Answer:
the heat absorbed by the block of copper is 74368.476J
Explanation:
Hello!
To solve this problem use the first law of thermodynamics that states that the heat applied to a system is the difference between the initial and final energy considering that the mass and the specific heat do not change so we can infer the following equation
Q=mCp(T2-T1)
Where
Q=heat
m=mass=2.3kg
Cp=0.092 kcal/(kg C)=384.93J/kgK
T2=Final temperatura= 90C
T1= initial temperature=6 C
solving
![Q=(2.3kg)(384.93\frac{J}{kgC} )(90C-6C)=74368.476J](https://tex.z-dn.net/?f=Q%3D%282.3kg%29%28384.93%5Cfrac%7BJ%7D%7BkgC%7D%20%29%2890C-6C%29%3D74368.476J)
the heat absorbed by the block of copper is 74368.476J
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➷ When electrons are lost, a positive ion is formed. This is because there are now more protons than electrons causing the overall charge to be positive.
When electrons are gained, a negative ion is formed. This is because there are now more electrons than protons causing the overall charge to be negative.
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Here’s the answer, idk, it might be correct
Answer:
V = 0.05 m^3
Explanation:
The weight of the object of mass (m) and volume (V) in water is: 275 N and it is calculated using the buoyancy formula:
275 N = m g - V (dw) g
where (dw) is the density of water (1000 kg/m^3)
The weight of the object in oil is 325 N and it is calculated using the buoyancy formula as:
325 N = m g - V (do) g
where "do" is the density of oil which is: 0.9 x 1000 kg/m^3 = 900 kg/m^3
Therefore, subtracting term by term the two equations:
325 N -275 N = mg - mg - V (do) g + V (dw) g
50 N = V g (dw - do)
50 N = V g (1000 - 900)
50 N = V g (100)
solving for V (which will result in units of m^3):
V = 50 / 981 m^3
V = 0.05 m^3