3 years ago

Which statement is true?

Physics

1 answer:

miv72 [106K]3 years ago

8 0

B might be the correct answer

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PLEASE HURRY AND HELP ME

laila [671]

Answer:

I believe the answer would be C. point z

5 0

4 years ago

3. A concrete highway is built of slabs 12 m long (20o C). How wide should the expansion cracks between the slabs be (at 20o C)

lesantik [10]

Answer:

$\Delta x=2.304\times 10^{-2}\ m=2.304\ cm$ is the minimum gap between the slabs

Explanation:

Given:

length of the concrete highway, $l=12\ m$

coefficient of thermal expansion, $\alpha=12\times 10^{-6}\ ^{\circ}C^{-1}$

range of temperature variation, $(-30^{\circ}C\ to\ 50^{\circ}C) \Rightarrow \Delta T=80^{\circ}C$

<u>Now form the equation of thermal expansion:</u>

$\Delta l=l\times \alpha\times \Delta T$

$\Delta l=12\times (12\times 10^{-6})\times 80$

$\Delta l=1.152\times 10^{-2}\ m$

Since each slab of the highway expands by the above length so the minimum gap between the slabs to prevent buckling:

$\Delta x=2\times \Delta l$

$\Delta x=2\times( 1.152\times 10^{-2})$

$\Delta x=2.304\times 10^{-2}\ m=2.304\ cm$ is the minimum gap between the slabs

4 0

3 years ago

Which type of energy is released when a nucleus is split apart

gayaneshka [121]

Nuclear energy comes from nucleus of atoms which is released by nucleus fusion

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3 years ago

How are electrons involved in the formation of a bond between atoms?

gulaghasi [49]

Answer:

Explanation:

electrons can be more than det

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3 years ago

A negative ion has more question 1 options:

Dimas [21]

B, this would balance to a negative charge

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3 years ago