Question

Help me in Science anyone :(

Answer 1

Which statement best describes heat and thermal energy?

They are different words for the same thing.
They represent different concepts.
Heat is what happens when thermal energy stops moving between substances.
Thermal energy is what happens when heat moves between substances.

Answer 2

@JustSaiyan

Answer 3

waiting for like 30minutes for this crap to be answered

Answer 4

Which best contrasts hydroelectric power and geothermal energy?

Turbines are used in power plants that harness only geothermal energy but not hydroelectric power.
Turbines are used in power plants that produce hydroelectric power but not geothermal energy.
In the US, geothermal energy is a more widely used energy source than hydroelectric power.
In the US, hydroelectric power is a more widely used energy source than geothermal energy.

Answer 5

@JustSaiyan do you know this

Answer 6

The first is D. The second is B.

Answer 7

Geothermal heating just isn't used as much. The most used are Hydroelectric, Solar, and Wind.

Answer 8

ok thanks

Answer 9

You'e welcome.

Answer 10

Which electrolyte is used in an alkali fuel cell?
a high-temperature carbonate salt mixture
a solid polymer
a solid ceramic metal oxide compound
an aqueous potassium hydroxide solution

Answer 11

D

Answer 12

Mintu wants to increase the heat transfer between a metal iron and another piece of metal he wants to shape. He decides to increase the time the two metals are in contact, use a larger metal iron, and use a new metal material with a higher specific heat.

Where is Mintu's error?

Mintu should have decreased the size of the metal iron.
Mintu should have decreased the time he touches the two metals.
Mintu should have chosen a material with a lower specific heat.
Mintu should have chosen a material the same temperature as the iron.

Answer 13

Hmm. A I think.

Answer 14

Which shows the correct order of steps when using natural gas to generate electricity?

Energy is converted → gas is burned → boiling water makes steam → steam turns turbines
Gas is burned → boiling water makes steam → steam turns turbines → energy is converted
Boiling water makes steam → steam turns turbines → energy is converted → gas is burned
Steam turns turbines → gas is burned → energy is converted → boiling water makes steam

Answer 15

@JustSaiyan

Answer 16

B.

Answer 17

Jaden listed the similarities of using coal, natural gas, and petroleum to generate electricity.

Coal, natural gas, and petroleum:
– use turbines
– require heat
– convert electrical energy to kinetic energy
– produce pollution in the form of smoke

Which best describes Jaden’s mistake?

Only coal-fired power plants use turbines.
Power plants do not require heat.
Kinetic energy is converted to electrical energy.
Coal does not produce pollution.

Answer 18

Mohammed listed the steps that occur when a solar cell generates electricity.

1: Solar energy is absorbed by the cell.
2: Free electrons move to the front of the cell.
3: Electrons begin to move.
4: Electrons flow as electricity.

Which best explains how to correct Mohammed’s error?

Switch steps 2 and 3.
Switch steps 3 and 4.
Move step 1 to appear after step 4.
Move step 4 to appear after step 1.
One more <3

Answer 19

The first is C. the second is A

Answer 20

Thanks so much

Answer 21

You're welcome.

Answer 22

Which best describes the relationship between the terms “frequency,” “wavelength,” and “hertz”?

Wavelength is the number of frequencies, which is measured in hertz.
Frequency is the number of wavelengths, which is measured in hertz.
Wavelength is measured from frequency to hertz.
Frequency is measured from wavelength to hertz.

Answer 23

C if i am not mistaken.

Answer 24

Julia performs an experiment to measure the wavelength of four different waves and records her data in the table below.



Which accurately ranks the waves from the lowest energy wave to the highest energy wave?

1 → 4 → 3 → 2
2 → 3 → 4 → 1
3 → 2 → 4 → 1
1 → 4 → 2 → 3

Answer 25

Can you post the data table?