Which of the following is not a problem with open fireplaces? a. not all of the available energy is extracted from the fuel. b. toxic gases are released as the fuel burns. c. radiant heat is released. d. smoke and dust particles pollute the air.

The speed of light can be used to measure the

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?

Is a copper wire a conductor or insulator?