A typical daily shower uses 25 litres of water at 42 degrees celsius. If the incoming mains water is at 8 degrees celsius, how much energy in kWh (to two decimal places), is used? Note: SHC of water = 4186 J/kgk Answer:
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Q: A toaster has a Nichrome (oa-4.5x10 °C) heating element that has a resistance of Ro- 80 2 at a…
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- A 125 ml pyrex flaskfilled with water to thebrim was heated to 85Celsius. Initial temperatureof both flask and water is15 Celsius.Another activity in the labwas done whereincontainer B was filled with125 ml liquid Ato the brim and wasexposed to the sameconditions. Find the ratio ofamount overflow of waterto that of liquid AConstant for water = 2.1x10^-4/CelsiusConstant for pyrex= 0.09 x10^-4/ CelsiusConstant for liquid A 1.0 x10^-4/CelsiusConstant for container B=0.2 x 10 ^-4Metabolizing 1.0 kg of 3.7 x 107J fat results in about ofinternal energy in the body. (a) In one day, how much fatdoes the body burn to maintain the body temperature of aperson staying in bed and metabolizing at an average rateof 95 W? (b) How long would it take to burn 1.0 kg of fatthis way assuming there is no food intake?Burning a gallon ofgasoline releases 1.19 * 108J of internal energy. If a certain carrequires 5.20 * 105J of work to drive one mile, (a) how muchheat is given off to the atmosphere each mile, assuming the cargets 25.0 miles to the gallon? (b) If the miles per gallon of the caris increased, does the amount of heat released to the atmosphereincrease, decrease, or stay the same? Explain.
- The burning of gasoline in a car releases about 3.0 x 104 kcal/galIf a car averages 41 km/gal when driving 110 km/hwhich requires 25 hp, what is the efficiency of theengine under those conditions?Arent you gonna convert 8000ft-lb to btu first?On a walk a person burns aboout 336 cal/h nif the walk were done at 4.1 mi/h how many hours would it take to burn off 1 lb of body fat? (a pound of body fat storese an amount of chemical energy equivalent to 3,500 Cal)
- Can carbon dioxide be liquefied at room temperature (20ºC)? If so, how? If not, why not?There are two important isotopes of uranium, U235 and U238 ; these isotopes are nearly identical chemically but have different atomic masses. Only U235 is very useful in nuclear reactors. Separating the isotopes is called uranium enrichment (and is often in the news as of this writing, because of concerns that some countries are enriching uranium with the goal of making nuclear weapons.) One of the techniques for enrichment, gas diffusion, is based on the different molecular speeds of uranium hexafluoride gas, UF6 . (a) The molar masses of U235 and U238F6 are 349.0 g/mol and 352.0 g/mol, respectively. What is the ratio of their typical speeds vrms ? (b) At what temperature would their typical speeds differ by 1.00 m/s? (c) Do your answers in this problem imply that this technique may be difficult?Assuming a silicon photovoltaic array attains 20% efficiency over a lifetime of 25 years of use, where it is exposed to an average insolation of 250 W/m2, what is the total energy output of 1 m2 of photovoltaic cells (in joules). What quantity of coal would it replace (at 33% net energy conversion efficiency)?
- When 120 mg of naphthalene, C10H8(s), was burned in a bomb calorimeter the temperature rose by 3.05 K. The standard enthalpy of combustion of naphthalene is -5157kJ/mol Calculate the calorimeter constant?Burning a gallon ofgasoline releases 1.19 * 108J of internal energy. If a certain carrequires 5.20 * 105J of work to drive one mile, (a) If the miles per gallon of the caris increased, does the amount of heat released to the atmosphereincrease, decrease, or stay the same? ExplainA sample of ozone (O3) is stored at x kelvin and 12.5 Pa. If the temperature is doubled to 2x kelvin, what will the new pressure be?