will a fog machine set off the fire alarm?
Go to the website above to see a picture of the car’s brakes. The friction force between the disc rotor and the disc pads causes the rotational velocity of wheels to decrease. So, the work, done by the friction, causes the kinetic energy of the car to decrease. When the car is moving, the wheels are rotating. The wheel is attached to wheel studs. The wheel studs are attached to the disc rotor. So, the disc rotor is rotating at the same speed as the wheel. As the driver pushes the brake pedal down, the disc pads exert force on the disc rotor. This force is perpendicular to the surface of the disc rotor. Friction force ? * Force perpendicular As the disc pads exert force on the disc rotor, the work done by the friction force causes the temperature of the disc pads and disc rotor to increase. If you touch the metal disc rotor, you will feel the heat energy that is produced during this process. Before the brakes were applied, this energy was part of car’s internal energy. D is the answer.
Heat doesn't transfer well through vacuum. So I guess they make the contact between inner shell and outer shell minimal and pump out the air.
