2. a 2000 kg car with speed 12.0 m/s hits a tree. the tree does not move or
break and the front of the car is smashed inward 50.0 cm. ignore friction. (a)
determine the work done on the car by the tree. (b) determine the amount of
force involved.

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

What is special about a dc circuit ?

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)