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4 years ago

12

The wires connecting the switches, light-bulbs and buzzers must start and end at the power source before the circuit can work. T

he power source could be a A) battery.
B) light-bulb.
C) switch.
D) wire.

2 answers:

MakcuM [25]4 years ago

4 0

A IS THE FINAL ANSWER :)

Lelu [443]4 years ago

3 0

A) Battery. (I suck at explaining things by the way so sorry I only said A please just trust me)

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3 years ago

The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glas

DochEvi [55]

Answer:

b. 3 times

Explanation:

Lets take

Coefficient for ordinary glass = α₁

Coefficient for pyrex glass = α₂

Given that α₁ = 3 α₂

Initial length of both glasses are equal = L

Change in the temperature is also same .= ΔT

We know that change in the length given as

ΔL = L α ΔT

Therefore

$\dfrac{\Delta L_1}{\Delta L_2}=\dfrac{L\alpha_1\Delta T}{L\alpha_2\Delta T}$

$\dfrac{\Delta L_1}{\Delta L_2}=\dfrac{3\alpha_2}{\alpha_2}$

ΔL₁ = 3ΔL₂

Therefore change in the length of original glass is three time of pyrex glass.

b. 3 times

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