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My Assignment
A rear wheel drive car of mass 2000kg has a rolling resistance of 150 N, a frontal area of 2.5m2, a drag coefficient of 0.70, a transmission loss of 12% and a maximum engine output of 60kW. Assuming that the traction limit for each tyre is equal to the weight it carries and a 60/40 weight transfer to the back wheels under acceleration,
Take the density of air to be 1.2 Kg/m3 and g = 9.8 m/s2
a) What is the maximum power available at the back wheels?
b) What is its theoretical maximum speed in mph on a level road?
c) What is its theoretical maximum speed in mph up a 1 in 10 hill?
d) What is the maximum tractive force that each of the rear tyres could provide under acceleration before slipping occurs?
e) What would be the maximum, useable, tractive force at each of the rear tyres if full power was applied at 12.98 mph? (hint: is the useable tractive force limited by engine power or tyre grip?)
f) What would be the wind resistance at 12.98 mph?
g) What would be the acceleration (in mph/s) at 12.98 mph on the level?
h) What would be the acceleration (in mph/s) at 12.98 mph up a 1 in 10 hill?
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I was wondering if you guys could help me out please thank you.
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