What is the luminosity of a star having 6 times the radius of the sun and a surface temperature of 15000 k ?

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states

Which of these activities increases the amount of carbon in the atmosphere?