Calculate the maximum possible efficiency of a power plant that burns natural gas at a temperature of 600k, with low temperature surroundings at 300k. how much more efficient would the plant be if it were built in the arctic where the low temperature reservoir is at 250k? why don't we build all power plants in the arctic?

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.