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BigorU [14]
4 years ago
11

Which of the following is a physical change?

Physics
1 answer:
Talja [164]4 years ago
5 0
I believe c is correct......
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As a simple pendulum of length ℓ sweeps back and forth in the arc of a circle, there are two forces acting on it: gravity m g an
Y_Kistochka [10]

Answer:

Gravity

Explanation:

Lets take the mass of the pendulum = m

Angle from vertical axis = θ

From the diagram

The gravity force mg have two component ,First one mg cosθ and other one is mg sinθ.

The component of gravity force  mg sinθ is responsible for the motion of the pendulum ,that is why gravity does work in the pendulum.

Therefore the answer is  -

Gravity

8 0
3 years ago
Doug is doing work. Without knowing exactly what he is doing, which can be said about the work he is doing?
WARRIOR [948]
<h3>Answer;</h3>

<em>Energy is transferred.</em>

<h3>Explanation;</h3>
  • Work is the force applied over a given distance, in other words work is the product of force and distance. That is; Work = force × distance.
  • Work is measured in Joules.
  • Energy on the other hand, is the ability to do work.
  • According to the principle of work-energy a change in the kinetic energy is equivalent to the net work don e by the object. Therefore, when work is being done energy is being transferred from one point to another.


8 0
4 years ago
Read 2 more answers
Two identical massless springs of constant k = 200N/m are fixed at opposite ends of a level track, as shown. A 5 kg block is pre
Rina8888 [55]
Energy in spring: 
<span>E = ½k · x²; where x = 0.15m </span>

<span>From coefficient of friction, </span>
<span>F = µ · N = µ · mg; where m = 5kg and g = 9.807m/s² </span>

<span>Work done each pass = </span>
<span>W = ∫Fdx = Force · distance </span>

<span>Just divide E by W to see how many passes, use this to figure out where it stops. </span>
5 0
3 years ago
Si units are the modern form of the<br> Reset<br> Next
Zanzabum

Answer:

Reset

Explanation:

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system and is the most widely used system of measurement.

7 0
4 years ago
A boy is running with a kinetic energy of 810 J. If the boy has a mass of 80 kg, what is his speed?
enot [183]
My answer would be 4.5 m/s squared. 

Hope this helps!
8 0
4 years ago
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