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ruslelena [56]
3 years ago
13

Which of the following is a conductor for electricity?

Physics
2 answers:
oksian1 [2.3K]3 years ago
5 0
Water conducts electricity
Aleks [24]3 years ago
3 0
The answer is water!

Water is a wonderful conductor of electricity; while wood and wool are not very good and rubber doesn't allow any currents through it.
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A 4.30 g bullet moving at 943 m/s strikes a 730 g wooden block at rest on a frictionless surface. The bullet emerges, traveling
Ymorist [56]

Answer:

(a)2.7 m/s

(b) 5.52 m/s

Explanation:

The total of the system would be conserved as no external force is acting on it.

Initial momentum = final momentum

⇒(4.30 g × 943 m/s) + (730 g × 0) = (4.30 g × 484 m/s) + (730 g × v)

⇒ 730 ×v = (4054.9 - 2081.2) =1973.7

⇒v=2.7 m/s

Thus, the resulting speed of the block is 2.7 m/s.

(b) since, the momentum is conserved, the speed of the bullet-block center of mass would be constant.

V_{COM} = \frac{m_b}{m_b+m_{bl}}v_{bi}=\frac{4.30}{4.30+730}\times 943 m/s = 5.52 m/s

Thus, the speed of the bullet-block center of mass is 5.52 m/s.

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3 years ago
I need to know which ones are physical or chemical changes.
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I believe this is right but double check to make sure :)
7 0
3 years ago
A solar eclipse that occurs when the new moon is too far from earth to completely cover the sun can be either a partial solar ec
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2) </span><span>anyone looking from the night side of earth can, in principle, see a -->
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3) </span><span>during some lunar eclipses, the moon's appearance changes only slightly, because it passes only through the part of earth's shadow called the -->
Answer: PENUMBRA. 

4) </span><span>a ... can occur only when the moon is new and has an angular size larger than the sun in the sky -->
Answer: TOTAL SOLAR ECLIPSE. When the moon is new, it means it is between the sun and the Earth, and its dark side faces the Earth. If the moon's angular size is also larger than the sun angular size, than it will completely cover the sun, and a total solar eclipse occurs.

5) </span><span>a partial lunar eclipse begins when the moon first touches earth's --> 
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6) </span><span> a point at which the moon crosses earth's orbital plane is called a(n)  --> 
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5 0
3 years ago
Why do elements within a group have similar chemical properties
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Elements<span> in the same </span>group<span> in the periodic table </span>have similar chemical properties<span>. This is because their atoms </span>have<span> the same number of electrons in the highest occupied energy level. </span>Group<span> 1 </span>elements<span> are reactive metals called the alkali metals.</span>Group<span> 0 </span>elements<span> are unreactive non-metals called the noble gases.
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4 0
3 years ago
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