Why do stars twinkle

1 answer:

4 0

As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star's appearance to wobble or twinkle.

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1. Flammability is a material's ability to burn in the presence of...

goldfiish [28.3K]

For number 2 the answer is a change in color.

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The electric potential at a certain distance from a point charge can be represented by V. What is the value of the electric pote

Maksim231197 [3]

Answer:

b. At twice the distance, the electric potential is V/2

Explanation:

Electric potential

Is the amount of work needed to move a unit charge from a reference point (usually a point at infinity) without producing acceleration.

The electric potential due to a point charge q at a distance r is given by

$\displaystyle V=K\frac{q}{r}$

Where K is the Coulomb's constant. If we know the electric potential at a certain distance is V, if the distance is changed to 2r, then the new potential is

$\displaystyle V'=K\frac{q}{2r}=\frac{1}{2}K\frac{q}{r}=\frac{1}{2}V$

It means that the electric potential is half the previous value. Correct option: b.

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Explqin how energy is different from work

Masja [62]

Energy has forms while work is done on an object when force is applied and the object covers distance

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Beyond the petition Neptune a field of smaller bodies orbits the Sun.Some scientists think these objects are the remains of mate

Vladimir79 [104]

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On average, both arms and hands together account for 13% of a person's mass, while the head is 7.0% and the trunk and legs accou

BabaBlast [244]

Answer:

176.38 rpm

Explanation:

mass percentage of arms and legs = 13%

mass percentage of legs and trunk = 80%

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height of skater = 1.8 m

diameter of trunk = 35 cm = 0.35 m

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We assume:

The spinning skater with her arms outstretched as a vertical cylinder (head, trunk, and legs) with two solid uniform rods (arms and hands) extended horizontally.
friction between the skater and the ice is negligible.

We split her body into two systems, the spinning hands as spinning rods

1. Each rod has moment of inertia = $\frac{1}{3} mL^{2}$