Anew roller coaster contains a loop-the-loop in which the car and rider are completely upside down if the radius of the loop is

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?

The maximum wavelength of light required to eject an electron from zinc is 270nm. calculate the threshold frequency of zinc.