All of the cells in your body are genetic clones of one another. however, you have about 290 different types of cells, such as skin, muscle and nerve cells. what causes these cells to look and behave differently from one another if they all contain the same genome.

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

Does heating a metal wire increase or decrease its electrical resistance? why?