The speed of a wave on guitar string is 100/ms and the frequency is a 1000hz what is the wave length

Explain why electric current cannot exist if a current doesn't have a voltage source.

Explain what happens at the saturation point when adding salt to water at room temperature.

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.