Suppose we want to use a hot brick at tbrick= 400 k to power an engine which is in contact with another thermal reservoir with tres=300 k. at what temperature of the brick will the engine stop doing work?

What would people living along the coast in south florida do if there was a hurricane warning? move to locations away from the water flock along coasts to watch the natural phenomenon buy instruments to predict the exact location of the hurricane measure water levels to know the exact time of the hurricane