PLS HELP !2 Homework questions

[Questionnaire]

1. A ball has less energy at the end of the bounce than it had at the beginning why ?

A. Energy is lost

B.The energy transfers to heat

C.energy is missing

D.Energy transferred back to owner

2. A paper clip is put in water and there's air on top of it and they're all in a close test tube . Can air get to the paper clip ?

3.A paper clip that is covered with grease is put into a close test tube filled with air . Can it rust and can air get to the paper clip ?

 

PLEASE EXPLAIN YOUR ANSWERS REGARDING QUESTION 1 THANKS!!!!

[Sriman Dutta]

1. Something to do with dissipation of energy

 

 

2. HINT: How fishes breathe? From where they get oxygen in an aquarium if there's no aquatic plants?

 

3. What are the conditions for rusting ?

[Questionnaire]

1. Something to do with dissipation of energy

 

 

2. HINT: How fishes breathe? From where they get oxygen in an aquarium if there's no aquatic plants?

 

3. What are the conditions for rusting ?

Thanks for your reply !

1. A

2.Yes

3.Id say it won't rust and air can't get to it because it's covered with grease .

 

Correct ?

[Sriman Dutta]

Yes, it won't. The coating of grease would prevent it's contact with air, thereby nullifying the possibility of rusting.

[CuriousStudent]

Question #1 can be solved if you think of yourself throwing the ball. Throwing the ball itself creates energy, so when it hits the ground it will lose ____? (HINT: Although energy can create heat, you have to consider that the ball did not create friction)

Question #2 - Air tends to "reach out and grab surfaces"

Question #3 - Grease acts as a lubricant

 

I know this was already answered, but just in case you needed extra reasoning

Correction on myself. Friction can generate* heat not create