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3 years ago

Which practice fits the definition of conservation?

Physics

1 answer:

Doss [256]3 years ago

5 0

Answer:

recycling cans that contain a material like aluminum

Explanation:

Conservation of resources is the sustainable use of available resources to ensure their continuous availability.

Resources are limited in the environment and they cannot satisfy all of our wants. Therefore, we need to ration them in the best way possible.

Recycling is one of such ways in which materials are conserved.
In recycling is the process of converting wastes into new materials.
The metals won from the recycling cans can be used again and new aluminium prospects would not have to be mined again.

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(a) 392 N/m

Hook's law states that:

$F=k\Delta x$ (1)

where

F is the force exerted on the spring

k is the spring constant

$\Delta x$ is the stretching/compression of the spring

In this problem:

- The force exerted on the spring is equal to the weight of the block attached to the spring:

$F=mg=(2.0 kg)(9.8 m/s^2)=19.6 N$

- The stretching of the spring is

$\Delta x=15 cm-10 cm=5 cm=0.05 m$

Solving eq.(1) for k, we find the spring constant:

$k=\frac{F}{\Delta x}=\frac{19.6 N}{0.05 m}=392 N/m$

(b) 17.5 cm

If a block of m = 3.0 kg is attached to the spring, the new force applied is

$F=mg=(3.0 kg)(9.8 m/s^2)=29.4 N$

And so, the stretch of the spring is

$\Delta x=\frac{F}{k}=\frac{29.4 N}{392 N/m}=0.075 m=7.5 cm$

And since the initial lenght of the spring is

$x_0 = 10 cm$

The final length will be

$x_f = x_0 +\Delta x=10 cm+7.5 cm=17.5 cm$

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Answer:

Explanation:

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