ers the quest your 1. Which BEST expresses the first law of thermodynamics? A. The total energy, including thermal energ

[answerhappygod]

Ers The Quest Your 1 Which Best Expresses The First Law Of Thermodynamics A The Total Energy Including Thermal Energ 1 (55.88 KiB) Viewed 63 times

Ers The Quest Your 1 Which Best Expresses The First Law Of Thermodynamics A The Total Energy Including Thermal Energ 2 (43.73 KiB) Viewed 63 times

Ers The Quest Your 1 Which Best Expresses The First Law Of Thermodynamics A The Total Energy Including Thermal Energ 3 (43.73 KiB) Viewed 63 times

Ers The Quest Your 1 Which Best Expresses The First Law Of Thermodynamics A The Total Energy Including Thermal Energ 4 (53.92 KiB) Viewed 63 times

ers the quest your 1. Which BEST expresses the first law of thermodynamics? A. The total energy, including thermal energy, in a system and its surroundings remains constant over time. B. The total amount of kinetic energy and gravitational energy of a system and its surroundings remains constant. C. An object in motion tends to stay in motion with the same velocity unless acted upon by an unbalanced force. D. The total amount of mechanical energy of a system and its surroundings remains constant. 2. Which statement represents the second law of thermodynamics? A. Thermal energy always flows naturally from a cold object to a hot object and never naturally from a hot object to a cold object. B. There are some processes that can remove thermal energy from a source and convert it entirely into mechanical energy. C. Some mechanical processes can have an efficiency of 100% with no loss of thermal energy. D. Work is needed to make thermal energy move from a cold substance to hot substance.
1 2 3. Which device is a heat pump? A. a fan B. a jet engine C. a wall heater D. an air conditioning system 4. On being introduced to the laws of thermodynamics, a student retorted, "When the brakes of a moving car are applied, the kinetic energy of the car does diminish and even drops to zero when the car comes to a stop." The student thought that his observation about the car contradicted the first law of thermodynamics. Does the reduction of the car's kinetic energy really contradict the first law of thermodynamics? 5. In a refrigerator, energy is used to make thermal energy flow from the inside of the refrigerator to the outside. Use a law of thermodynamics to explain why thermal energy will not move in this direction naturally. 6. Some First Nations people traditionally heated water using stones that had been heated in a fire. These hot stones were placed in water held in leather bags. The stones would heat the water. Using a law of thermodynamics, explain why the stones caused the water to heat up.
7. Perpetual motion machines have fascinated people-especially inventors-for hundreds of years before the laws of thermodynamics became known. Ideally, once energy is added to start a perpetual motion machine in motion, the machine would continue to operate indefinitely. Using a law of thermodynamics, explain why such a machine cannot be produced. Return to page 121 of the Student Module Booklet and begin Section 3: Lesson 2. 8. In the technological development of engines, trial and error played an important role. Improved engines were often made by trial and error. That is, trying to overcome a drawback of an existing engine or the impracticality of a proposed engine design led to the development of a new engine. Match the engines in the following list with their drawbacks. Place your answer in the blank space given. - i. gunpowder engine iii. Newcomen engine ii. Savery engine iv. Watt engine a. The boiler could not withstand the steam pressure needed to lift water beyond 6 m. b. The engine had no mechanism to move the piston back to complete a cycle. c. The continual reheating needed after each cooling of the engine cylinder required a tremendous amount of thermal energy. d. This engine was large and massive and less efficient than thought possible.