PHYS 103 Midterm: physics test 2
Document Summary
We need to look everywhere to ensure that we can account for all of the energy. Energy is stored in fuels (chemicals), energy can be stored by lifting objects (potential energy), moving objects carry energy (kinetic energy), electric current carries energy, light (other forms of radiation) carries energy, heat carries energy, & sound carries energy. E(cid:374)e(cid:396)g(cid:455) is (cid:374)ot a (cid:396)eal thi(cid:374)g, it"s a (cid:373)athe(cid:373)ati(cid:272)al (cid:272)o(cid:374)(cid:272)ept, (cid:272)o(cid:373)pletel(cid:455) (cid:272)o(cid:374)siste(cid:374)t (cid:449)ith (cid:374)e(cid:449)to(cid:374)"s la(cid:449)s and equations of motion. It allows us to see that some number (calculated according to other manifest changes speed, mass, temperature, position) remains constant before and after and after some (cid:862)e(cid:448)e(cid:374)t(cid:863) o(cid:272)(cid:272)u(cid:396)s. You can think of a wave as a traveling disturbance, capable of carrying energy with it: light waves can have energy (like solar energy) ocean waves can also carry energy. The unit is the cycle per second (hertz, hz: wave speed (v): the rate at which the wave travels.
