(1) If a 1 cm block is placed under one leg of the air-track, what is the tilt angle of the air-track

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Can you receive a shock severe enough to prevent you from releasing the wire from an ordinary outlet with dry hands? a. no b. yes explain