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tatuchka [14]
3 years ago
13

As 390 g of hot milk cools in a mug it transfers 30 000 j of heat to the environment. whats is the temperature change of the mil

k? Specific heat of the milk is 3.9 j.g
Physics
1 answer:
Fed [463]3 years ago
8 0
You have to use the specific heat equation. 

Q = cmΔT where Q is the energy, c is specific heat, m is mass, and ΔT is change in temp.

So we can substitute our variables into the equation.

30000J = (390g)(3.9J*g/C)ΔT

Solving for ΔT, we get:

30000J/[(390g)*(3.9J*g/C) = ΔT

ΔT = 19.72386588C

I'm assuming the temperature is C, since it was not specified.

Hope this helps!
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T^{2}\propto a^{3} (1)

In other words: this law states a relation between the orbital period T of a body (moon, planet, satellite, comet, asteroid) orbiting a greater body in space (the Sun, for example) with the size a of its orbit.  

However, if T is measured in years (Earth years), and a is measured in astronomical units (equivalent to the distance between the Sun and the Earth: 1AU=1.5(10)^{8}km), equation (1) becomes:

T^{2}=a^{3} (2)

This means that now both sides of the equation are equal.

Knowing a=4 AU and isolating T from (2):

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T=\sqrt{(4 AU)^{3}} (4)

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T= 8 yearsThis is the period of the asteroid

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A string that is connected to a post at one end is used to transmit a sequence of pulses, each measuring 0.1 meters in amplitude.

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