An automobile having a mass of 1700 kg (chevy volt with one person) is traveling at 15 m/s. on average, it gets an "electric mileage" of 300 wh/km and the battery-to-wheel efficiency is 90%. a. what is its kinetic energy in kj? how much work must be done to bring it to a stop?
b. assume the vehicle is able to recapture half of the kinetic energy through a generator into the battery, and that this happens 50 times over 100 km of driving. how much further was the car able to travel because of regenerative braking?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?