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kompoz [17]
2 years ago
14

According to the law of conservation of matter, which statement about chemical reactions is true?

Physics
1 answer:
satela [25.4K]2 years ago
4 0

The correct answer is:

Atoms cannot be created or destroyed by chemical reactions.

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Which example best describes mechanical advantage?. A) A fixed pulley changes the direction that you pull. B) Greasing a surface
Jet001 [13]
Needed to be pointed out that mechanical advantage is when the distance traveled is traded for force applied

from the following options, the one that is considered a mechanical advantage is : C. a longer lever helps lift more weight

hope this helps
4 0
2 years ago
Read 2 more answers
What is the difference between beta plus and minus
Minchanka [31]
Beta decay is very complex phenomena in natural radioactive decay. There are 3 types of Beta decay.

B+ decay (Beta plus or Beta positive or positron decay):

is the conversion of a proton into a neutron plus a positron and an electron neutrino.

B- decay (Beta negative or Beta nought):

is the conversion  of a neutron into a proton plus an electron and a electron antineutrino. 

Note: a positron is the a positive electron or the antiparticle of the electron.

Hope it helps
7 0
2 years ago
A long uniform board weighs 52.8 N (10.6 lbs) rests on a support at its mid point. Two children weighing 206.0 N (41.2 lbs) and
natima [27]

The upward force exerted on the board by the support is 530.8 N.

<h3>Upward force exerted on the board by the support</h3>

The sum of the upward forces is equal to sum of downward forces;

total downward forces = 52.8 N + 206 N + 272 N = 530.8 N

downward force = upward force = 530.8 N

Thus, the upward force exerted on the board by the support is 530.8 N.

Learn more about upward force here: brainly.com/question/6080367

#SPJ1

8 0
1 year ago
Which of the following is true about conduction? Question 2 options: It is heat transfer through direct contact It can only occu
kramer

Answer:

through direct contact

Explanation:

took the test!

3 0
3 years ago
Can someone help me on no. 6
liq [111]

Efficiency = (energy that does the job) / (total energy used)

               =                               (45 J)  /  (120J)

I think you can handle the division.

8 0
2 years ago
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