Pick the two correct statements.
a curtain blind uses a wedge.
b. a bicycle uses a wheel and axle.
c. a seesaw uses a lever.
d. an axe uses a pulley.

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?