A scuba diver descends to a depth of 20m. At that depth, thepressure is approximately A)atmospheric pressure.
B)twice atmospheric pressure.
C)three times atmospheric pressure.
D)four times atmospheric pressure.
Hint:
P = P0 + rho*g*h Do not forget P0, the atmosphericpressure.

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.