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3 years ago

8

A mother pats a child every time he throws a chocolate wrapper in the dustbin. This is an example of (A) Observational Learning

(B) Negative Reinforcement (C) Spontaneous recovery (D) Positive Reinforcement

1 answer:

TEA [102]3 years ago

8 0

D. I think, not sure

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2 years ago

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If you drop a silver dollar off a building and it hits the ground in 10 seconds, how fast was the coin going just before?

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3 years ago

A ball is dropped off the side of a bridge. after 1.55 s, how far has it fallen

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3 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

2 years ago