Scientists are making plans to put a probe in orbit around earth. they want the probe to enter the orbit shown below.

which arrow shows the direction that the probe should be moving in order for it to enter the orbit?

w

x

y

z

The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?