Which of the following occurs when light is reflected from a rough or unpolished surface ?

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2

Does heating a metal wire increase or decrease its electrical resistance? why?