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True [87]
3 years ago
7

What is meant by a 'closed system'?

Physics
2 answers:
VladimirAG [237]3 years ago
8 0

Answer:

A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy is or is not allowed

Explanation:

vovangra [49]3 years ago
7 0

Answer:

Image result for What is meant by a 'closed system'?

A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy

Explanation:

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Which explanation describes the forces involved for a person to walk down the sidewalk?
Svet_ta [14]

The person walking down the sidewalk follows the newton's third law of motion.

Explanation:

  • A person is able to walk down the sidewalk by using the reaction forces from the ground.
  • In simple term, feet pushes the ground and the reaction forces makes the feet able to walk.
  • Another important force included in the walking mechanism is friction. With out friction one cannot walk down the sidewalks.
  • Hence the forces involved in the walking of a person down the sidewalk are:
  1. Friction force
  2. Action and reaction force between ground and person's feet.
4 0
3 years ago
The weight of a girl with the mass of 40.0kg is ?
Allushta [10]

Answer:

392 Newtons

Explanation:

In order to find the weight, you have to multiply the mass by the gravitation constant (9.8), which gives us 40.0 * 9.8 = 392 Newtons.

4 0
3 years ago
How can you make the work output of a machine greater than the work input?
Vsevolod [243]

Answer: D) none of the above

Explanation: This is a classic problem of thermodynamics, and refers to the principle of conservation of energy to give a correct answer

Option A) can be ruled out since no matter how much friction is reduced, it will always exist and therefore some energy will be lost

option B) and C) are out of context since the loss of work or energy will continue to exist even if those values ​​are modified, so they do not answer the question

D) is the correct one since it should be said that this is not possible (so far...) as it goes against the conservation of energy and this option is none of the above

7 0
2 years ago
Fill in the blank.<br> _______________, not velocity, is used to calculate the average acceleration.
Ainat [17]

Explanation:

Calculating acceleration is complicated if both speed and direction are changing or if you want to know acceleration at any given instant in time. However, it’s relatively easy to calculate average acceleration over a period of time when only speed is changing. Then acceleration is the change in velocity (represented by Δv) divided by the change in time (represented by Δt):

acceleration=ΔvΔt

8 0
3 years ago
Read 2 more answers
To study waves that humans can see which section of the electromagnetic spectrum would you use
andrey2020 [161]
Visible light is the spectrum that humans can see ranging from 400-700 nm
4 0
3 years ago
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