If a star is 75 light years away, how long is it before we see the light from that star on earth ?

What are some important factors to consider when choosing a warm-up before your workout?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d

What will happen in a hybrid vehicle if current flow becomes too high due to a short?