Your car is initially moving at 16.8 m/s when your hit the brakes and the car begins to slow down. The car has a mass of 621 kg and
the coefficient of friction between the tires and the road is 0.7.
What is the time needed to stop the car and how much ground
does it cover during this process?

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?

Why do electron microscopes have higher resolving power than light microscopes?

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. how long will the ball be in the air before it lands? how far will the football travel before it lands?