Acollege friend of yours who has been postponing taking any science courses hears you talking about the generation of nuclear energy in the sun and makes the following observation: "the whole idea of the atomic nucleus is pretty ridiculous. if an oxygen nucleus consists of eight protons and eight neutrons, the charge on that nucleus is positive. since even i learned in high school that like charges repel, such a nucleus would find all its positive protons repelling and quickly fall apart." how would you answer his argument?

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

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?