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rewona [7]
3 years ago
11

How does the vacuum between the inner and outer walls of a thermos bottle limit energy loss through conduction and convection?

Physics
1 answer:
Vitek1552 [10]3 years ago
3 0
By having no solid matter between the walls (like styrofoam) conduction is eliminated since conduction requires matter to be in contact with other matter.  The vacuum state eliminates convection since that is the heating of gas that then carries the energy to another body by traveling there and exchanging heat with it.
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A man wishes to pull a crate 15m across a rough floor by exerting a force of 100 N. The
Darina [25.2K]

Answer:

option (E) is correct.

Explanation:

Work done is defined as the product of force and the distance in the direction of force.

force, f = 100 N

Coefficient of friction, = 0.25

distance = 15 m

So, net force F = f - friction force

F = 100 - 0.25 x m g

Work = (100 - 0.25 mg) x d cosθ

For minimum work, the angle should be maximum.

So, the value of θ is 76°.

thus, option (E) is correct.

3 0
3 years ago
What are flask used for primarily in the lab
Vlad [161]
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6 0
3 years ago
Why is cheese only strechy when its hot not when its cold (i spelt stretchy wrong but i dont want to change it cuz that would ta
IgorC [24]
That is a really good question, cheese is stretchy when it is hot is because when you heat it up, it liquefies which makes it stretch. it doesn't stretch when it is cold because it is a solid and solids usually do not stretch.
8 0
3 years ago
Why are many adults and youth in the United states overweight?
Anna11 [10]

Answer:

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Explanation:

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6 0
3 years ago
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An ion in a mass spectrometer follows a semicircular path of radius 14.8. What is the distance it travels?
aleksklad [387]

The circumference of a circle is (2π · the circle's radius).

The length of a semi-circle is  (1π · the circle's radius) =

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(The unit is the same as whatever the unit of the  14.8  is.)

7 0
3 years ago
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