You build yourself a carnot engine in your garage with a thermal efficiency of 38%. the hot reservoir has a temperature of 430 c. by how many degrees should the temperature of the cold reservoir be changed (don't forget to specific increased or decreased! ) to raise the engine's efficiency to 64%?

1. when conducting a test on what kind of music increases the growth of plants, all of the following would fail to meet to fair test standard except (1 point) using different kinds of plants. giving some plants more water than others. exposing the plants to different types of music. using nutrient-rich soil for one and lesser soil for others. 2. engineering uses scientific thinking to solve real-world problems. (1 point) true false 3. what does it mean to test a hypothesis? (1 point) pass a quiz on other scientists’ results analyze only the results from scientific sources not make assumptions about how an experiment will turn out see if the results of an experiment are what the scientist predicted