11.(very challenging) during a 12 hour period, a tree lifts 50 kg of water a distance of 5 m from its roots to its leaves. finda) the amount of work done by the tree andb) the amount of power required for this process. c) if the tree’s power could be harnessed to run electric appliances, how many trees would it take to power a house that uses 30 kwh in that same 12 hour period

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.

What practical value did astronomy offer to ancient civilizations?