Aguitar string vibrates with a frequency of 256hz. what is the period of vibration

What is the role of the ocular lens?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy