Which of the following is the best example of potential energy?
question 1 options:
a ball sitting at the top of a hill
a ball sitting at the bottom of a hill
a ball rolling down a hill
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question 2 (1 point) question 2 unsaved
which of the following is an example of kinetic energy?
question 2 options:
a girl running in a race
a car sitting motionless
a tank containing gasoline
a sled sitting at the top of a hill
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question 3 (1 point) question 3 unsaved
the water held by a dam is an example of which type of energy?
question 3 options:
kinetic energy
chemical energy
electrical energy
potential energy
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question 4 (1 point) question 4 unsaved
what does the kinetic theory explain?
question 4 options:
heat is due to pascal´s principle.
heat is due to temperature.
heat is due to potential energy.
heat is due to the motion of molecules.
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question 5 (1 point) question 5 unsaved
if the atoms and molecules of a substance are moving very fast, the substance is
question 5 options:
porous
cold
hot
frozen
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question 6 (1 point) question 6 unsaved
heat energy is measured indirectly by
question 6 options:
temperature
kinetics
recording the motion of molecules
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question 7 (1 point) question 7 unsaved
what are the ways that heat moves?
question 7 options:
heat only moves through air currents.
heat moves through conduction, convection, and radiation.
heat only moves through conduction and radiation.
heat moves from a cold object to a warm object.
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question 8 (1 point) question 8 unsaved
convection requires to transfer heat.
question 8 options:
the vacuum of space
fluids (liquids or gases)
insulation
solids
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question 9 (1 point) question 9 unsaved
what does an insulator do?
question 9 options:
an insulator slows heat transfer.
an insulator cools a substance.
an insulator warms a substance.
an insulator emits electromagnetic radiation.
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Question 1

Which of the following is the best example of potential energy?

ANSWER

a ball sitting at the top of a hill

EXPLANATION

As we know that Potential Energy is given by

U = mgh

so as height will be more more is the potential energy

Question 2  

Which of the following is an example of kinetic energy?

ANSWER

a girl running in a race

EXPLANATION

As we know that Kinetic Energy is given by

So more speed means more kinetic energy

Question 3

The water held by a dam is an example of which type of energy?

 ANSWER

potential energy

EXPLANATION

As we know that Potential Energy is given by

U = mgh

Since water is at rest so its energy is Potential Energy

Question 4

What does the kinetic theory explain?

 ANSWER

Heat is due to the motion of molecules.

EXPLANATION

As the molecules of medium is in motion so it shows energy transfer which is also known as HEAT

Question 5

If the atoms and molecules of a substance are moving very fast, the substance is __________.

 ANSWER

Hot

EXPLANATION

Since heat is the measure of motion of molecules so here since molecules are moving fast then temperature must be more

Question 6 (1 point)

Heat energy is measured indirectly by __________.

 ANSWER

Recording of motion of molecules

EXPLANATION

Since heat will show the speed of molecules so motion of molecules is represented by heat.

Question 7

What are the ways that heat moves?

 ANSWER

Heat moves through conduction convection and radiation

EXPLANATION

There  are three ways of thermal energy transfer

conduction, convection, and radiation.

Question 8

Convection requires __________ to transfer heat.

 ANSWER

As the molecules of medium is in motion so it shows energy transfer which is also known as HEAT

EXPLANATION

In convection mode of heat transfer the molecules will move and carry heat along with them.

Question 9

What does an insulator do?

 ANSWER

An insulator slows heat transfer.

EXPLANATION

Thermal insulator stops the flow of heat through them and complete slow down of heat

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

like poles repel so keep pushing north to north and repels funny to see this