A 6.0 kg block, starting from rest, slides down a frictionless incline of length 2.0 m. When it arrives at the bottom of the inc
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Answer:
1.
2.
Explanation:
Given:
length of copper cable,
diameter of copper cable,
current through the copper wire,
We have the resistivity of copper,
<u>We know that the resistance of a wire is given as:</u>
where:
cross sectional area of the wire
1.
<u>Now from the Ohm's law:</u>
2.
<u>From the Joules law the thermal energy generated as an effect of electrical energy is mathematically given as:</u>
<u />
where:
time duration for which the current flows
(∵ we have 3600 seconds in 1 hour)
The change in internal energy of the gas is 
.
In fact, the 1st law of thermodynamics states that the change in internal energy of a system is equal to the amount of heat given to the system (Q) plus the work done on the system (W):
In this example, no work is done on the bottle so W=0, while the heat given to the system is
, so the change in internal energy of the gas is
In fact, the 1st law of thermodynamics states that the change in internal energy of a system is equal to the amount of heat given to the system (Q) plus the work done on the system (W):
In this example, no work is done on the bottle so W=0, while the heat given to the system is