At t0 rod a and rod b have the same length l0. however, when they are heated to a final temperature t f, rod a is longer than rod b by an amount d. derive an expression for the difference in the respective coefficients of linear expansion of the two rods, αa−αb.
express your answer in terms of the variables t0, t f, l0 and d.

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

What is the relationship between wavelength of light and the quantity of energy per photon?