Abicycle has a momentum of 36 kg m/s and avelocity of 4 m/s. what is the mass of the bicycle?

Answer : The mass of the bicycle is, 9 Kg

Solution : Given,

Momentum of a bicycle = 36 Kg m/s

Velocity of a bicycle = 4 m/s

Momentum : It is defined as the product of the mass of an object and the velocity of an object.

Formula used :

where,

p = momentum of an object

m = mass of an object

v = velocity of an object

Now put all the given values in the above formula, we get the mass of the bicycle.

Therefore, the mass of the bicycle is, 9 Kg

Momentum=36kgm/s
velocity=4m/s
mass=?
momentum=mass*velocity
mass=9kg

Snell's law: n1Sinα=n2Sin β where α=Incidence angle, β=angle of refraction, n1 and n2 are the indices of refraction for water and air respectively.
Therefore,
Sinα=n2/n1 Sinβ For refracted ray to be along the surface of water, β=90° and thus Sinβ = 1

Sinα=n2/n1= 1/1.33 = 0.7519 => α=sin^-1 (0.7519) = 48.75°
When light moves from a medium of higher index of refraction (such as water) to medium of lesser index of refraction (such as air), the refracted ray is bend such that α is bigger than β. This  is internal refraction. At some value of α, β approaches 90°. This incidence angle is called critical incidence angle. Therefore, the current scenario is shows critical angle of incidence.