60 points and brainliest!
which segments show changes of state that absorb heat?
b-c
c-d
d-c
d-e
e-f

B-C and D-E  

Explanation:

In segment B-C the substance is changing from a solid to a liquid (melting). There is no change in temperature because the heat is being used to separate the particles from the solid and move them into the liquid phase.

In segment D-E the substance is changing from a liquid to a gas (boiling). There is no change in temperature because the heat is being used to separate the particles from the liquid and move them into the gas phase.

C-D is wrong. The liquid is being heated from its melting point to its boiling point.

D-C is wrong. The liquid is being cooled from its boiling point to its melting point.

E-F is wrong. It represents heating of the gas.

During the 1800s. hope this !

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction