A plane is traveling eastward at an airspeed of 500 km/h. But a 90 km/h wind is blowing south- ward. What are the direction and speed of the plane relative to the ground?
VO

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

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

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?