If the farmer were to use dry firewood with an average energy density of 16 MJ/kg, how many kilograms of wood would the farmer need to use to raise the water in the drum by the same amount as in (b)?

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals

Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane