Asound-producing object is moving away from an observer. the sound the observer hears will have a frequency that actually being produced by the object.

the same as

higher than

lower than

need !

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.