The brakes on your automobile are capable of creating a deceleration of 5.5 m/s^2. if you are going 143 km/h and suddenly see a state trooper, what is the minimum time in which you can get your car under the 97 km/h speed limit? (the answer reveals the futility of braking to keep your high speed from being detected with a radar or laser gun.)

Achild throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. the ball leaves her hand 1.00 m above the ground. how long is the ball in flight before it hits the ground?

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?