The focal length of David's lens is 40 cm. If Rebecca stands in front of David at a distance of do and David perceives the position of Rebecca at di, what does do equal if the magnification is -0.45

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Which accounts for an increase in the temperature of a gas that is kept a constant volume

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?