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Alex Ar [27]
3 years ago
8

Why do different substances have different melting and boiling points?

Physics
1 answer:
azamat3 years ago
3 0
Because the atoms and molecules all have different properties
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Coulomb’s Law relates which of the following?
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The answer is "The force between two charges and the distance separating them".

Coulomb's Law is written as:

F=k \frac{q_1q_2}{r^2}

In which F is the force felt between two charges, q_1 is the charge of one particle, q_2 is the charge of the other particle, r is the distance separating them, and k is a constant.
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What problems do you think might arise if the chromosomes did not align during metaphase?
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While at the county fair, you decide to ride the Ferris wheel. Having eaten too many candy apples and elephant ears, you find th
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Answer:

v=3.47m/s

Explanation:

The speed is by definition the distance traveled divided over the time it takes to travel that distance. In this case, this distance is the circumference of the wheel, so we have:

v=\frac{C}{t}=\frac{2\pi r}{t}

where we have written the circumference in terms of its radius.

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v=\frac{2\pi r}{t}=\frac{2\pi (16m)}{(29s)}=3.47m/s

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3 years ago
A soccer ball is kicked from the ground with an initial speed v at an upward angle θ. A player a distance d away in the directio
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Answer:

U = √Rg/sin2θ

Explanation:

Using the formula for "range" in projectile motion to derive the average speed before the ball hits the ground.

Range is the distance covered by the body in the horizontal direction from the point of launch to the point of landing.

According to the range formula,

R = U²sin2θ/g

Cross multiplying we have;

Rg = U²sin2θ

Dividing both sides by sin2θ, we have;

U² = Rg/sin2θ

Taking the square root of both sides we have;

√U² = √Rg/sin2θ

U = √Rg/sin2θ

Therefore, his average speed if he is to meet the ball just before it hits the ground is √Rg/sin2θ

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