PLZ HURRY!!WILL BE FRIEND FOREVER!!1. When an object is burning, two atoms of oxygen (in the air) combine with one atom of carbon (from the substance burning). This forms carbon dioxide gas. Explain how the law of conservation of matter applies to this reaction.

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Answer 1
Answer:

Answer:

When you burn 1 carbon, 2 atoms of oxygen will react with the carbon which forms carbon dioxide with 3 atoms. The law conservation applies since it states that mass can never be created nor destroyed. In simple terms, the amount used for the reaction should be the same amount produced.


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What is the acceleration of a vehicle that goes from 70 m/s to a stop in 35 s?

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u=70 , v= 0, t=35, a=?
v=u+at
0=70+a(35)
-70=35a
a=-2m/s^2
Decelerate 2ms^-2 or acceleration is -2ms^-2

If the minimum velocity of a projectile is double the minimum velocity,the angle of projection is

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This is a very clever and interesting exercise. I'm typing on a little telephone screen and it would take me a week to explain my reasoning, so I can only give my proposed answer. It's . . . 60 degrees above the horizon.

Which force changes Earth's surface most slowly?A) earthquake
B) erosion
C) volcano
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Explain what it mean to say that energy is conserved

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It really means that the total amount of energy in the universe is
a fixed number, and doesn't change.

So if you're watching what's going on in some fixed bottle, box, pot,
or other volume, 'conservation' means that no energy can magically
appear in the bottle or disappear from it.  The total amount of energy
can't change.  The energy can only move from one place to another. 
So if you see the amount of energy change inside there, then you
know that either some of the original energy must have leaked out
and escaped, or else more energy came in from somewhere.

This is actually a very powerful thing to know.  It helps solve a lot
of problems.

In an experiment,the group that is exposed to the variable to be tested is called

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Answer:

The group that is exposed to the variable to be tested is called as experimental group.

Explanation:

An experiment consists of two kinds of group. They are experimental group and control group. The working of control group and experimental group are mostly same except that the variables will be changed in experimental group, while it is kept constant in control group. So at the end of experiments, the results from control group and experimental group are compared and the final outcome has been derived. So the given statement where the group is exposed to the variable to be tested or the independent variable is called as experimental group.

A star has a size of 0.1 solar radius. How many times larger is the sun than this star?

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-- The sun's radius is 10 times the radius of that other one.

-- The sun's surface area is 100 times the surface area of that other one.

-  The sun's volume is 1,000 times the volume of that other one.