Question

Which of the following is true about kinetic energy?
A. As an object's speed increases, kinetic energy decreases.
B. Only moving objects have kinetic energy.
C. Kinetic energy increases as an object's height increases.
D. Kinetic energy depends on an object's mass.

Answer 1

Pls help me.... Im stuck on this one question for physics, but its hard to understand. If some one could explain to me

Answer 2

Anyone?

Answer 3

Probably more a physics question than a biology one, but since kinetic energy=½ mv², I would say that it depends on an object's mass

Answer 4

Ok..... I thought I put physics

Answer 5

Ty

Answer 6

Is there anyway you can help me with a couple more questions?

Answer 7

I dont know if there correct, so can you check them for me?

Answer 8

Letter "A" is not necessarily true all the time.
Letter "C" describes potential energy.
Letter "D" is correct but not complete. Kinetic energy doesn't depend only on an object's mass but also in its velocity.

Therefore it leads us to the answer "B."

Answer 9

Oh ok

Answer 10

Can you check a few questions to see if there correct?

Answer 11

Which of the following best describes renewable energy?
A. It can be replaced as fast as it is used.
B. It takes thousands of years to form.
C. It replenishes slowly.**
D. People have a heavy reliance upon it for their energy needs.

Answer 12

Approximately how many times greater is oil production in 2010 than it was in 1950?
A. 5
B. 10
C. 15
D. 20**

Answer 13

Well, renewable energy is definitely A

Answer 14

Letters "B", "C", "D" all describes fossil fuels or what we call the non-renewable resources.

The answer is "A."
'

Answer 15

ok

Answer 16

Then one last question....

Answer 17

and since it is asking for "times," and 1950 was ~4 while 2010 was ~25, the answer should be 25/4

Answer 18

Whats an advantage and disadvantage of nuclear energy?

Answer 19

There is no 25/4 answer

Answer 20

Usually they round the answers

Answer 21

I think it should be 21 for the difference between them, but 20 is the closest

Answer 22

well, it's "times" right? I think times means multiplication, not addition

Answer 23

Yea, 4 times would be answer then..... So that means 5 is the answer?

Answer 24

I think so, and as for nuclear energy, think air pollution vs. Chernobyl

Answer 25

hmmm

Answer 26

Air pollution in major cities may be more damaging to health than the radiation exposure suffered by survivors of the 1986 Chernobyl disaster..... That's what that is, so how am I suppose to make it advantage and disadvantage?

Answer 27

Advantage- air pollution in major cities is a chronic problem, that may be reduced by closing down fossil fuel factories and opening nuclear facilities instead.
Disadvantage- though over a long period of time, nuclear energy produces less air pollution, if an accident were to occur (such as Chernobyl, Fukushima or the Three Mile Island), than it could cause widespread acute exposure to radiation

Answer 28

Oh ok..... Thank you for helping me :)

Answer 29

Your welcome :)

Answer 30

Advantages

a) The Earth has limited supplies of coal and oil. Nuclear power plants could still produce electricity after coal and oil become scarce.
b) Nuclear power plants need less fuel than ones which burn fossil fuels. One ton of uranium produces more energy than is produced by several million tons of coal or several million barrels of oil.
c) Coal and oil burning plants pollute the air. Well-operated nuclear power plants do not release contaminants into the environment.

Answer 31

Disadvantages
a) Nuclear explosions produce radiation. The nuclear radiation harms the cells of the body which can make people sick or even kill them. Illness can strike people years after their exposure to nuclear radiation.

b) Nuclear reactors also have waste disposal problems. Reactors produce nuclear waste products which emit dangerous radiation.

c) One possible type of reactor disaster is known as the "meltdown." In such an accident, the fission reaction goes out of control, leading to a nuclear explosion and the emission of great amounts of radiation.