In a cycling road race consisting of a flat section and an uphill section, a particular cyclist pedals with an average power of 324 Watts for 5.50 hours on the flat section of the course, and an average power of 418 Watts for 30.0 minutes while climbing the uphill section, which has an average grade of 6%. Potentially useful information: Power = Energy/time; 1 Watt = 1 Joule/sec; 1 kcal = 4186 J (Note, 1 kcal = 1 food Calorie)
(a) Calculate the average mechanical power output of the cyclist over the whole race.
(b) Given that the human body has an efficiency of 25.0% at converting food energy into mechanical output, how many kcal of food energy must the cyclist consume to replace the mechanical energy expended during the race?
In a cycling road race consisting of a flat section and an uphill section, a particular...
1) In a cycling road race consisting of a flat section and an uphill section, a particular cyclist pedals with an average power of 324 Watts for 5.50 hours on the flat section of the course, and an average power of 418 Watts for 30.0 minutes while climbing the uphill section, which has an average grade of 6%. Potentially useful information: Power = Energy/time; 1 Watt = 1 Joule/sec; 1 kcal = 4186 J (Note, 1 kcal = 1 food...
Useful conversions: 1 BTU ~103 J; 1 kcal ~ 4 x 103 J; 1 food calorie = 1 kcal The average US citizen uses 1 million BTUs per day as a member of our industrialized society. Assume this energy is provided entirely by a group of laborers, each capable of generating a steady 200 W of power (generous assumption) for an 8 hour shift. How many laborers does an average citizen require? Assume your laborers are 100% efficient at converting...
Could I get some help on this question please? Also show your work if possible and have a wonderful day! < Review of Energy and Work (Chapters 9 and 10) Problem 9.62 34 ot 38> Part A When you ride a bicycle at constant speed, nearly all the energy you expend goes into the work you do against the drag force of the air. Model a cyclist as having cross-section area 0.42 m2 and, because the human body is not...
Problem 2: Pedal Power Many villages in the developing world lack access to electricity. One proposed solution is the ‘Free Electric’ bicycle, which is a stationary bike hooked up to a generator and battery. Pedaling the bike powers the generator, which creates electricity that is stored in the battery. The inventor claims that 1 hour on the bike can produce a whole day of electricity. Let’s put it to the test! Assume the following: The human body is 25%...
Need help on part D & E Problem 2: Pedal Power Many villages in the developing world lack access to electricity. One proposed solution is the ‘Free Electric’ bicycle, which is a stationary bike hooked up to a generator and battery. Pedaling the bike powers the generator, which creates electricity that is stored in the battery. The inventor claims that 1 hour on the bike can produce a whole day of electricity. Let’s put it to the test! Assume the...