To apply the principle of superposition to overlapping waves, you should of the individual waves. a) add the wavelengths b) multiply the frequencies c) add the vector displacements d) add the frequencies sound travels at a speed of 344 m/s through air at 20°c. what is the second harmonic of an open pipe of length 1.40 m filled with air at 20°c? 123 hz 246 hz 492 hz 377 hz

Ais not a compound machine. a. bolt b. shovel c. handcart (dolly) d. see-saw (teeter totter)

Kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energy b. motion energy c. sound energy d. thermal energy

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p