Solving for work Power equations

[eanderson]

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 155-km race in which his average speed is 12.3 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 = 2.389 x 10-4 nutritional Calories.

(avg)P=w/t

ke=1/2mv^2

w=KEf - KEi

(avg)P= F * S(avg)

 

[eanderson]

the answer for those numbers is:

A: 6143292.682926829 J
B: 1466.846 Calories

 

[learningphysics]

the answer for those numbers is:

A: 6143292.682926829 J
B: 1466.846 Calories

Looks good. watch the rounding though... I'm getting 1467.6 calories...