During a workout, a person repeatedly lifts a 16-lb barbell through a distance of 1.1 ft. How many "reps" of this lift are required to work off 150 C?
Q: What is the change in internal energy of a system that takes in 4.43 106 J of heat, and does 4.50…
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Q: What is the change in internal energy of a system that takes in 2.83 106 J of heat, and does 4.50…
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A: Rocky spends all the afternoon hours watching sports on cable TV. In the process, he does 1118 J of…
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A: Given: Food energy can be viewed as molecular potential energy is discussed below.
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A: Consider the conversion formula as given below. 1 kcal=103 cal 1 cal=4.184 J
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A: Solution-Given thatAverage running hour of water heater per day (t)=2.5 hours=2.5×60×60 seconds=9000…
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A: Given Data: The input energy is: Qi=11100 J The output energy is: Qo=3700 J
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Q: 50 g of water is split into hydrogen and oxygen using electrolysis at 27oC. Calculate the work done.
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A: The weight of the woman is w=58 kg. The woman eats 555 kcal.
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A: Given Data:- The number of hours per day that the heater runs: 3.2 h/day=3.2×3600 s/dayThe energy…
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A: Given Information:- Electrical power generated by the plant is E=615.0 MW Waste heat H=1020.90 MW…
Q: Why do we not use brakes with more than 80% efficiency in automobiles? What should be the minimum…
A: we do not use brakes with more than 80% efficiency in automobiles
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- A weightlifter curls a 26 kg bar, raising it each time a distance of 0.65 m . How many times must he repeat this exercise to burn off the energy in one slice of pizza? Assume 25% efficiency. Energy content of one slice of pizza is 1260 kJA hot water heater in a residential home runs for an average of 2.2 hours per day with a heat energy input of 3.7 kW. What would be the annual cost for hot water in this home using a gas hot water heater if the cost of natural gas is $0.33/m3? The gas water heater can get 23 MJ of energy from 1 m3 of natural gas. [round your final answer to zero decimal places]?A 46-kg woman eats a 522 Calorie (522 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? 2.19 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. J (b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman-Earth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. 3.22 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairs (c) If the human body is only 26% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast? 8.4 X Your response is off by a multiple of ten. stairs
- The engine of a large ship does 1.97 1010 J of work with an efficiency of 8.60%. (a) How much waste heat is produced? (b) How many barrels of fuel are consumed if each barrel produces 6.00 109 J of heat when burned?What is the change in internal energy of a system which does 0.42 J of work while 8.87 J of heat transfer occurs into the system, and 8.87 J of heat transfer occurs to the environment? Give your answer in joules.An asteroid made out of iron (7860 kg/m3) strikes the Earth in an areawhere the oceans are very deep. The velocity of the asteroid upon impact isthe same for most debris hitting the Earth’s atmosphere, 30 km/s.The difference in potential energy from orbit to ground is negligible at thisspeed. Assuming that 80% of the asteroid’s kinetic energy is transferred toheating the water, what volume of water (assuming a density of 1000 kg/m3)will be vaporized? We will assume that the water is taken from 70o F tothe point that it becomes steam. Also, assume that the asteriod is spherical,with a radius of 750 m.
- An engine receives 660 J of heat from a hot reservoir and givesoff 420 J of heat to a cold reservoir. What are (a) the work doneA 120-pound woman working in an office expends about 2.2 3 103 kcal/day,whereas the same woman climbing a mountain needs 3.4 3 103 kcal/day. (a) How many joules per day does the woman expend in each activity? (b) How many seconds are in 1 day? (c) How many joules per second (5 watts) does the woman expend in each activity? (d) Which consumes more power (watts), the office worker or a 100-W light bulb?You propose to climb several flights of stairs to work off the energy you took in by eating a 900 calorie hot fudge sundae. How high must you climb? Assume that your mass is 60.0 kg.
- The metabolic power for typing is 150 W for Lili, not a lot as you know probably. How long does it take to burn off the energy in a slice of apple pie, which energy content is 1680 kJ (400 food calorie), in minutes? (Try to stay active, working/studying in front of a computer is not the best exercise you can do for your body.) Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.Convert 7.13 ✕ 103 cal to the equivalent number of kilocalories (also known as Calories, used to describe the energy content of food), and joules. (a) kilocalories ?kcal (b) joules ?JIf mass of air in a house is 278.6376kg. And the specific heat of air is 1.0kj/kgK. How much heat energy is needed to heat air by 10K? Use Q=mc∆T