<span>The water is held behind a dam, forming reservoir. The force of the water being released from the reservoir through the dam spins the blades of a giant turbine.</span>
We can solve the problem by using the first law of thermodynamics:
![\Delta U= Q-W](https://tex.z-dn.net/?f=%20%5CDelta%20U%3D%20Q-W%20)
where
is the variation of internal energy of the system
Q is the heat added to the system
W is the work done by the system
In this problem, the variation of internal energy of the system is
![\Delta U=U_f-U_i=134 J-87 J=47 J](https://tex.z-dn.net/?f=%20%5CDelta%20U%3DU_f-U_i%3D134%20J-87%20J%3D47%20J%20)
While the heat added to the system is
![Q=500 J](https://tex.z-dn.net/?f=%20Q%3D500%20J%20)
therefore, the work done by the system is
![W=Q-\Delta U=500 J-47 J=453 J](https://tex.z-dn.net/?f=%20W%3DQ-%5CDelta%20U%3D500%20J-47%20J%3D453%20J%20)
Answer:
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias, literally "milky", a reference to the Milky Way.
Explanation:
And.. where is the rest of the question?
Answer: If x + y = a, xxy = b and x • a = 1 , then 2 (a~ - l)a- a x b (b2 ... xy-plane, then the vector in the same plane having projections