If an astronomical light source were moving toward us, then what would be observed?
(a) a blue shift
(b) a shift toward longer wavelengths
(c) a shift toward lower frequencies
(d) a sonic boom

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final