A power transmission line carries 520 A of current at a voltage of 924 kV. If the line has a resistance of 48 u/m, what is the rate at which energy is being dissipated (in kW) over 509 km of line?
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Rate of dissipation of energy?
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- A heat engine extracts 143 kJ from the hot reservior and exhausts 54.7 kJ into the cold reservior. The hot reservior is kept at 569K and the cold reservior is kept at 217K. what is the actual effciency of the engine? Give your answer as a percentage.A homogeneous pulley with two grooves consists of two wheels which turn together as one around the same axis. The moment of inertia of the two wheels together is ICM = 40 kg m2. The radii are: R1 = 1.2 m and R2 = 0.4 m. The masses that hang on both sides of the pulley are m1 = 36 kg and m2 = 12 kg. We will assume that the masses of the ropes are negligible. Determine the angular acceleration of the pulley, acceleration of the masses, and the tensions of the ropes.If 40 million Joules of energy is put into the hot reservoir and the engine transfers 22 million Joules of energy to the cold reservoir, what is the efficiency of the heat engine?
- Consider the following quantities: Heat Energy, Work, Change in Internal Energy and Change in Entropy. Identify which quantities are path dependent and which are not.It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg man runs on a treadmill for 30min and at a (total) metabolic energy expenditure rate of 1000W. Remembering that the human body has a 25% efficiency, estimate the amount of (mechanical) work done on the treadmill during that time. A) 450kJB)1350kJC)1000kJD)1800kJDoes a gas do any work when it expands adiabatically? If so, what is the source of the energy needed to do this work?
- Distinguish between reversible and inrreversible processes.In an ideal heat engine the cold sink is at 0∘C. If 10 kJ of heat is withdrawn from the hot source and 3 kJ of work is generated, at what temperature is the hot source?If you are told that the entropy of a system is zero, what do you know about the system?
- A certain heat engine does 9.5 kJ of work and 8.00 kJ heat transfer occurs to the environment in a cyclical process. (a) What was the heat transfer (in kJ) into this engine? kJ (b) What was the engine's efficiency (in percent)? %With 2.56×106 J of heat transfer into this engine, a given cyclical heat engine can do only 1.50×105 J of work.(a) What is the engine’s efficiency? (b) How much heat transfer to the environment takes place?A heat source generates heat at a rate of 63.0 W (1 W=1 J/s). How much entropy does this produce per hour in the surroundings at 27.2 ∘C Assume the heat transfer is reversible.