When a table tennis ball on a thread is made to touch the vibrating prong of a tuning fork the ball swings backwards and forwards. How can this demonstration be used to explain how sound waves are made?

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

If the new moon happens on january 15th, what shape will it be on february 6th?