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3 years ago

Which is the best example of potential energy

Chemistry

2 answers:

kvasek [131]3 years ago

6 0

A. holding a basketball in the air.

Goshia [24]3 years ago

5 0

Answer: Option (A) is the correct answer.

Explanation:

Potential energy is defined as the energy obtained by an object due to its position or height.

Mathematically, P.E. = mgh

where m = mass of object

g = force of gravity

h = height of the object

Hence, we can conclude that out of the given options the best example of potential energy holding a basketball in the air.

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Vanessa jogged 8 miles in 2 hours. What was her average speed?

rodikova [14]

8miles in 2 hours. Let's find how many she did on average in one hour.

8/2 = 4miles per hour.

4 0

3 years ago

Read 2 more answers

The rate constant for a certain reaction is measured at two different temperatures:

Talja [164]

Answer: The activation energy Ea for this reaction is 22689.8 J/mol

Explanation:

According to Arrhenius equation with change in temperature, the formula is as follows.

$ln \frac{k_{2}}{k_{1}} = \frac{-E_{a}}{R}[\frac{1}{T_{2}} - \frac{1}{T_{1}}]$

$k_1$ = rate constant at temperature $T_1$ = $2.3\times 10^8$

$k_2$ = rate constant at temperature $T_2$ = $4.8\times 10^8$

$E_a$ = activation energy = ?

R= gas constant = 8.314 J/kmol

$T_1$ = temperature = $280.0^0C=(273+280)=553K$

$T_2$ = temperature = $376.0^0C=(273+376)=649K$

Putting in the values ::

$ln \frac{4.8\times 10^8}{2.3\times 10^8} = \frac{-E_{a}}{8.314}[\frac{1}{649} - \frac{1}{553}]$

$E_a=22689.8J/mol$

The activation energy Ea for this reaction is 22689.8 J/mol

3 0

3 years ago

Determine the mass of MgCl2 needed to create a 100. ml solution with a concentration of 3.00 M.

kiruha [24]

Explanation:

$1000ml \: contain \: 3 \: moles \\ 100 \: ml \: will \: contain \: ( \frac{100 \times 3}{1000} ) \: moles \\ = 0.3 \: moles \\ RFM = 95 \\ 1 \: mole \: weighs \: 95 \: g \\ 0.3 \: moles \: weigh \: ( \frac{(0.3 \times 95)}{1} \: g \\ = 28.5 \: g \: of \: magnesium \: chloride$

5 0

3 years ago

Locations Cost of land Cost of equipment Cost of mining and reclamation Time taken to mine the area 1 $100,000 $10,000 $5,000 pe

mario62 [17]

Answer:

Location 2 will cost the least to the company to mine.

Explanation:

a) Data and Calculations:

Locations Cost of land Cost of Cost of mining Time taken to

equipment and reclamation mine the area

1 $100,000 $10,000 $5,000 per day 30 days

2 $35,000 $6,000 $4,500 per day 45 days

3 $30,000 $7,500 $3,500 per day 120 days

4 $40,500 $8,000 $7,000 per day 65 days

Locations Cost of land Cost of Cost of mining Total

equipment and reclamation Costs

1 $100,000 $10,000 $150,000 ($5,000 * 30) $260,000

2 $35,000 $6,000 $202,500 ($4,500 * 45) $243,500

3 $30,000 $7,500 $420,000 ($3,500 * 120) $457,500

4 $40,500 $8,000 $445,000 ($7,000 * 65) $503,500

7 0

3 years ago

An element that has 2 core electrons and 3 valence electrons

gavmur [86]

Answer:

Boron

Explanation:

You can find this by looking at the number of protons in Boron, 5.

Then calculate how many electrons you are given, in this case the 2 core plus the 3 valence equal 5 total electrons

Neutral elements have the same number of protons and electrons, so your answer would be the element with 5 electrons, Boron.

You can also know this by using electron configuration. Since you kow there are 5 electrons then you can use EC to find out where your element is. In this case it is: 1s2 2s2 2p1

6 0

3 years ago