Which of the following statements is not true about speed? a. speed has no direction. b. speed is a vector quantity. c. speed and position are separate variables. d. speed is measured relative to another object.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

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?

Aball horizontally thrown from a cliff at 8m/s