If an electrically charged plastic bag is placed close to an uncharged cloth, what will happen? The charge of the bag will change.
The charge of the cloth will change.
The plastic bag will attract the cloth.
The plastic bag will repel the cloth.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.

the answer to this question is 3.