Explain why materials such as plastic foam, feathers, and fur are poor conductors of heat.

1 answer:

8 0

They are poor conductors because they keep the heat trapped in one spot, while other materials like metal let the heat go through itself.

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An ice cream machine produced 44 ice creams per minute. After reconditioning, its speed increase to 55 ice creams per minute. By

Slav-nsk [51]

Answer:

an ice cream machine produced 44 ice cream per minute.

Now, after reconditioning it speeds up to 55 ice cream per minute.

=> 55 - 44 = 11

=> 11 / 44 = 0.25

=> 0.25 * 100% = 25%.

thus it increased it production to 25%.

Explanation:

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3 years ago

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What % of an object’s mass is above the water line if the object’s density is 0.82g/ml?

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To develop this problem we will apply the Archimedes model. As well as the definitions of Weight based on mass and acceleration. The first in turn will be considered under the relationship of Density and Volume. From the values given we have to:

$\rho_w =1 g/mL \rightarrow \text{Water Density}$

$\rho_o = 0.82g/mL \rightarrow \text{Object density}$

Since it is in equilibrium, the weight of the object will have a reaction from the water, which will cause the sum of forces between the two objects to be zero, therefore

$\sum F= 0$