A horizontal spring with spring constant 150 N/m extends outward from a rigid wall. A 200 kg k g bumper car, including the mass of the occupant, hits the end of the spring at a speed of 0.50 m/s. By how much has the car’s kinetic energy changed at the instant the spring has maximum compression?
How much work does the spring do on the car from the moment of impact until the spring has maximum compression?
What is the maximum compression of the spring?

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 place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is