A 7.3 kg mass falls from rest and increases its speed to 3.2 m/s. How much work was done on the mass by gravity?

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.