Which elements can be found in the sun?
2 answers:
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Answer:
<h3>Density = 0.5 g/cm³</h3>Explanation:
Density of a substance can be found by using the formula
From the question
mass = 32g
To find the density we must first find the volume of the block
From the question the block is a cuboid
Volume of cuboid = length × width × height
length = 8 cm
width = 4 cm
height = 2 cm
Volume of block = 8 × 4 × 2 = 64 cm³
Substitute the values into the above formula and solve for the density
That's....
We have the final answer as
Density = 0.5 g/cm³
The block will float because it's density is less than the density of water which is
1 g/cm³
Hope this helps you
Answer :
(a) The amount of work performed in this process is -26.6 J
(b) The value of change in internal energy is 0 J and change in heat is 26.6 J
Explanation :
As per first law of thermodynamic,
where,
= internal energy
q = heat
w = work done
As we know that, the term internal energy is the depend on the temperature and the process is isothermal that means at constant temperature.
So, at constant temperature the internal energy is equal to zero.
The formula used for isothermally irreversible expansion is :
where,
w = work done
= external pressure = 0.389 atm
= initial volume of gas = 0.200 L
= final volume of gas = 0.876 L
Now put all the given values in the above formula, we get :
The work done by the system on the surroundings are, -26.6 Joules. In this, the negative sign indicates the work is done by the system on the surroundings.
Therefore, the amount of work performed in this process is -26.6 Joules.
q = - w = -(-26.6 J) = 26.6 J
Net heat transfer is, 26.6 J