An engine does 15. 0 kj of work while exhausting 37. 0 kj to the cold reservoir. What is the efficiency of the engine?.

You want to test the hypothesis that smoking cigarettes increases the risk of lung cancer. in your experiment, you take 100 people of various ages and genders for each of your groups. one group smokes. the other group does not smoke. the group that does not smoke is called the group