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Vikki [24]
3 years ago
15

A person struggles very hard to lift a large boulder. He puts in so much effort, he starts to sweat, his heart rate increases, a

nd he gets really tired. All of his effort is for nothing, the boulder does not move at all. In this situation, has work been done? Explain!
*Use the scientific definition of "work" to answer this question.
Chemistry
1 answer:
Tems11 [23]3 years ago
6 0
No, according to physics no work has been done.

Work must have been done by muscular force but in terms of physics no work has been done.

In physics,work is said to be done only if the force applied produced some kind of displacement in the direction of force.

In this example provided, no work has been done since the boulder doesn't get displaced,it continues to remain at its original position.

Hope This Helps You!
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What is the pressure of 2.50 moles of an ideal gas if it has a volume of 50.0 liters when the temperature is 300.0 K
Ierofanga [76]
Start with the ideal gas equation, <span><span><span>PV=nRT</span> </span><span>PV=nRT</span></span> and rearrange for pressure to get <span><span><span>p=<span><span>nRT</span>V </span></span> </span><span>p=<span><span>nRT</span>V</span></span></span> . You have all the necessary variables in their proper units, so plug em' into the equation to solve for pressure in units of atmospheres.

<span><span><span>P=<span><span>(2.5 mol)(300 K)(0.08206 L atm <span><span>K </span><span><span>−1</span> </span></span> mo<span><span>l </span><span><span>−1</span> </span></span></span><span>50.0 L</span> </span>=1.23 atm</span> </span><span>P=<span><span>(2.5 mol)(300 K)(0.08206 L atm <span>K<span>−1</span></span> mo<span>l<span>−1</span></span></span><span>50.0 L</span></span>=1.23 atm</span></span>

All that needs to be done now is converting atmospheres to mm <span><span><span>Hg</span> </span><span>Hg</span></span> .

<span><span><span>1.23 atm∗<span><span>760 mm Hg</span><span>1 atm</span> </span>=935 mm Hg</span> </span><span>1.23 atm∗<span><span>760 mm Hg</span><span>1 atm</span></span>=935 mm Hg</span></span> .

That value makes sense, since the original pressure in atmospheres was above 1, the pressure in mm <span><span><span>Hg</span> </span><span>Hg</span></span> will be above 760.
7 0
3 years ago
A gas occupies a volume of 131.0-mL at 165.2-kPa. What volume will the gas occupy at 170.8-kPa if the temperature remains the sa
Ulleksa [173]

The relationship between the pressure and the volume of the gas at a constant temperature is given by Boyle's law. The volume, of the gas at  170.8 kPa is 126.70 mL.

<h3>What is Boyle's law?</h3>

Boyle's law states the inverse relationship between the pressure and the volume of the gas. The formula for the law can be given by:

\rm P_{1}V_{1} = P_{2}V_{2}

Given,

Initial pressure = 165.2 kPa

Initial volume = 131.0 mL

Final pressure = 170.8 kPa

The final volume is calculated as:

165.2 * 131.0 = 170.8 * V

V = 126.70 mL

Therefore, the final volume of the gas is 126.70 mL.

Learn more about Boyle's law here:

brainly.com/question/16607771

#SPJ1

6 0
2 years ago
How many hydrogen atoms are found in 3H2CO3?
Fiesta28 [93]

Answer:

6

Explanation:

The number of hydrogen atoms in the given compound is 6 atoms.

  Given compound is:

              3H₂CO₃

An atom is the smallest indivisible particles of an element.

  In the compound;

             3H₂CO₃

          Elements          Number of atoms

               H                       3(2)  = 6

               C                       3(1)   = 3

               O                       3(3)    = 9

The number of hydrogen atoms in the compound is 6

5 0
2 years ago
Cole is working with radioactive particles and has set up a shield made of aluminum for protection. Which of the following will
koban [17]

Answer:

C.) Alpha, beta, and gamma particles

Explanation:

A dense shield of aluminium can protect Cole from all the listed types of radiation produced from the radioactive particles.

A radioactive protector has very unique and specie ability to contain and prevent the movement of radiations of any types from going into the body.

The strongest and most penetrating radiations are the gamma rays. Any material that can prevent the movement of these rays can halt alpha and beta particles too.

An aluminium shield is made up of multiple layers of aluminium stacked together and it provides enough resistance.

6 0
3 years ago
Read 2 more answers
Prompt 2 - You are watching the Indy 500 car race on television with your brother. He says, "Did you know that
Alekssandra [29.7K]

Answer:

500

Explanation:

from the average and if yoy multiple and then add your % and x you would get 500 to 600

8 0
2 years ago
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