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Electric CarsIn recent years, practical hybrid cars have hit the road - cars in which the gasoline engine runs a generator that charges batteries that run an electric motor. These cars offer increased efficiency, but significantly greater efficiency could be provided by a purely electric car run by batteries that you charge by plugging into an electric outlet in your house.But there's a practical problem with such vehicles: the time necessary to recharge the batteries. If you refuel your car with gas at the pump, you add 130 of energy per gallon. If you add 20 gallons, you add a total of 2.6 in about 5 minutes. That's a lot of energy in a short time; the electric system of your house simply can't provide power at this rate.There's another snag as well. Suppose there were electric filling stations that could provide very high currents to recharge your electric car. Conventional batteries can't recharge very quickly; it would still take longer for a recharge than to refill with gas.One possible solution is to use capacitors instead of batteries to store energy. Capacitors can be charged much more quickly, and as an added benefit, they can provide energy at a much greater rate - allowing for peppier acceleration. Today's capacitors can't store enough energy to be practical, but future generations will.Part AA typical home's electric system can provide 100 at a voltage of 220 . If you had a charger that ran at this full power, approximately how long would it take to charge a battery with the equivalent of the energy in one gallon of gas?Part BThe Tesla Roadster, a production electric car, has a 375 battery system that can provide a power of 200 . At this peak power, what is the current supplied by the batteries?Part CTo charge the batteries in a Tesla Roadster, a transformer is used to step up the voltage of the household supply. If you step a 220 , 100 system up to 400 , what is the maximum current you can draw at this voltage?Part DOne design challenge for a capacitor-powered electric car is that the voltage would change with time as the capacitors discharge. If the capacitors in a car were discharged to three quarters of their initial voltage, what fraction of energy would still be left?
With cooperation acrobats in circular rotating cages that are attached to two beams in a shape of a cross (one cage attached to each end of the beam) can rotate the beams. Where does this energy come from
In the Bohr model of the hydrogen atom, an electron in the 1st excited state moves at a speed of 2.19 *10^6 m/s in a circular path having a radius of 5.29*10^-11 m
The blood flow speed through an aorta with a radius of 1.00 cm is 0.365 m/s, If aorta constricts to a radius of 0.800 cm, how much does blood flow speed increase
A rocket is launched from rest with an acceleration of 30m/s^2 for the duration of one second when it runs out of fuel. What is the max height of the rocket
The cable lifting an elevator is wrapped around a 1.0-m-diameter cylinder that is turned by the elevator's motor. How long does it take for the elevator to stop
A boy catches - with bare hands and his arm extended - a 0.16 kg baseball coming directly toward him ar a speed of 25 m/s. what is the average force the boy's hand feel while catching the ball
What will the traveler weigh on another planet. Two wires are identical, except that one is aluminum and one is iron. The aluminum wire has a resistance of 0.18 . What is the resistance of iron wire.
A train is traveling with a speed of 16.0 m/s relative to Earth. What is the velocity of the baseball relative to Earth
You are asked to design a spring that will give a 1000 kg satellite a speed of 3.20 m/s relative to an orbiting space shuttle. find What distance must the spring be compressed
The side-view mirror of an automobile has a radius of curvature of 15.0 cm. How far is the object from the mirror
A 3.2-kg block of iron (c=0.11 kcal/kgoC) that has been brought to a temperature of 1,045oC is placed on top of a 2.4-kg block of ice (c=0.5 kcal/kgoC) that has been cooled to -50oC
consider a 150 ohm and 180 ohm resistor connected in a parallel combination with a 9 volt battery. determine the total resistance of the parallel combination.
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