How many kilocalories are generated when the brakes are used to bring a 1100-kg car to rest from a speed of 85km/h ? 1 kcal = 4186 J
speed v =85 km/h =85*5/18 = 23.61 m/s
energy =0.5m(v^2-u^2) =0.5*1100(23.612 -0) =306616.5 J
energy E =306616.5/4186 = 73.24 kcal
How many kilocalories are generated when the brakes are used to bring a 1100-kg car to...
Calculate the force (in N) needed to bring a 1100 kg car to rest from a speed of 95.0 km/h in a distance of 100 m (a fairly typical distance for a non-panic stop). b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a). force in (b) force in (a)
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