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3 years ago

A ball is thrown straight up into the air with a speed of 13 m/s. If the ball has

Chemistry

1 answer:

nataly862011 [7]3 years ago

5 0

Answer:

The total energy, i.e. sum of kinetic and potential energy, is constant.

i.e. E = KE + PE

Initially, PE = 0 and KE = 1/2 mv^2

At maximum height, velocity=0, thus, KE = 0 and PE = mgh

Since, total energy is constant (KE converts to PE when the ball is rising),

therefore, KE = PE

or, 1/2 mv^2 = mgh

or, h = v^2 /2g = 13^2 / (2x9.8) = 8.622 m

Hope this helps.

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If a chemical reaction such as photosynthesis begins with 6 atoms of carbon C , how many atoms of carbon C should be in the prod

pochemuha

B. 6 atoms of carbon C
I would think this is the answer, because one can't just delete or add atoms; otherwise, the equation would be unbalanced. This also abides with the Law of Conservation of Mass.

Plus, I also came to that conclusion because if we look at the net equation of photosynthesis:
$6C O_{2} + 6H_{2}O$ ––> $C_{6}H_{12}O_{6} + 6O_{2}$
The number of Carbon atoms is 6 on both the reagent's side and the product's side.

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3 years ago

Read 2 more answers

Charcoal from the dwelling level of the Lascaux Cave in France gives an average count of 0.97 disintegrations of ^14 C per minut

Verdich [7]

Answer:

Explanation:

count given by old sample = .97 disintegrations per minute per gram

count given by fresh sample = 6.68 disintegrations per minute per gram

Half life of radioactive carbon = 5568 years

rate of disintegration

dN / dt = λ N

In other words rate of disintegration is proportional to no of radioactive atoms present . As number reduces rate also reduces .

Let initial no of radioactive be N₀ and after time t , number reduces to N

N₀ / N = 6.68 / .97

Now

$N=N_0e^{-\lambda t}$

$\frac{N}{N_0} =e^{-\lambda t}$

$\frac{6.68}{.97} = e^{\lambda t}$

λ is disintegration constant

λ = .693 / half life

= .693 / 5568

= .00012446 year⁻¹

Putting the values in the equation above

$\frac{6.68}{.97} = e^{.00012446\times t}$

$6.8866 = e^{.00012446\times t}$

1.929577 = .00012446 t

t = 15503.6 years .

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3 years ago

Extend your thinking: Why do you think the temperature does not change much during a phase change? If possible, discuss your ans

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Answer:

The rate of temperature change does not stay constant and decreases over time because the temperature difference decreases over time.

Explanation:

The temperature difference is due to Thermal Equilibrium

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Which group of elements readily loses two electrons to form a compound?

nexus9112 [7]

The alkaline earth metals (the second group) because their ion charge is +2

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4 years ago

An ionic compound is a chemical compound dissociated into positive and negative ions, but globally neutral (it is a bond that us

Firdavs [7]

True

Explanation:

Ionic compounds are chemical compounds that dissociates into positive and negative ions and are globally neutral due to the charge balance. They are made up of metals and non-metals.

Ionic bonds are formed between two kinds of atoms having a large electronegativity difference.
It is usually between metals and non-metals.
The formation of this bond type involves the transfer of electrons from the less electronegative atom such that the two kinds of atoms now have completely filled outer shell like the noble gases.
This transfer makes the metal positively charged while the non-metal becomes negatively charged.
The atoms forms ions that are oppositely charged.
The charges are balanced out leaving a net neutral compound.
The electrostatic force of attraction between these ions is the ionic or electrovalent bond.

learn more:

Ionic compound brainly.com/question/6071838

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3 years ago