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Alex777 [14]
2 years ago
11

Which type of forces creates contact between surfaces?

Physics
2 answers:
Aneli [31]2 years ago
4 0

Answer:

Frictional Force: Frictional force is the force caused by the relative motion of two surfaces that come into contact with each other.

blagie [28]2 years ago
4 0
<h3>Frictional force</h3>

  • Friction are some strong bonds between two surfaces. It creates contact between surfaces.
  • If there will be no friction nothing will be at rest, everything will be moving.
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If you wanted to estimate how much money a certain appliance costs you, how would you do it?
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Interesting question.

There are a number of factors that may attribute to the pricing of an item say quality of material, number of special features available, and certainly a common notion of brand value (e.g H&M vs GUCCI). Of course, it does not necessarily mean more face value = more expensive.

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3 years ago
Is using a heater to keep warm when it is cold conduction convection or radiation
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2 years ago
Practical steam engines utilize 450ºC steam, which is later exhausted at 270ºC.
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(a) 0.249 (24.9 %)

The maximum efficiency of a heat engine is given by

\eta = 1-\frac{T_C}{T_H}

where

Tc is the low-temperature reservoir

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For the engine in this problem,

T_C = 270^{\circ}C+273=543 K

T_H = 450^{\circ}C+273=723 K

Therefore the maximum efficiency is

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(b-c) 0.221 (22.1 %)

The second steam engine operates using the exhaust of the first. So we have:

T_H = 270^{\circ}C+273=543 K is the high-temperature reservoir

T_C = 150^{\circ}C+273=423 K is the low-temperature reservoir

If we apply again the formula of the efficiency

\eta = 1-\frac{T_C}{T_H}

The maximum efficiency of the second engine is

\eta = 1-\frac{T_C}{T_H}=1-\frac{423}{543}=0.221

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