Bicyclists in the tour de france do enormous amounts of work during a race. for example, the average power per kilogram generated by lance armstrong (m = 75.0 kg) is 6.50 w per kilogram of his body mass.
(a) how much work does he do during a 160-km race in which his average speed is 11.0 m/s?

(b) often, the work done is expressed in nutritional calories rather than in joules. express the work done in part (a) in terms of nutritional calories, noting that 1 joule = 2.389x10^-4 nutritional calories.

Explanation:

It is given that,

Average power per unit mass generated by Lance,

(a) Distance to cover race,

Average speed of the person, v = 11 m/s

If t is the time taken to cover the race.

t = 14545.46 s

Let W is the work done. The relation between the work done and the power is given by :

W = 7090911.75 J

(b) Since,

So, in 7090911.75 J,

W = 1694.01 J

Hence, this is the required solution.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

the maxium height is 34m/s