2.92 x 10^-15/<br> (5.6 x 10^-3) (4.16 x 10^9)

A 45 kg box is sitting on a window ledge 2.0 m above the ground. What is the potential energy of the box?

Travka [436]

Answer:

<h3>The answer is 900 J</h3>

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 45 × 10 × 2

We have the final answer as

Hope this helps you

5 0

3 years ago

Call each of your flowers as water employee increase rate of growth

IceJOKER [234]

Okay ...................x

4 0

3 years ago

Use the reaction equation and bond energies to answer the question.

Arisa [49]

This problem is providing us with the chemical equation for the decomposition of water to hydrogen and oxygen, the involved bond energies and asks for the total energy of the reaction as well as whether it is endothermic or exothermic. At the end, one comes to the conclusion that it is exothermic because the total energy is -425 kJ.

<h3>Bond energy:</h3>

In chemistry, bond energies are defined as the necessary energy to break a bond between two atoms. In this case, we see that water, H2O has two H-O bonds and hydrogen and oxygen have two H-H and one O=O bonds, respectively.

Thus, we write the following heat equation, which comprises the aforementioned bond energies and the stoichiometric coefficients in the reaction:

$\Delta H=2*\Delta H_{H-O}-(2*\Delta H_{H-H}+\Delta H_{O=O})$

Hence, we plug in the given bond energies to obtain:

$\Delta H=2*467kJ/mol-(2*432kJ/mol+495kJ/mol)\\
\\
\Delta H =-425kJ/mol$

Where the negative suggests this is an exothermic reaction as it releases energy (negative enthalpy).

Learn more about bond energies: brainly.com/question/26141360

5 0

3 years ago

In which of the following case would the rusting of iron nail be the slowest ? thanks !

coldgirl [10]

Answer: D or B but i think D because iron will react slower with tap water than Hydrochloric acid

4 0

3 years ago

The maximum number of electrons that are possible at a given energy level depends on the number of ____ at the energy level.

VMariaS [17]

Answer:

<u><em> orbitals </em></u>

Explanation:

Each orbital may contain a maximum of two electrons.

The energy level is the principal quantum number: 1, 2, 3, 4, 5, 6, 7.

The principal quantum number limits the kind of orbital (ℓ ) and the number of orbitals (mℓ ).

I. Principal quantum number, n = 1

Angular or orbital quantum number : ℓ = 0 ⇒ ortibal s

Magnetic quantum number: mℓ = 0

⇒ number of orbitals 1 ⇒ number of electrons: 2

II. Principal quantun number, n = 2

Angular or orbital quantum number : ℓ = 0 and 1 ⇒ ortibal s and p

Magnetic quantum number:

for ℓ: mℓ = 0: 1 s ortibal

for ℓ = 1: mℓ = -1, 0, and +1: 3 p ortitals

⇒ number of orbitals 4 ⇒ number of electrons: 8

III. Principal quantun number, n = 3

Angular or orbital quantum number : ℓ = 0, 1, and 2 ⇒ ortibal s, p and d

Magnetic quantum number:

for ℓ: mℓ = 0: 1 s ortibal

for ℓ = 1: mℓ = -1, 0, and +1: 3 p ortitals

for ℓ = 2: mℓ = -2, -1, 0, +1, and +2: 5 d ortitals

⇒ number of orbitals 9 ⇒ number of electrons: 18

IV. Principal quantun number, n = 4

Angular or orbital quantum number : ℓ = 0, 1, 2, and 3 ⇒ ortibal s, p, d and f

Magnetic quantum number:

for ℓ: mℓ = 0: 1 s ortibal

for ℓ = 1: mℓ = -1, 0, and +1: 3 p ortitals

for ℓ = 2: mℓ = -2, -1, 0, +1, and +2: 5 d ortitals

for ℓ = 3: mℓ = ±3, ±2, ±1, and 0: 7 f ortitals

⇒ number of orbitals 16 ⇒ number of electrons: 32.

Thus, you have:

energy level, n maximum number of maximum number of

orbitals electrons

1 1 2

2 4 8

3 9 18

4 16 32

Those numbers follow a rule: n² and 2n². You can verify that the previous numbers are in accordance with those formulas.

3 0

3 years ago

2.92 x 10^-15/ (5.6 x 10^-3) (4.16 x 10^9)