Answer:
A
Explanation:
More potential energy equals more kinetic
I believe the density will decrease, because if you look at the equation d=m/v. This can also be written as d=m(1/v). So if you increase volume, let's say you increase from 10ml to 1000ml. And keeping mass same, say 5 grams,then instead of having 1/10= 0.1ml then putting the equation together as 5x0.1. You will have for the second equation 5x(1/1000ml)= 5x0.001. You can see for yourself after multiplying these 2 values from the different equation which density value is smaller and larger.
I think it should be option (b)
The tip of the fan moves through the outer side of the circle.
So it moves a distance of perimeter of circle in one revolution.
Perimeter of circle = 2r, where r is the radius of circle.
In this case radius of circular motion = 0.19 meter
So perimeter of circle = 2*0.19 = 0.38 = 1.194 m
So distance does the tip move in one revolution = 1.194 meter
1) The electrostatic force between the two pieces of paper is
2)
- If the charges of the two pieces of paper are both + or both -, they repel each other
- If the charges of one piece of paper is positive and the other one is negative, they attract each other
Explanation:
1)
The electrostatic force between two charged objects is given by Coulomb's law:
where:
is the Coulomb's constant
are the two charges
r is the separation between the two charges
In this problem, we have the following situation:
is the charge on the first piece of paper
is the charge on the second piece of paper
is their separation
Substituting into the equation, we find the magnitude of the electrostatic force between them:
2)
The electrostatic force can be either attractive of repulsive, depending on the relative sign of the charges of the objects involved.
In particular, we have:
- If the two charges have same sign (both positive or both negative), the force between them is repulsive
- If the two charges have opposite sign (one positive and one negative), the force between them is attractive
Therefore, in this case:
- If the charges of the two pieces of paper are both + or both -, they repel each other
- If the charges of one piece of paper is positive and the other one is negative, they attract each other
Learn more about electric force:
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