50. Rubbing your hands together requires 450 J of energy and results in a thermal energy increase in your palms of 153 J. Calculate how efficiently the kinetic energy is converted to thermal energy.
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- 9. When an object doubles its speed, the kinetic energy increases by a factor ofa) 1 d) 6b) 2 e) 8c) 410. You raise a 1.00 kg object 1.00 m and then lower it 1.00 m. The total work done on the object bygravity isa) 0 J d) 19.6 Jb) 9.8 J e) – 19.6 Jc) – 9.8 J1. A typical tablet battery recharger provides 10 Watts of power. 60% of this power is converted to chemical potential energy of the battery while the rest is lost as heat. When filled, the rechargeable battery can hold 45,000 Joules of chemical energy. How long does it take to completely charge the drained battery?3. How long must a 400 W electrical engine work in order to produce 300 kJ of work?
- 2. How does the first law of thermodynamics apply to systems that are not isolated?3. How long could a 2000 Hp motor be operated on the heat energy liberated by 1 mi. of ocean water when the temperature of the water is lowered by 1 degree Celcius and if all these heat were converted to mechanical energy?12. The temperature of a rapidly expanding gas decreases. Explain why in terms of the first law of thermodynamics. (Hint: Consider whether the gas does work and whether heat transfer occurs rapidly into the gas through conduction.)
- 69. A Carnot refrigerator is used in a kitchen in which the temperature is kept at 301 K. This refrigerator uses 241 J of work to remove2561 J of heat from the food inside. What is the temperature inside therefrigerator?43) The compressor in a refrigerator performs 580 J of work to remove 160 J of heat from the refrigerator. How much heat is discharged into the kitchen? A) 340 J B) 420 J C) 540 J D) 640 J E) 740 J- Which of the following best explains why sweating is important to humans in maintaining suitable body temperature? A. Moisture on the skin increases thermal conductivity, thereby allowing heat to flow out of the body more effectively. B. Evaporation of moisture from the skin extracts heat from the body. C. The high specific heat of water on the skin absorbs heat from the body. D. Functioning of the sweat glands absorbs energy that otherwise would go into heating the body E. None of the above explains the principle on which sweating depends.
- 6 please help#1. What are the three mechanisms for heat transfer and how do they differ?bacon-cheddar-double-burger meal along with A 65.0-kg mountain climber just ate a Johnny Rocket's two peanut butter milkshakes, which have 5810 Calories (5810 kilocalories). Assume she can convert these calories into energy with 100% efficiency and use the fact that 1 kcal = 4186 J. Calculate how many times she could climb up Mt. Everest - the world's tallest mountain. The height of Mt. Everest is 8840 m.