Solving for work Power equations

  • Thread starter Thread starter eanderson
  • Start date Start date
  • Tags Tags
    Power Work
AI Thread Summary
Bicyclists in the Tour de France exert significant power, with Lance Armstrong generating an average of 6.50 W/kg during a race. For a 155-km race at an average speed of 12.3 m/s, he performs approximately 6,143,293 joules of work. When converted to nutritional Calories, this equates to about 1,466.846 Calories. There is a slight discrepancy in calorie calculations, with one participant noting a result of 1,467.6 Calories. Accurate rounding and unit conversions are essential for precise results.
eanderson
Messages
21
Reaction score
0
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)
 
Physics news on Phys.org
the answer for those numbers is:

A: 6143292.682926829 J
B: 1466.846 Calories
 
eanderson said:
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...
 
Thread 'Voltmeter readings for this circuit with switches'

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

How to solve how much work is done:
Replies
1
Views
4K
Avg Power in a Rotational Energy/Work Problem
Replies
6
Views
1K
What Is the Average Power of Bullets Bouncing Off Superman?
Replies
26
Views
4K
Powering the Human Brain: How Long Can One Snickers Bar Last?
Replies
2
Views
11K
Car acceleration kinematics give average power
Replies
5
Views
2K
How long can a Snickers bar power the human brain?
Replies
3
Views
7K
Average power consumption in watts
Replies
4
Views
31K
Finding units for power via Dimensional Analysis? Makes no sense
Replies
2
Views
3K
How Long to Climb Three Flights of Stairs?
Replies
3
Views
4K
Bike Race Problem: Solving for Applied Force, Work, Power & Acceleration
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top