If a solar power plant generates electricity at an average rate of 5 megawatts (MW) per hour and operates for 10 hours each day, how much energy does it produce in a year?
First, let's calculate the amount of energy produced by the solar power plant daily:

Energy produced daily = Power generation rate * Operating hours per day
                                 = 5 MW * 10 hours
                                 = 50 MWh (megawatt-hours)

Next, we need to find out how much energy is produced in a year. Assuming the solar power plant operates every day:

Energy produced yearly = Energy produced daily * Days per year
                                   = 50 MWh * 365
                                   = 18,250 MWh

So, the solar power plant produces approximately 18,250 megawatt-hours of energy per year. This is a simplification, as factors such as weather conditions, maintenance, and fluctuations in solar radiation can affect the actual amount of energy produced.