Answer:
![T_{f}=227K](https://tex.z-dn.net/?f=T_%7Bf%7D%3D227K)
Explanation:
Given data
Initial temperature of air Ti=300 K
Vf (final volume of air)=2Vi (initial volume of air )
To find
Final temperature
Solution
Since no energy is lost by thermal conduction during the process we categorize this process as an adiabatic one.Hence we apply;
![T_{i}V_{i}^{Y-1}=T_{f}V_{f}^{Y-1}\\T_{f}=T_{i}(\frac{V_{i}}{V_{f}} )^{Y-1}\\](https://tex.z-dn.net/?f=T_%7Bi%7DV_%7Bi%7D%5E%7BY-1%7D%3DT_%7Bf%7DV_%7Bf%7D%5E%7BY-1%7D%5C%5CT_%7Bf%7D%3DT_%7Bi%7D%28%5Cfrac%7BV_%7Bi%7D%7D%7BV_%7Bf%7D%7D%20%29%5E%7BY-1%7D%5C%5C)
Where air is predominantly a diatomic gas Y=1.4m
Substitute the given values
So
![T_{f}=300K(\frac{V_{i}}{2V_{i}} )^{1.4-1}\\T_{f}=227K](https://tex.z-dn.net/?f=T_%7Bf%7D%3D300K%28%5Cfrac%7BV_%7Bi%7D%7D%7B2V_%7Bi%7D%7D%20%29%5E%7B1.4-1%7D%5C%5CT_%7Bf%7D%3D227K)
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Answer is d using a heavier string
Answer:
10 million joules or 10,000 KJ
Explanation:
Work= Force x Displacement
convert 5km into meters -5km=5000m
W= 2000N x 5000m
w=10,000,000 Joules
or 10,000KJ
Work energy theorem states that net work done by forces on an object equals a change in kinetic energy
therefore
a) you push on a box and it moves