A circle of diameter d =25 cm is scribed onto an unstressed square of 40cm*40cm aluminum plate if thickness t= 2cm. Force are applied to the plate such that the stresses in the x and y directions are 85MPa ahd 140MPa. If aluminum has a Young's modulus E=70 GPa and a poisson ratio v = 0.33, determine.

1) The change in the length of the circle diameter AB.
2) the change in the length of the circle diameter CD.
3)The change in the thickness of the plate
4) The change in the volume of the plate

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 describes increasing the efficiency of energy resource

What difference are found in the propagation of sound in the media solid, liquid and gas