8. While forming a 1.50 kg aluminum statue, a metal smith heats the aluminum to 2700 °C, pours it into a mould, and then cools it to a room temperature of 23.0 °C. Calculate the thermal energy released by the aluminum during the process.
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- What is the percent error of thinking the melting point of tungsten is 3695 instead of the correct value of 3695 K?(¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . The specific heat capacity of water is. Extremely high. If it were much lower, say, oneiiflh as large, what effect would this have on processes such as Fighting fires and cooling automobile engines?(¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) ¦ What happens to the atoms and molecules in a substance as its temperature increases?
- (¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . Is it possible to compress air without causing its internal energy to increase? If so, how?A person taking a reading of the temperature in a freezer in Celsius makes two mistakes: first omitting the negative sign and then thinking the temperature is Fahrenheit. That is, the person reads xC as xF . Oddly enough, the result is the correct Fahrenheit temperature. What is the original Celsius reading? Round your answer to three significant figures.1) Lake Erie contains roughly 4.00 x 1011m3of water. How much energy is required to raise thetemperature of that volume of water from 11.0°C to 12.0°C? How many years would it take to supplythis amount of energy by using the 1 000-MW exhaust energy of an electric power plant? 2) A scientist is trying to determine the specific heat of 10.0 g of an unknown substance. He heats up the substanceto a temperature of 100.0 C, and places it in 1.02 kg of water at 22.0 C. He notices that the final temperature ofthe water and substance is 23.1 C. What is the specific heat of the substance? 3)A 68 kg diver drops from a height of 12 m. What is her speed as she hits the water? 4) An incandescent bulb has a power rating of 75 W but is only 5 % efficient. How much energy is converted intolight if the bulb is run for 6.0 s ? 5) Determine the coefficient of friction for a floor if 550 J of work are done moving a 12 kg box 10.0 m at aconstant velocity. 6)About how much power does a70 kg sprinter…
- What else are you studying this term? Give an example ofa popular equation or formula from another course (thermodynamics,strength of materials, or the like) that doesnot satisfy the principle of dimensional homogeneity.Explain what is wrong and whether it can be modifi ed to behomogeneous.Presents the diagram of the problem, necessary formulas, clearance and numerical solution: How much heat is given off by 25 g of aluminum as it cools from 100 ◦C to 20 ◦C?A 10kg box slides down a 6 m long ramp that makes an angle of 25 degrees with the ground. Atthe bottom of the ramp, the box is moving 1m/s. If the specific heat is 2 joules per degree kg,How much did the temperature of the box change by and what is the coefficient of friction?
- The Kilauea volcano in Hawaii is the world’s most active, disgorging about 5×105 m3of 1200ºC lava per day. What is the rate of heat transfer out of Earth by convection if this lava has a density of 2700 kg/m3and eventually cools to 30ºC ? Assume that the specific heat of lava is the same as that of granite.How much steam with a temperature of 100° C must be added to 0.250 kg of ice at its melting point to end up with water at 25.0 C? Use the following values where appropriate:Super Invar, an alloy of iron and nickel, is a strong material with a very low coefficient of thermal expansion (0.20×× 10^-6 celcius). A 2.5 m -long tabletop made of this alloy is used for sensitive laser measurements where extremely high tolerances are required. A) How much will this alloy table expand along its length if the temperature increases 7.0 C∘? Express your answer to two significant figures and include the appropriate units. B) How much will a 2.5-m-long table made of steel expand along its length if the temperature increases 7.0 C∘? Express your answer to two significant figures and include the appropriate units.