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ddd [48]
3 years ago
9

Help me answer these plz it's physics energy transfer

Physics
2 answers:
jekas [21]3 years ago
8 0
Why doesn't cold air escape out of the top of a freezer?
The cold air cannot get out of the top of the freezer. The lid forms a seal preventing air from escaping. Furthermore, the lid and sides of a freezer is made from an insulating material. Insulators prevent heat transfer, keeping the cold inside the freezer and the warm outside.

Heat transfer in solids takes place by conduction. Describe the process of conduction in terms of particle movement.
Conduction is the method of heat transfer requiring direct contact. The molecules of solids are typically held  in tight lattices where they are mostly immobile. However, when they are heated the particles become more energetic and move about more. In this higher energy state, the particles collide more frequently. As they collide, energy is transferred allowing the solid to heat more uniformly.
raketka [301]3 years ago
4 0
Cold air cannot escape a freezer due to there being no conductors for it to transfer heat with in other words no other energy to transfer with
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What is the net force on a 116 kg woman free falling at 97 m/s who has reached terminal velocity.
natta225 [31]
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3 years ago
How high does the water rise in the bell after enough time has passed for the air to reach thermal equilibrium
Minchanka [31]

The height risen by water in the bell after enough time has passed for the air to reach thermal equilibrium is 3.8 m.

<h3>Pressure and temperature at equilibrium </h3>

The relationship between pressure and temperature can be used to determine the height risen by the water.

\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}

where;

  • V₁ = AL
  • V₂ = A(L - y)
  • P₁ = Pa
  • P₂ = Pa + ρgh
  • T₁ = 20⁰C = 293 K
  • T₂ = 10⁰ C = 283 k

\frac{PaAL}{T_1} = \frac{(P_a + \rho gh)A(L-y)}{T_2} \\\\\frac{PaL}{T_1} = \frac{(P_a + \rho gh)(L-y)}{T_2} \\\\L-y = \frac{PaLT_2}{T_1(P_a + \rho gh)} \\\\y = L (1 - \frac{PaT_2}{T_1(P_a + \rho gh)})\\\\y = 4.2(1 - \frac{101325 \times 283}{293(101325\  +\  1000 \times  9.8 \times  100)} )\\\\y = 3.8 \ m

Thus, the height risen by water in the bell after enough time has passed for the air to reach thermal equilibrium is 3.8 m.

The complete question is below:

A diving bell is a 4.2 m -tall cylinder closed at the upper end but open at the lower end. The temperature of the air in the bell is 20 °C. The bell is lowered into the ocean until its lower end is 100 m deep. The temperature at that depth is 10°C. How high does the water rise in the bell after enough time has passed for the air to reach thermal equilibrium?

Learn more about thermal equilibrium here: brainly.com/question/9459470

#SPJ4

3 0
2 years ago
An object at rest has equal forces acting on it. This can be described as a(n) _____________ force.
san4es73 [151]
Answer. Balanced
Explanation. Balanced forces provides an equal reaction to each action. For example, if you push on a wall, your hand isn’t going to go through. This is because the push is equal to the pull and the forces are balanced.
Hope this helped, let me know if it’s correct so others can use it :)
Good luck
4 0
3 years ago
PLEASE HELP ASAP<br>Explain how can a ripple tank be used to view wave pattern.
Ivan

Answer:

when you push up and down the pencil right in the middle of the water tank. it will produce ripples. If seen at the perfect angle you will observe the waves

Explanation:

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Air is forced from the bottom of a rocket and it lifts off. This
TEA [102]

Answer:

balanced force should be correct answer

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4 years ago
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