A star with obvious Hydrogen lines in its spectrum is moving relative to the Earth. A Balmer Alpha line is clearly visible from its absorption spectrum and is measured to have a wavelength of 654.3 nm.
a. How fast is the star radially moving in relation to the earth? Show your work!

Which of the following changes to a pipe would increase the conductance by a factor of 12? 1.quadrupling the length and tripling the radius.2.reducing the length by a factor of and doubling the radius.3.tripling the length and reducing the radius by a factor of .4.reducing the length but a factor of and doubling the radius.

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

Aquantity of gas has a volume of 1.5 m3 and an absolute pressure of 95 kpa. when the gas is compressed to a volume of 0.5 m3, what is the new absolute pressure of the gas? (assume that there’s no change in temperature.)