1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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!
You might be interested in
How Many protons is there
grigory [225]
Protons in science is positive
4 0
3 years ago
The element copper has 29 protons. What is the atomic number of copper?
stiks02 [169]
The atomic number of copper is 29.

Hope this helps and if it does, don't be afraid to rate my answer as well as maybe give it a "Thanks"? (Or even better a "Brainliest"). And if it’s not correct, I am sorry for wasting your time, and good luck finding the correct answer :)


8 0
2 years ago
Read 2 more answers
A 25.0 mL sample of 0.100 M lactic acid (HC3H503, Ka = 1.4 E-4) is titrated with 0.100 M NaOH solution. Calculate the pH of the
aleksklad [387]
I’m a bit confused too
4 0
3 years ago
The equilibrium constant, Kc, for the following reaction is 3.61×10-4 at 426 K. PCl5(g) PCl3(g) + Cl2(g) When a sufficiently lar
iogann1982 [59]

Answer:

the concentration of PCl5 in the equilibrium mixture = 296.20M

Explanation:

The concept of equilibrium constant was applied where the equilibrium constant is the ration of the concentration of the product over the concentration of the reactants raised to the power of their coefficients. it can be in terms of concentration in M or in terms of Pressure in atm.

The detaied steps is as shown in the attached file.

8 0
3 years ago
1.Explain why the reactivity of group 7 decreases as you move down the group. Try to use the sentence starters here: When group
Kruka [31]

Answer: The reactivity of group 7 decreases as we move down the group because:

Explanation:

The elements of group 7 that is fluorine to iodine. The halogens are non metals and they react with metals to gain electrons. The metals loose electrons and the non metal gains it.

As we move down the group  the atomic radius gets bigger( more electron and more proton) and as a result the outer shells move further away from the nucleus.

There is more distance between the negatively charged electrons and positively charged nucleus.

Therefore the force of attraction between the shells and nucleus is lesser or weaker.

This makes attracting an extra electron from metals very difficult which results in weaker reaction.

Consequently, the reactivity decreases as we move down the group 7

5 0
3 years ago
Other questions:
  • ________________ in the atmosphere and ocean creates wind and ocean currents.
    15·2 answers
  • what is the position of an element in the periodic table if its electrons configuration is 1s2 2s2 2p6 3s2 3p5?
    10·1 answer
  • Elements in the same period of the periodic table exhibit similar physical and chemical properties.
    6·1 answer
  • Bread dough rising<br> gas formation<br> color change<br> light emission
    13·2 answers
  • Which food type will show no colour charge when it is tested with millon's reagent /Bluret solution​
    7·1 answer
  • 2. Does sexual or asexual reproduction produces MORE diversity in offspring?​
    8·1 answer
  • Three chemical reactions of ethane?
    9·1 answer
  • A catalyst increases the rate of a chemical reaction by
    5·1 answer
  • During a chemical reaction, heat is absorbed. What kind of reaction occurred?
    10·2 answers
  • Convert 0.809 mol AlCl3 to formula units AlCl3.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!