Physics help!!! (part 1)?

Question

These are the questions that we need to answer in our problem set and case study. Please help!

1. The new EV-1 electric car makes use of storage batteries as its source of energy. Its mass is 1300 kg and it is powered by 26 batteries, each 12 V, 52 A•h. assume that the car is driven on the level at an average speed of 40 km/hr and the average friction force is 240 N. Assume 100% efficiency and neglect energy used for acceleration. Note that no energy is consumed when the vehicle is stopped since the engine doesn’t need to idle. (a) Determine the horsepower required. (b) After approximately how many kilometers must the batteries be recharged?

2. A nerve is stimulated with an electric pulse. The action potential is detected at a point 3.40 cm down the axon 0.0052 s later. When the cation potential is detected 7.20 cm from the point of simulation, the time required is 0.0063 s. What is the speed of the electric pulse along the axon? Why are two measurements needed instead of only on

Answer 1

I can help you on the first question.
The average speed of the car is:
40 km/hr = 40000m/3600s = 11.1 m/s
The required average power is: 240N*11.1 m/s = 2.67 kW
Since one horsepower is 746 W, the required average power is also 3.57 horsepower.
Now, 26 batteries, each 12 V, 52 A•h, contains a total energy of:
26*12*52 = 16.2 kW•h
At the power of 2.67kW, the batteries can be used for 6.1 hr, hence 243 km before battery recharge.

Answer 2

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