89 Mega Joules can also be expressed as _____ a) 8900 Joules b) 89000000 Joules c) 89000 Joules d) 890000 Joules
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89 Mega Joules can also be expressed as _____
a) 8900 Joules
b) 89000000 Joules
c) 89000 Joules
d) 890000 Joules
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- A hot water heater in a residential home runs for an average of 3.7 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 an electric hot water heater if the cost of electricity is $0.19/kWh [round your final answer to zero decimal places]?How much energy in Joules is required to melt 415g of ice? The latent heat of fusion of ice is: Lf = 3.33 × 10³J/kg Do NOT include units in your answer. Round your answer to 2 decimal places. Do NOT change to scientific notation. Ignore significant figures.the average density of an atom is approximately 103 kg/m3. The nucleus of an atom has a radius about 10-5 times that of the entire atom, and contains nearly all the mass of the atom. What is the approximate density, in kilograms per cubic meter, of a nucleus?
- The recommended daily caloric intake is 2000 calories (8,400,000J). This is because this is the same value for how much the average body loses to heat and work in a typical day (your change in energy is zero because you take in the same amount of energy you lose). A) If you lose a total of 8,400,000J (Qout+W=total lost), but consume 1200 calories of food (5,000,000J), what would your change in energy be? B) Assuming your change in energy is negative (hint-it should be), where does your body get the extra energy to maintain it's temperature?A hot water heater in a residential home runs for an average of 2.9 hours per day with a heat energy input of 3.5 kW. What would be the annual cost for hot water in this home using an electric hot water heater if the cost of electricity is $0.14/kWh [round your final answer to zero decimal places]?A hot tub with a surface area of 28 ft2 is filled with water to a depth of 29 in . Hint: volume is calculated as area × height (A × h). A) What is the volume of water in the tub, in liters? Express your answer to two significant figures and include the appropriate units. B) How many kilojoules are needed to heat the water from 59∘F to 103 ∘F? Express your answer to two significant figures and include the appropriate units. C) If the hot-tub heater provides 5900 kJ/min, how long, in hours, will it take to heat the water in the hot tub from 59∘F to 103∘F? Express your answer to two significant figures and include the appropriate units.