In the secondary winding of a transformer, which color wire is grounded to earth?
O Black
Green
Red
White

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

An ideal polarizer with its transmission axis rotated 30 degrees to the vertical is placed in a beam of unpolarized light of intensity 10w/m^2. after passing through the polarizer, what is the intensity of the beam? a. 8.7 w/m^2 b. 7.5 w/m^2 c. 5.0 w/m^2 d. 10 w/m^2 e. 2.5 w/m^2