To determine a waves' frequency, you must know the a. distance it travels. b. number of oscillations in a given period of time. c. distance between the crest and trough. d. height of the wave.

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3

Need only answer if you think you know it

Dc versus ac problem. suppose your dc power supply is set to 15 v and the vertical setting on the oscilloscope is at 5 v/div. how many divisions will the trace deflect if you connect the output of the power supply to the scope with the a input switch set on dc? how many divisions if the switch is on ac?