When you double the frequency of a sound A. it is twice as loud
B. it is half as loud
C. it sounds an octave higher
D. it does not change what you hear

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance. what is its vertical displacement (in m) after 6 s?

The substances that are necessary for producing of certain hormones and that store and transport vitamins

Me pl 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.