A car has 400 kgm/s worth of momentum and runs into a truck initially at rest. After the collision, the truck has 500 kgm/s worth of momentum. What must be the final momentum of the car and truck combined? A. 500 kgm/s
B. 100 kgm/s
C. 400 kgm/s
D. -100 kgm/s

Air flows upward in the wick of a lantern because of the liquid property called

Water at room temperature of 20.0°c is poured into an aluminum cylinder which has graduation markings etched on the inside. the reading in the graduations is 300.0 cc. the cylinder with the water in it is then immersed in a constant temperature bath at a temperature of 100°c. what is the reading for the level of water on the graduations of the cylinder after the water and the cylinder reach thermal equilibrium with the bath? the volume coefficient of expansion of water is 2.07 x 10^-4 k-1, and the linear coefficient of expansion of aluminum is 23.0 x 10^-6 k-1. a) 305.0 cc b) 304.0 cc c) 303.5 cc d) 303.3 cc e) 304.5 cc

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.