivalent to air resistance is also 800N.
Cheers.

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

Answer from: Quest

the unit of the measure = $\frac{j}{kgk}$

explanation:

the property that is quantified by the energy needed per of material to raise the temperature by one.

si unit of energy = joule (j)

si unit of temperature = kelvin (k)

si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is $\frac{j}{kgk}$

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