Acup of hot water cannot melt a large block of ice. however, the same block melts when dropped into a lake. this is because
a) the lake is at a lower temperature than the cup of hot water.
b) the lake is at a higher temperature than the cup of hot water.
c) the lake contains less mass and heat than the cup of hot water.
d) the lake contains more mass and more heat than the cup of hot water.

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

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.

Regarding the history of the universe, which of the following is true? all the chemical elements were created during the big bang, but some have been modified since that time as a result of radioactive decay. the earth formed quickly after the big bang. all the current stars in our galaxy formed about the same time billions of years ago. key elements of which earth and life are made, including carbon, oxygen, and iron, did not exist when the universe was born and were created later in stars.