At an accident scene on a level road, investigators measure a car’s skid mark to be 88 m long. the accident occurred on a rainy day, and the coefficient of kinetic friction was estimated to be 0.42. use this data to determine the speed of the car when the driver slammed on (and locked) the brakes. use the work-energy principle to solve this problem. (while you are doing the problem think about why the car’s mass does not matter.)

What produces a record of seismic waves? richter scale seismogram barometer seismograph

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?

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy