Calculate the potential energy of a rock with a mass of 55kg while sitting on a cliff that is 27 m high

What best explains the inability for life to exist in earth early atmosphere

One of the reasons that stars are so large is because

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.