Which of the following is a circuit component whose function includes changing an open circuit to a closed circuit? A. wire
B. switch
C. power source
D. load

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?