12 POINTS! - Sam turns his bicycle upside down and turns the pedals fast so that the back wheel spins.
Sam holds a piece of card close to the back wheel. The spokes (metal lines) hit the piece of card and Sam hears a musical tone.
Explain why the card produces a musical tone.

When the spokes hit the piece of card, the wheel slows down.
Describe the energy change which occurs as the wheel slows down.

Describe and explain what will happen to the pitch of the musical tone as the wheel slows down.


If you don't understand the question then please do not put a random answer for points. Thank you!

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.