A new type of electric car makes use of storage batteries as itssource of energy

Question

A new type of electric car makes use of storage batteries as itssource of energy. Its mass is 1240 Kg and it is powered by 26batteries, each 12 V, 52 Ah. Assume that the car is driven on alevel surface at an average speed of 45 km/h, and the averagefriction force is 237 N. Assume 100 percent efficiency and neglectenergy used for acceleration. Note that no energy is consumed whenthe vehicle is stopped since the engine does not need to idle.

1. Determine the horsepower required?

2. After approximately how many kilometers must the batteries becharged?

Explanation / Answer

power require to move the car    P = F*V*3600sec/hr (in Watts) F = average frictional force V = velocity of the car       1hp = 746 watts    from the above equivalence we candetermine P in horsepower   energy stored in a battery E =Q V Q = (52 *3600) col V = battery Voltage    total numer of time the car runs forcomplete charge    t = E/ P.    distance travelled in thistime    S= V * t pluggin the values in teh above equaion we can sovle forS .

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