If a long straight wire carries a current of 40A, then the magnitude of the field B at a point 15cm away from the wire is:. A. 5.34×10−5T
B. 8.34×10−5T
C. 9.6×10−5T
D. 10.2×10−5T

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

What does si stand for,when referring to a system of measurement

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