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fenix001 [56]
3 years ago
14

what happens when two objects at different temperatures touch? Name one place where it occurs on Earth.

Physics
1 answer:
katen-ka-za [31]3 years ago
3 0
When two objects at different temperatures touch, heat flows from the warmer one to the cooler one. This makes the warmer object cool down, and the cooler object warm up. Heat continues to flow until their temperatures have become equal.

This happens in my bed, when my wife's cold feet touch my warm ankles. In that situation, this basic law of thermodynamics often seems violated, as her cold feet totally suck ALL of the heat out of mine, yet they still seem to remain cold.
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Answer:

800J

Explanation:

Using the formula for change in the internal energy of a system

∆U = Q - W

Q = heat added to the system

W =workdone by system.

We know the process is an adiabatic one then, there no addition/ removal of heat, then Q= 0

(∆U = -W )

Then substitute for W, we have

∆U = -[-800]

∆U= 800J

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3 years ago
A point charge q1 is at the center of a sphere of radius 20 cm. Another point charge q2 = 10 nC is located at a distance r = 10
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Answer:

q₁  = -2.92 nC

Explanation:

Given;

first point charge, q₁ = ?

second point charge, q₂ = 10 nC

net flux through the surface of the sphere, Φ =  800 N.m²/C

According to Gauss’s law, the flux through any closed surface (Gaussian surface), is equal to the net charge enclosed divided by the permittivity of free space.

\phi = \frac{q_{enc.}}{\epsilon_o}

where;

Φ is net flux

q_{enc.} net charge enclosed

ε₀ is permittivity of free space.

q_{enc.} = Φε₀

       = 800 x 8.85 x 10⁻¹²

       = 7.08 x 10⁻⁹ C

q_{enc.} = 7.08 nC

q₁ + q₂ = q_{enc.}

q₁ = q_{enc.} - q₂

q₁  = 7.08nC -  10 nC

q₁  = -2.92 nC

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If you stick it in pure water, it should read 1.00 . This is a good way to check your hydrometer and see whether it's reading correctly ("calibrated").

7 0
3 years ago
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