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Nadusha1986 [10]
3 years ago
7

Which of the following is a sign of a physical Change ?

Physics
2 answers:
guapka [62]3 years ago
7 0

C.) i believe because the change in shape is changing the physical appearance

galina1969 [7]3 years ago
5 0

<u>Answer:</u>

The correct answer option is C) A change in the shape of a substance.

<u>Explanation:</u>

Physical changes can be defined as the changes which affect the form of a chemical substance but not its chemical composition. These are the changes in which no bonds are broken or formed.

A change in the shape of a substance is a physical change because there is no change in composition of the substance chemically.

While all other options involve a change in chemical composition so they are not the examples of a physical change.

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The centripetal force that keeps an object moving in a circle is

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We want to know the radius, to rearrange the formula to give us
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Multiply each side by 'r':       F· r  =  m · s²

Divide each side by 'F':            r  =  m · s² / F    

We know all the numbers on the right side,
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                      r  =       m       ·        s²      /     F

                      r  =  (1200 kg) · (20 m/s)² / (6000 N) .

I'm pretty sure you can finish it up from here.

                                      


5 0
3 years ago
the electrostatic force between two objects is 40N. if the charge of one object is cut in half, and the distance is doubled, wha
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The answer you are looking for is: 
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3 years ago
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A uniform rod of length L is pivoted at L/4 from one end. It is pulled to one side through a very small angle and allowed to osc
ludmilkaskok [199]

Answer:

T= 4.24sec

Explanation:

We are going to use the formula below to calculate.

T=2\pi \sqrt{\frac{L}{g} }

Where T is period

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From the problem, the rod is pivoted at 1/4L which means that three quarter of the rod was used for the oscillation. lets call this L_{O}

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8 0
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