Why is there a proportionality constant in the heat equation? dT/dt = k * d^2T/dx^2
With k being the proportionality constant.

The earth is constantly spinning on its axis, like you might spin a basketball on your finger. it is this spinning of the earth that causes

What are similarities and differences between refraction, reflection, diffraction and absorption?

Use the information presented in the graph to answer the questions. which segments show acceleration? which segment indicates that the object is slowing down? what is the velocity of segment b? what is the acceleration of segment b?