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Rina8888 [55]
3 years ago
7

Alex and Izzy are conducting an experiment to see what natural material could best be used for insulating pipes to keep them fro

m freezing in the winter. What is the independent variable of their experiment?
Physics
1 answer:
Reptile [31]3 years ago
3 0
Ur answer would be the pipes



I am ur mom so i know
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Una barra de hierro cuya longitud inicial es de 2m se le incrementa su temperatura de 20 °C a 120 °C ¿Cuál es la longitud final
Ksivusya [100]

Answer:

1.9976 m

Explanation:

An iron bar whose initial length is 2m has its temperature increased from 20 ° C to 120 ° C. What is the final length of the bar? (consider that the coefficient of expansion of iron) is 1.2 x 10-5 1 / ° C (3 points)

Given that,

Initial length of an iron bar, L_0=2\ m

The temperature increased from 20°C to 120°C

The coefficient of expansion of iron is 1.2\times 10^{-5}\ /^{\circ} C

We need to find the final length of the bar.

The linear expansion equation is given by :

\Delta L=\alpha L\Delta T

Where \Delta L is the change in length

\Delta L=1.2\times 10^{-5}\times 2\times (120-20)\\\\=0.0024\ m

Also, \Delta L = L_o-L

L is final length

0.0024= 2-L\\\\L=2-0.0024\\\\=1.9976\ m

So, the final length of the bar is 1.9976 m

8 0
2 years ago
A construction crane lowers a beam into place at constant speed. Consider the work Wg done by gravity on the beam and the work W
aalyn [17]

Answer:

Wg is positive and WT negative.

(Letters in options are all wrongly written).

Explanation:

Remember that the work of a force is the internal product between the force and the displacement W=F.d.

Since the displacement is downwards like the weight, the work done by gravity is positive, while the work done by the tension is negative since it points upwards.

5 0
3 years ago
A car accelerates uniformly in a straight line
julia-pushkina [17]

The car travels a distance <em>d</em> from rest with acceleration <em>a</em> after time <em>t</em> of

<em>d</em> = 1/2 <em>a</em> <em>t</em>²

It covers 69 m with 2.8 m/s² acceleration, so that

69 m = 1/2 (2.8 m/s²) <em>t</em>²

<em>t</em>² = 2 (69 m) / (2.8 m/s²)

<em>t</em> ≈ 7.02 s

where we take the positive square root because we're talking about time *after* the car begins accelerating.

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3 years ago
To calculate the velocity of an object the of the position vs time graph should be calculated
frutty [35]
<span>The vertical axis represents the velocity of the object</span>
3 0
3 years ago
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Sedbober [7]

Answer: Colby we both dumb if we need brainly lol

Explanation:

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