Show graphically that the particle executing shm have an acceleration ahead of it's displacement​

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

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?

Ln finding the density of liquid why is the method of using a density bottle more accurate than the one of using a measuring cylinder