Suppose a mechanical wave is traveling through medium A. When the wave enters medium B, it speeds up. Which of the following statements is true about medium A and medium B? The answers:
A. Medium A is a solid and medium B is a gas.
B. Medium A is a liquid and medium B is a solid.
C. Medium A is a gas and medium B is a vacuum.
D. Medium A is a vacuum and medium B is a liquid.

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_