The law of conservation of energy states that energy can neither be created nor destroyed; however, if you stretch out a ball in your hand and let it freely drop, the ball will not quite bounce back up to the height you dropped it from. Which of the following best explains why this happens? *
The pull of gravity negates the law of conservation of energy.

Some of the energy has to be used up to push the ball back into the air, destroying it forever.

The ball falls too quickly, so the energy does not have enough time to fully recharge.

Some of the energy is released into the air as heat (thermal energy) due to friction.
which answer is it? help

Answer:

Polymerase Chain reaction is a method used by scientists to making A LOT (millions to billions) of copies of a DNA sample which then allows scientists to take a small of that DNA and increase the amount to a very large amount to study the DNA into further detail.

Polymerase Chain Reaction (PCR)

   Polymerase chain reaction (PCR) is a technique for replicating or copying a specific portion of a DNA strand; leads to millions of copies of the DNA segment technique for replicating or copying a specific portion of a DNA strand; leads to millions of copies of the DNA segment.

Answer:

a thing that is composed of two or more separate elements; a mixture.

Explanation:

The given reaction can be balanced as follows: CaC2 + 2H2O → Ca (OH)2 + C2H2. Grams of water required to completely react with 82.4 g of CaC2 is 46.28 g.

What is a balanced reaction?

In balanced reaction, the number of each and every element on both side is balanced. In the given reaction to balance the number of H and O, add 2 to H₂O so that, all the species will be equal in number on both side.

Now, as per the balanced reaction, 2 moles of water is required to reacts with 1 mole of CaC2.

Mass of one mole of water = 18 g/mol.

                                   2 mole = 36 g

Mass of one mole of CaC2 = 64.09 g/mol

Thus 36 g of water is required to react with 64.09 grams of calcium carbide. Mass of water required to react with 82.4 g of calcium carbide is calculated as follows:

Mass of water = (36 g×82.4 g)/64.09 g = 46.28 g

Hence, 46.28 grams of water is required to completely react with 82.4 g of calcium carbide.

To learn more about calcium carbide, please refer the link.      

https://brainly.com/question/1581618

  #SPJ5

Answer:

Nothing can be zero, but zero isn't nothing. If someone asks you if you have money and you say "I've got nothing!" when you actually don't have a cent, then you have zero money. However, zero is a number, so it itself is something, therefore more than nothing. So technically, you do have something.

When zero is on a number line, you could classify it as nothing, but it is the number between 1 and -1. Hypothetically speaking, if you took the zero away, wouldn't the number line be the same?

Zero isn't positive or negative. The number zero on a graph, or in a coordinate can tell you where something is. Zero can be a word to describe if something is existent, or non-existent.

Okay, my brain hurts.

Answer:

environmentalism I think

Explanation:

...................

Answer:

2nd choice answer

Explanation:

thats ez tbh

Answer:

1.375%

Explanation:

Percent Error = measured value - accepted value/ accepted value x 100

Measured Value: 15.78

Accepted Value: 16.00

Work:

[tex]\frac{15.78-16.00}{16.00}[/tex] * 100

[tex]\frac{-.22}{16}[/tex] * 100 = -1.375

You cannot have a negative percentage. Therefore the answer is 1.375%

Answer: This means that the answer can be proven wrong.

Explanation:

Hope this helps!!

Answer:

is means it can be proven false

this is the answer

sorry if the answer is wrong

Answer:

Observational

Explanation:

This is the answer because researchers or scientist observe the effect of a  diagnostic test, treatment or other intervention without trying to change anything.

Answer:

72 Newton

Explanation:

force=mass x acceleration due to gravity

Force applied on object is 72 Newton​

Given that;

mass of thing = 6 kg

Acceleration = 12 m/s²

Find:

Force applied on object

Computation:

Force = mass × acceleration

Force applied on object = 6 × 12

Force applied on object = 72 Newton​

Learn more:

https://brainly.com/question/19734564?referrer=searchResults

The net ionic equation for the acid-base reaction of hydrochloric acid with phosphine is PH3(aq) + H⁺(aq)  → PH⁺₄ (aq)

A chemical reaction shows us how substances interact which brings about  changes in the  composition of the  reactants. Two types of Chemical reactions includes:

The net ionic equation of a  chemical equation tells us only elements and ions directly involved in the chemical reaction.

Now for the reaction of hydrochloric acid, HCl with phosphine, PH3,

First write the aqueous substances in their ionic components

PH3(aq) + HCl(aq)→ PH4Cl(aq)

PH3(aq) + H⁺(aq) +Cl⁻(aq) → PH⁺₄ (aq) + Cl⁻(aq)

Then we  remove the ions that do not take part in the reaction,  Cl⁻(aq)

So we are left with

PH₃(aq) + H⁺(aq)  → PH⁺₄ (aq)

Therefore, the net ionic equation for the reaction of hydrochloric acid with phosphine is PH₃(aq) + H⁺(aq)  → PH⁺₄ (aq)

Learn more on Net ionic equation here:https://brainly.com/question/20488944

Answer:

The answer is

Explanation:

The acceleration of an object given it's mass and it's net force can be found by using the formula

[tex]acceleration = \frac{force}{mass} \\ [/tex]

From the question

force = 60 N

mass = 12 kg

So we have

[tex]acceleration = \frac{60}{12} \\ [/tex]

We have the final answer as

Hope this helps you

Answer: physical change

Explanation:

as the water heats up the atoms begin to move faster changing the physical form

Answer: ending results

Explanation:

Answer:

Mixture

Explanation:

A mixture is defined as a material formed from the combination of two or more different substances.

Jet fuel is a mixture of hydrocarbons including crude oil petroleum and kerosene or gasoline. Jet fuels are made by the process of refining and blending of different petroleum and kerosene.

Hence, the correct option is "Mixture".

Answer:

Tellurium

Explanation:

Technetium's position on the periodic table is 43 and Tellurium's is 52

climate changing a

nodvnfosdjfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfvhnfv

its a

Answer:

Climate change

Answer:

Fish is the best time to go

Explanation:

Chicken nuggets and a salad and some onion rings and a new charger

Answer:

One way creativity is helpful to scientists is when they need to come up with a experiment or cure for something their imaginastion is very helpful. The reason for that is with creativity they could get answers much quicker!

Explanation:

Answer:

I agree with that answer

Answer:

septembar 9 2003

Explanation:

he died in september 9 2003

Answer:

Your answer:

His cause of death was a stroke ( heart attack)

hope this helped you

please mark as the brainliest (ㆁωㆁ)

Answer:

A. 8.8 g.

B. 5.3 g.

C. 449 g.

Explanation:

A. Determination of the mass of CO2.

Mole of CO2 = 0.2 mole

Molar mass of CO2 = 12 + (2×16)

= 12 + 32

= 44 g/mol

Mass of CO2 =?

Mole = mass /Molar mass

0.2 = mass of CO2 /44

Cross multiply

Mass of CO2 = 0.2 × 44

Mass of CO2 = 8.8 g

B. Determination of the mass of Na2CO3.

Mole of Na2CO3 = 0.05 mole

Molar mass of Na2CO3 = (2×23) + 12 + (3×16)

= 46 + 12 + 48

= 106 g/mol

Mass of Na2CO3 =?

Mole = mass /Molar mass

0.05 = mass of Na2CO3 /106

Cross multiply

Mass of Na2CO3 = 0.05 × 106

Mass of Na2CO3 = 5.3 g

C. Determination of the mass of Fe(OH)2.

Mole of Fe(OH)2 = 5 moles

Molar mass of Fe(OH)2 = 55.8 + 2(16 + 1)

= 55.8 + 2(17)

= 55.8 + 34

= 89.8 g/mol

Mass of Fe(OH)2 =?

Mole = mass /Molar mass

5 = mass of Fe(OH)2/89.8

Cross multiply

Mass of Fe(OH)2 = 5 × 89.9

Mass of Fe(OH)2 = 449 g.

Answer:

296

Explanation:

Tk = ºC + 273

Tk = 23 + 273

T = 296 K

Please refer to the attachment!

Hope it will help u,

Answer:

0.000056g

Explanation:

1 mg = 0.001 g

Or if it helps move your decimal sign over left 3 places.