Find the magnitude of the angular momentum of the second hand on a clock about an axis through the center of the clock face. assume the clock hand has a length of 15.0 cm and a mass of 6.00 g. consider the second hand to be a slender rod rotating with constant angular velocity about one end. (express your answer in the form: "1.23e-4 kg*m^2/s'.)

L = 4.711 *10^{-6} kg m2/s

Explanation:

   =4.5*10^-5

angular velocity

             = 0.1047 rad/s

the angular momentum,

L=4.711×

Explanation:

we have given mass m=6 gram =0.006 kg

length =15 cm =0.15 m

moment of inertia for the clock hand is given by

angular velocity

we know that angular momentum is given by

L=Iω

L=4.5××0.1047

L=4.711×

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.