(pls me) brainlest answer too 4.) heat is transferred through a piece of metal by conduction convection radiation 5.) heat from the sun travels to earth by conduction convection radiation 6.) energy in a vacuum travels by conduction convection radiation 7.) in a convection current a.) warm fluid sinks to replace cool fluid b.)warm fluid is more dense, and therefore, rises c.)cool fluid is more dense, and therefore, sinks d.)heat flows from cooler areas to warmer areas 8.) nuclear reactions occurring in the sun select all that apply. generate light generate heat absorb a lot of energy fuse atoms of hydrogen to make helium atoms 9.) which of the following statements is true? a.) temperature is an average measure of the heat energy in a substance. b.)the transfer of heat in a fluid does not require physical contact between molecules. c.)the sun's energy comes from the nuclear reactions of changing hydrogen into helium. d.)all of the above.ω∵

4.) Heat is transferred through a piece of metal by .
conduction

Conduction happens when both items are in close contact. In a piece of metal. In this case, the heat transfers gradually into the other ends of the object. This makes the transfer rate is slow on a long object with a low surface area.

5.) Heat from the sun travels to earth by .
radiation

Sun energy comes from a reaction that will produce a light and heat and it is transferred to the earth by radiation. While conduction and convection need contact with the object, radiation doesn't.  Radiation can travels a very long distance, that is why the heat could be delivered to the earth.


6.) Energy in a vacuum travels by ___.
radiation

One of the examples for energy travels in a vacuum would be sunlight. Sun and earth are separated by vacuum space which means there is no direct contact between earth and sun. That means conduction and convection are not possible.


7.) In a convection current .
C.)cool fluid is more dense, and therefore, sinks

Cool fluid have lower volume, thus become denser than warm fluid. Since its density higher than the warm fluid, it will sinks and moves toward the earth. The warm fluid also rises to replace the cool fluid.

8.) Nuclear reactions occurring in the Sun . Select all that apply.
generate light
generate heat
fuse atoms of hydrogen to make helium atoms

Sun is bright and hot, which means it produces light and heat. The reaction should be producing energy, not absorbing energy. The reaction that produces that energy would be the fusion reaction of hydrogen into helium.

9.) Which of the following statements is true?
C.)The sun's energy comes from the nuclear reactions of changing hydrogen into helium.
The sun reaction is right, it is forming helium using hydrogens.
Transfer of heat in liquid mostly happens because convection which need direct contact. But the heat can transfer by radiation too, so its a bit ambiguous.
Temperature represents the average kinetic energy of the molecule and it is different with heat/thermal energy.