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3 years ago

!! 50 points spent, easy points for you. 8th-grade science/physics !!

Physics

1 answer:

luda_lava [24]3 years ago

7 0

Answer:

1.mirage

2.lens

3.concave lens

4.convex lens

5.index of refraction

Explanation:

IQ=999999

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A 0.48 kg pool cue moving at 3.39 m/s hits the 0.22 kg cue ball that was a rest and the pool cue stops after the impact. What is

Grace [21]

Answer:

7.39 m/s is the velocity of the cue ball after impact.

Explanation:

Given that,

$\text { Mass of the pool cue is } 0.48 \mathrm{kg} .\left(\mathrm{m}_{\mathrm{i}}\right)$

$\text { Moving at velocity } 3.39 \mathrm{m} / \mathrm{s} .(\mathrm{v_i})$

$\text { Mass of the cue ball that } 0.48 \text { mass ball hits is } 0.22 \mathrm{kg} .\left(\mathrm{m}_{\mathrm{f}}\right)$

$\text { We need to find the velocity ( } \mathrm{v}_{\mathrm{f}} \text { ) of the cue ball of mass } 0.22 \mathrm{kg} \text { . }$

We know that,

If two objects collide then the “total momentum” before is equal to the “total momentum” after collision.

$\mathrm{m}_{\mathrm{i}} \mathrm{v}_{\mathrm{i}}=\mathrm{m}_{\mathrm{f}} \mathrm{V}_{\mathrm{f}}$

Substitute the given values in the formula.

$0.48 \times 3.39=0.22 \times \mathrm{V}_{\mathrm{f}}$

$\frac{1.6272}{0.22}=\mathrm{V}_{\mathrm{f}}$

$\mathrm{v}_{\mathrm{f}}=7.39 \mathrm{m} / \mathrm{s}$

3 0

4 years ago

CCL4 is Non polar and NH3 is Polar? Why?

lys-0071 [83]

Answer:

CCL4 is non polar cause' they are equal covalent bonds between carbon and chlorine.
The electronegativity difference between hydrogen and nitrogen is about .9 which is a pretty polar bond. So each N-H bond is definitely polar. But NH3 is also asymmetrical .

6 0

3 years ago

What are two ways you can change atomic mass

e-lub [12.9K]

Atomic mass can change through the process of fusion. Another way is, it can also change in nuclear fusion.

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4 years ago

Mount Tambora, in Indonesia, erupted in April 1815, spewing huge amounts of fine ash into the air. The ash quickly spread throug

fredd [130]

Crops need sunlight to grow as well as water.

Reduced sunlight means reduced growth rate of crops means reduced crop yield means reduced number of mouths each yield can feed means famine means death.

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4 years ago

Why is everything spinning? Moons, planets and stars all rotate on their axes, moons orbit planets, planets orbit stars, spiral

kow [346]

Answer:

Conservation of angular momentum

Explanation:

When the objects spread in universe after big bang, because of the tremendous force , they gained angular momentum and started to rotate. Since, then the object continue to rotate on their axis because of conservation of angular momentum. In vacuum of space there no other forces that can stop these rotation, therefore, they continue to rotate.

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3 years ago