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Simora [160]
3 years ago
6

Which has more mechanical energy, a box on the top shelf of a closet or a box of equal mass on the floor? The box on the floor h

as more mechanical energy because work has been done on it. The box on the shelf has more mechanical energy because it is higher above Earth's surface. They have the same mechanical energy. There is not enough information to know.
Chemistry
2 answers:
denis-greek [22]3 years ago
8 0

the box on the shelf is right:)

Ksju [112]3 years ago
4 0

Answer: B: The box on the shelf has more mechanical energy because it is higher above Earth's surface.

Explanation:

cause its right :)

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As methane burns, it reacts with oxygen and forms carbon dioxide and water. The balanced chemical equation below models this che
Elan Coil [88]

Explanation:

hope this helps please like and mark as brainliest

3 0
3 years ago
I NEED HELP ON THIS WORTH 20 POINTS :)
Arturiano [62]

Answer: C. mollusca and arthropoda

                                                                           

Explanation:

4 0
2 years ago
Read 2 more answers
Give the o.N. Of each of the elements magnesium and oxygen in the reactants and in the products 2Mg + O2=2MgO
vlada-n [284]

Answer:

2Mg^0 + O_2^0\rightarrow2Mg^{2+}O^{2-}

Explanation:

Hello there!

In this case, according to the rules for the oxidation states in chemical reactions, it is possible to realize that lone elements have 0 and since magnesium is in group 2A, it forms the cation Mg⁺² as it loses electrons and oxygen is in group 6A so it forms the anion O⁻²; therefore resulting oxidation numbers are:

2Mg^0 + O_2^0\rightarrow2Mg^{2+}O^{2-}

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4 0
2 years ago
A sample of vinegar was found to have an acetic acid concentration of 0.8846 m. What is the acetic acid % by mass? Assume the de
jenyasd209 [6]

Answer:

5.3%

Explanation:

Let the volume be 1 L

volume , V = 1 L

use:

number of mol,

n = Molarity * Volume

= 0.8846*1

= 0.8846 mol

Molar mass of CH3COOH,

MM = 2*MM(C) + 4*MM(H) + 2*MM(O)

= 2*12.01 + 4*1.008 + 2*16.0

= 60.052 g/mol

use:

mass of CH3COOH,

m = number of mol * molar mass

= 0.8846 mol * 60.05 g/mol

= 53.12 g

volume of solution = 1 L = 1000 mL

density of solution = 1.00 g/mL

Use:

mass of solution = density * volume

= 1.00 g/mL * 1000 mL

= 1000 g

Now use:

mass % of acetic acid = mass of acetic acid * 100 / mass of solution

= 53.12 * 100 / 1000

= 5.312 %

≅ 5.3%

3 0
3 years ago
a book with a mass of 1 kg is dropped from a height of 3 m. what is the potential energy of the book when it reaches the floor?
mafiozo [28]
Well, first of all, the formula for finding potential energy is;
PE=mgh
  Where; m is the mass
               g is the gravitational force or acceleration due to gravity
                h is the height. 
   Anyway, according to the question, the mass is 1kg, the acceleration due to gravity has a constant value of 10ms² . And the height is 3m. Now you just have to use all these in the formula. So;
mgh= 1 x 10 x 3. That will be 30. And the unit of potential energy is Joule. So the answer is 30 joules. Hope i helped. Have a nice day.     
5 0
3 years ago
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