(NO LINKS :D When there are equal forces from opposite directions acting on an object, the forces are said to be which of the following?

A} Positive
B} Negative
C} Balanced
D} Gravitational

Apiano tuner uses a tuner to create a tone of 5.00 x 10² hz. when a key on the piano is struck he hears 5 beats per second. what is a possible frequency of vibration for the piano string? 2500 hz 1300 hz 605 hz 495 hz

What are the three ways that an object can accelerate

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