1. Water moving with a speed of 0.1 m / s enters a tube with a radius of 1.3 cm. It comes out of a section of tube that has a radius of 0.5 cel, and its output speed is: a) 0.26 m/s
b)0.68 m/s
c)0.04 m/s
d)0.01 m/s

Could someone me find the answer to this problem.

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?

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost