Nancy ate a 500 Cal lunch. Neglecting efficiency issues (i. e., assuming 100% conversion of energy to work), to what height could Nancy raise a 50 kg weight with the energy from her lunch? (Remember, gravitational potential energy is given by: PE = m x g x h and the gravitational constant is equal to 9.81 m/s-2) The world uses approximately 25 billion kg of H2 per year to make ammonia for fertilizer. The energy cost for this process is approximately 30 GJ per metric ton H2 used. What is the average power requirement for this process, assuming that the ammonia production is approximately constant over a year?