Can a physical change,change what a substance is? Explain your answer by giving an example.

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Answer 1
Answer: no; a physical change of paper could be crumpling it up. it is still paper even if you crumple it, but youve changed its form. 

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An actress wears a blue dress. How could you use spot lights to make the dress appear to be black?

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Answer:

Use a yellow (Red + Green) spotlight to make it look black.

Explanation:

The blue fabric has pigments that can absorb the red and green light. This light is incident on the fabric, therefore, there is no light left to be reflected back, so, at plain sight, the dress will look black.

Explain why a magnet from your refrigerator could not be used to life something as heavy as a car ?

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Answer:

Explanation:

because it wouldnt connect

Can someone please describe surface tension to me. Please don't give me the dictionary definition. Thank you

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Surface tension - My definition -

It's exactly what it says - The tension of a surface with a liquid (such as water), caused by the attraction of the surfaces layer ---- I hope this helps ---- I actually did research it and got some of this from a dictionary, but I changed some of it, too.... Sorry if this doesn't help :)

Since the moon has less mass then the earth what happens to objects on the moon A.They fall slower
B.they fall faster
C.they don’t fall
D.They fall at the same rate as they do on earth

Answers

A) They move slower


Gravity force is determined by mass and the size of the moon. Since the mass of the moon is significantly lower than the mass of Earth, it will pull objects slower. The only object that would fall faster on the moon than on earth is a sheet of paper since there is much, much less air resistance to affect its terminal velocity the way it does on the earth.

What is meant by gravitational field strength at a point in the gravitational field​

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Answer:

Explanation:

The gravitational field strength at a point is the gravitational force exerted per unit mass placed at that point. This means that the gravitational field strength, g {\displaystyle g} is equal to the force experienced by a mass of 1 kg in that gravitational field.

1.) Properties of a compound are_____the properties of the elements that make them up.2.)Compounds form as a result of a______

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1). ... sometimes but not necessarily similar to ...

2). ... chemical reaction.