When a sound source approaches you, the pitch you hear is
a. higher than when the source is stationary.
b. first higher and then lower than the pitch of the source when stationary.
c. the same as when the source is stationary.
d. lower than when the source is stationary.

Can anybody me with this? ? (picture included.)

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?

Estimate the change in the gibbs energy and molar gibbs energy of 1.0dm3 of octane when the pressure acting on it is increased from 1.0 atm to 100 atm. the mass density of octane is 0.703 g cm−3