A 2 C charge and a 4 C charge attract each other with 10 N of force How much will a 2C charge and a 8 C charge attract each other when placed the same distance apart? 10 N

8 N

40 N

20 N

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Need only answer if you think you know it