A car moves north at a constant speed of 3 ms^-1 for 20 s and then east at a constant speed of 4ms^-1 for 20s. What is the average speed of the car during this motion?

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

Steam enters an adiabatic diffuser at 150 kpa and 1208c with a velocity of 550 m/s. determine the minimum velocity that the steam can have at the outlet when the outlet pressure is 300 kpa.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?