Areal object is -20 cm from the first focal point of a system consisting of two thin lenses and produces a real image 45 cm from the second focal point. if the focal length of the first lens is +12.5 cm, and the lenses are separated by 4 cm, find the power of the second lens. x--02d m t1ー /t. r25=-8.dd d f=±0.3d m, and sw. tis system -637 d r.- fenutbe positive

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.

Which best describes the difference between internal and thermal energy?

Aspacecraft that renters the earth’s atmosphere drastically slows down. the amount of kinetic energy the spacecraft has as it reenters the earths atmosphere