Cycling. For a touring bicyclist the drag coefficient C1ƒ = 1 CArv22 is 1.00, the frontal...

Cycling. For a touring bicyclist the drag coefficient C1ƒ = 1 CArv22 is 1.00, the frontal area A is 0.463 m^2, and the coefficient of rolling friction is 0.0045. The rider has mass 50.0 kg, and her bike has mass 12.0 kg. (a) To maintain a speed of 12.0 m/s (about 27 mi/h) on a level road, what must the rider’s power output to the rear wheel be? (b) For racing, the same rider uses a different bike with coefficient of rolling friction 0.0030 and mass 9.00 kg. She also crouches down, reducing her drag coefficient to 0.88 and reducing her frontal area to 0.366 m^2. What must her power output to the rear wheel be then to maintain a speed of 12.0 m/s? (c) For the situation in part (b), what power output is required to maintain a speed of 6.0 m/s? Note the great drop in power requirement when the speed is only halved. (For more on aerodynamic speed limitations for a wide variety of human-powered vehicles, see “The Aerodynamics of Human-Powered Land Vehicles,” Scientific American, December 1983.)

Solutions

Expert Solution

genius_generous answered 8 months ago

Next > < Previous

Related Solutions

A 2750 lb car has a frontal cross-sectional area A of 22.4 ft2, a drag coefficient...

A 2750 lb car has a frontal cross-sectional area A of 22.4 ft2, a drag coefficient Cd of 0.28, and a drive (or tractive) force of 280 lbs. Assume an air density of 2.3x10-3 slug/ft3. A. Determine the acceleration of the car when it is driving at 31 mph on a level road. B. Determine the acceleration of the car when it is driving at 31 mph on a level road into a 7 mph head wind. C. Determine the acceleration of the...

Scatterplot of daily cycling distances and type of climb: Every summer, the touring company America by...

Scatterplot of daily cycling distances and type of climb: Every summer, the touring company America by Bicycle conducts the “Cross Country Challenge,” a 7-week bicycle journey across the United States from San Francisco, California, to Portsmouth, New Hampshire. At some point during the trip, the exhausted cyclists usually start to complain that the organizers are purposely planning for days with lots of hill and mountain climbing to coincide with longer distances. The tour staff counter that no relation exists between...

( fluid lab) I need theory for Drag Coefficient and Effect of Angle of Attack on...

( fluid lab) I need theory for Drag Coefficient and Effect of Angle of Attack on sphere Please in computer not hand writing

The person’s mass, m= 68.1 kg, the unknown drag coefficient is, c , with units kg/s,...

The person’s mass, m= 68.1 kg, the unknown drag coefficient is, c , with units kg/s, and the local acceleration of gravity is g= 9.80 m/s2 . Our model for the person’s velocity vs time gave us a linear differential equation whose analytical solution was the following: V(t) = g*m/c*[1-exp(-c/m*t)]. Your job is to find “c”. You need to use the MATLAB “help” documentation to find the nonlinear curve fitting function and syntax for how to use it. Hint you...

A 1.00 kg mass slides to the right on a surface having a coefficient of kinetic...

A 1.00 kg mass slides to the right on a surface having a coefficient of kinetic friction 0.250. The object has a speed of vi = 2.70 m/s when it makes contact with a light spring that has a force constant of 50.0 N/m. The object comes to rest after the spring has been compressed a distance d. The object is then forced toward the left by the spring and continues to move in that direction beyond the spring's unstretched...

What would you conclude if a sample correlation coefficient is equal to -1.00? A. Most of...

What would you conclude if a sample correlation coefficient is equal to -1.00? A. Most of the data points must fall exactly on a horizontal straight line. B. All the data points must fall exactly on a straight line with a positive slope. C. All the data points must fall exactly on a straight line with a negative slope. D. Most of the data points must fall exactly on a straight line with a positive slope.

The US consumer fleet (cars, SUV’s, vans, cross-overs and light trucks) has an average drag coefficient...

The US consumer fleet (cars, SUV’s, vans, cross-overs and light trucks) has an average drag coefficient of 0.4, an average miles driven per year of 12,500 at 50 MPH and an average frontal area of 5.5 m2. Being that there are 265 million of these ‘average’ vehicles on the road driven by consumers, calculate: a. Gasoline consumed per vehicle annually assuming 25% overall efficiency b. Gasoline consumed per vehicle annually assuming if the speed limit on federal highways was cut...

Describe the following anatomical sections 1. Longitudinal in median, sagittal and frontal planes 2. Transverse at...

Describe the following anatomical sections 1. Longitudinal in median, sagittal and frontal planes 2. Transverse at right angles to the longitudinal section 3. oblique at any other angles (you can use diagrams for this question)

a=2 b=1 A bullet is to be tested in the laboratory to determine the drag force...

a=2 b=1 A bullet is to be tested in the laboratory to determine the drag force on it. Dependent parameter the drag force D (Newton) depends on the velocity of the bullet V(m/s), the length of the bullet L(m), sound velocity c(m/s), density of fluid ρ (kg/m3) and dynamic viscosity µ(kg/ms). Solve the problem by making the necessary assumptions and drawing the schematic figure I-Determine the nondimensional p parameters using repeating variables ii-a bullet with a speed of 9a,b m/s...

1. what is the hypothalamus main function? 2. the frontal primary cortex controls what muscles? 3....

1. what is the hypothalamus main function? 2. the frontal primary cortex controls what muscles? 3. where is vision interpreted in the brain? 4. Receptors witg large receptive fields would be located in the fingertips or torso areas? 5. what brain area regulates most homeostatic regulation? 6. Type A nociceptors provide what kind of signals? 7. Receptors will recieve string and weak stimuli. How do they reapond to the different stimuli? 8. The motor division of the PNS sends signals...

Subjects