There are free body diagrams in the picture, number (#). which of the diagram(s) shows an object at rest on a table? 2 and 3 3 only 2 and 4 2 only

Explain what happens at the saturation point when adding salt to water at room temperature.

Derive the lens makers formula for convex les?

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?