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hungtistic
28.05.2020 •
Physics
A 15.53 kg loose bag of soil falls 5.50 m at a construction site. If all the potential energy of the fall is retained by the soil in the bag, how much will its temperature increase? (csoil = 0.200 kcal/kg oC)
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Ответ:
The rise in temperature is 0.064 ⁰C
Explanation:
Given;
mass of loose bag of soil, m = 15.53 kg
height of fall, h = 5.50 m
Potential energy of the fall, U = mgh
U = 15.53 x 9.8 x 5.5
U = 837.067 J = 0.200 kCal
If all the potential energy of the fall is retained by the soil in the bag, then the potential energy of fall is equal to thermal energy of the soil.
U = Q = mcΔθ
where;
Q is quantity of heat retained by the soil in the bag
m is mass of the loose bag of soil
c is specific heat capacity of the soil = 0.200 kcal/kg ⁰C
Δθ is increase in temperature
Δθ = U / mc
Δθ = 0.2 / (15.53 x 0.2)
Δθ = 0.064 ⁰C
Therefore, the rise in temperature is 0.064 ⁰C
Ответ:
Equal to 30°C.
Explanation:
The final temperature of both objects are equal to 30°C because of the conduction heat from one object to another. Both objects have same mass of 2 kg and both were isolated from the external environment so conduction of heat occurs from the more hotter body to the less hotter body until the temperature of both objects are equal to each other.