Lake Mead, the reservoir above Hoover Dam, has a surface area of approximately 640 km2. The top 1 meter of water in the lake weighs about 6.3 x 1012 N. The dam holds that top layer of water 220 m above the river below, What is the potential energy of the top 1 m of water in Lake Mead. Group of answer choices

140800 j

2156 j

1.38 x 10^15 j

14367.3 j

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

What happens when chlorine reacts with bromine? a. electrons move from the chlorine atoms to the bromine atoms. b. electrons move from the bromine atoms to the chlorine atoms. c. electrons are shared between the chlorine atoms and the bromine atoms. d. electrons become delocalized among the atoms.

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.