Velomobile Characteristics Mass: 29 kg in addition to the rider Aerodynamic drag: F = 0.0492 V (Newtons) Rolling drag coefficient: C, = 0.01 Rolling drag: F, = C,,N Mountain Bike Characteristics Mass: 10 kg in addition to the rider Aerodynamic drag: F, = 3. 309 V° (Newtons) Rolling drag coefficient: C Rolling drag: F, = C,N 0.005 %3D Perform the following assuming the bike and velomobile are on flat terrain. (a) Draw a free body diagram for each Neglecting the rotational energy of the wheels, determine: (b) The power required for each to travel 24 and 32 kph (about 15 and 20 mph) (c) The velocity with a power input of 150 W (d) The velocity going up a 6% grade with a power input of 150 W (you will also need a new free body diagram) (e) The work input required for each on a 12 km trip traveling 32 kph with 12 full stops and accelerations back up to speed. (f) Calculate the amount of calories burned. Assume the human body is 25% efficient.

Velomobile Characteristics Mass: 29 kg in addition to the rider Aerodynamic drag: F = 0.0492 V (Newtons) Rolling drag coefficient: C, = 0.01 Rolling drag: F, = C,,N Mountain Bike Characteristics Mass: 10 kg in addition to the rider Aerodynamic drag: F, = 3. 309 V° (Newtons) Rolling drag coefficient: C Rolling drag: F, = C,N 0.005 %3D Perform the following assuming the bike and velomobile are on flat terrain. (a) Draw a free body diagram for each Neglecting the rotational energy of the wheels, determine: (b) The power required for each to travel 24 and 32 kph (about 15 and 20 mph) (c) The velocity with a power input of 150 W (d) The velocity going up a 6% grade with a power input of 150 W (you will also need a new free body diagram) (e) The work input required for each on a 12 km trip traveling 32 kph with 12 full stops and accelerations back up to speed. (f) Calculate the amount of calories burned. Assume the human body is 25% efficient.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.49P

See similar textbooks

Similar questions

3.) Automotive engineers work very hard to improve the value of the drag coefficient for cars. Suppose you have a car with a mass of 3000. kg and an effective surface area of 4.00 m^2. The engine can generate a maximum force of 28,000. N. Let the coefficient of kinetic friction be 0.200, and the coefficient of static friction be 0.400. Air has a density of 1.21 kg/m^3. (back on earth) (3a) Draw a free-body diagram for your car, including both drag and friction, when the car is moving at its maximum velocity. (3b) If the maximum value of your car's velocity is 150.0 m/s, then what is the drag coefficient for the car? (3c) Suppose your engineers change the drag coefficient to 0.300 - what would be your maximum velocity then with the same force from your engine.
Skydiver Luke jumps with his parachute of diameter D = 12m out of an airplane. The combined mass of the parachute and Luke is 100 kg. The drag coefficient for the fully open parachute is C_{D} = 1.4 . Neglecting acceleration and considering a linear change of air density with altitude, estimate Luke's fall time between altitudes of 3000 m and 2000 m. For the density of air at these two altitudes, assume pair (3000m) = 1.0 kg/m³ and pair (2000m) = 1.1 kg/m³.
Subject:SUBSONIC/APPLIED AERODYNAMICS Question:Calculate the propeller power coefficient and static thrust of an engine-propeller combination at a standard altitude of 8km, with a shaft horsepower of 385 hp. The characteristics of the propeller are the following: n = 45 rps D = 1.9 m CT/CP = 2.32
What is used as a similarity parameter to help determine whether the flow in a body and its scaled version are aerodynamically similar? Similarity Coefficient Mach Number Skin Friction Drag Coefficient Reynolds Number Thank you.
A propeller-driven aircraft has an in-flight weight of 4,105 lb (equivalent to a mass of 1,862 kg) and is cruising at a true airspeed of 120 kts. The lift-to-drag ratio of the aircraft is 8.2. If the propeller efficiency, ηp, is 0.8, then how much brake power is required for flight? Work through this problem in both USC and SI units.
Jane wants to estimate the drag coefficient of herself on herbicycle. She measures the projected frontal area to be 0.40 m2and the rolling resistance to be 0.80 N . s/m. The mass ofthe bike is 15 kg, while the mass of Jane is 80 kg. Jane coasts down a long hill that has a constant 4° slope. (SeeFig. ) She reaches a terminal (steady-state) speed of14 m/s down the hill. Estimate the aerodynamic drag coefficient CD of the rider and bicycle combination.
What is the formula and variables in finding the air drag of a motorcycle?
A shuttlecock is launched from the ground with an initial speed of 36.9838 m/s at an angle of 9.9728 degrees with respect to the horizontal. The shuttlecock experiences air resistance with a drag coefficient of 0.1967 in an environment where the air density is 0.7584 kg/m3. If the shuttlecock has a radius of 3.4 cm and a mass of 5.2 grams, what is the maximum height reached by the shuttlecock? Assume that the experiment is done near the surface of the earth.
Discuss the following exchange processes between the earth and the atmosphere and the importance of boundary layer turbulence on them:(a) sensible heat;(b) water vapor;(c) momentum
. A bicyclist of mass 70 kg supplies 300 W of power while riding into a 3 m/s headwind. The frontal area of the cyclist and bicycle together is 0.36 m^2 , the drag coefficient is 0.88, and you can ignore rolling resistance. Determine the speed of the cyclist (assuming standard atmospheric conditions).
A C-130 pilot desires to fly a low-level navigation mission at 4 n miles/ min (240 kn ground speed).Winds are forecast out of the north (blowing south) at 20 kn, the pressure altitude is 10,000 ft, andthe temperature is 80 °F. What indicated airspeed should the pilot fly on a northbound leg if theposition error is negligible? The answer is q = 136 lb/ft2
Suppose you are designing the propeller of a radio-controlled model airplane. The overall diameter of the propeller is 34.0 cm, and the hub assembly diameter is 5.5 cm. The propeller rotates at 1700 rpm, and the airfoil chosen for the propeller cross section achieves its maximum efficiency at an angle of attack of 14°. When the airplane flies at 30 mi/h (13.4 m/s), calculate the blade pitch angle from the root to the tip of the blade such that ? = 14° everywhere along the propeller blade.