knewton alta 38

Which of the following is an example of kinetic energy?

a stretched spring in a pinball machine a rollercoaster at the top of the track a yo-yo before it is released a river flowing answer: a river flowing

As an object falls towards the earth, which kind of energy is being transformed into which other kind of energy?

kinetic into mechanical potential into heat heat into kinetic potential into kinetic answer: potential to kinetic

Which of the following is an example of an endothermic process?

melting ice cubes burning sugar a candle burning condensation of rain from water vapor answer: melting ice cubes

Which of the following is an example of an exothermic process?

a candle burning melting ice cubes water evaporation baking bread answer: a candle burning

A cold pack utilizes what kind of reaction to cool your skin?

exothermic endothermic expanding contracting answer: endothermic

When an object's temperature _______, it contracts.

increases remains constant decreases none of the above answer: decreases

When a substance undergoes a chemical reaction in an isolated system, which of the following will NOT change for the system? (select all that apply)

temperature energy density mass answer: energy and mass

What is work, in a scientific context?

the process of causing matter to move against an opposing force the absolute motion an object possesses the capacity to supply heat the flow of temperature in an object answer: the process of causing matter to move against an opposing force