Planck's formula for the "spectral density" ρ, that is, the energy per unit volume per unit frequency v, of blackbody radiation at absolute temperature t, is given by 8thu3 1 c3 eh/(kt)-1 where k is boltzmann's constant and h is planck's constant. show that the frequency vmaz at which the spectral density is maximum satisfies hwmez/(kt) constant, (kt) - as a function of t, where the constant is just less than 3 (hint: consider drawing a graph of of two curves to see the intersection point). can you determine the dimensionless constant more accurately?

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

In this lab you will use a cart and track to explore various aspects of motion. you will measure and record the time it takes the cart to travel certain distances, and then complete some calculations. in the space below, write a scientific question that you will answer by doing this experiment.