22. A 1.6-kg block of sample material is heated from 20.0°C to 65.0°C by the addition of 28 kJ of energy. Calculate its specific heat and identify the sample.
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- A 48.0 g sample of glass, which has a specific heat capacity of 0.670 J.g¯¹.°C¯¹, is dropped into an insulated container containing of water at 15.0 °C and a constant pressure of 1 atm. The initial temperature of the glass is 86.5 °C. 200.0 g Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has the correct number of significant digits. [°C x10 X1. A student wants to cool 0.25kg of diet soda (mostly water), initially at 25°C, by adding ice initially at -20 °C. How much ice should she add so that the final temperature will be 0 °C with all the ice melted if the heat capacity of the container maybe neglected? Cwater = 4, 186 J/kg-Cº Answer: Cice=2.09 x 103 J/kg-Cº L₁= 3.35 x105 J/kg mice = 0.069 kg (69 g)14.
- In an experiment, a 125-g sample of an unknown metal is heated to 98.0°C. The metal is then placed into a 25.0-g aluminum calorimeter cup (with c = 900 J/kg.°C) containing 200-g of water at 20.0°C. When equilibrium is reached, the final temperature is 28.2°C. What is the specific heat of the unknown metal? %3D 637.2 J/kg-°C 673.7 J/kg.°C 679.9 J/kg.°C 788.5 J/kg.°C А. D. В. 808.0 J/kg.°C Е. С. 775.2 J/kg.°C F.Consider a 0.63 kg sample of metal at room temperature of 20 deg C. The addition of 642,000 J increases its temperature to its melting point (782 deg C). An additional 59,000 J causes the sample to completely liquify. a). What is the specific heat capacity of the sample? b). What is the heat of fusion of the sample?A piece of iron block moves across a rough horizontal surface before coming to rest. The mass of the block is 2.8 kg, and its initial speed is 2.2 m/s. How much does the block's temperature increase, if it absorbs 78% of its initial kinetic energy as internal energy? The specific heat of iron is 452 J/(kg · °C). 0.004 X °C
- A 0.075-kg ice cube at -30.0°C is placed in 0.375 kg of 35.0°C water in a very well-insulated container. The latent heat of fusion for water is Lf = 79.8 kcal/kg. Part A: What is the final temperature of the water, in degrees Celsius?6. A 25.5g aluminum block is warmed to 65.4 °C and plunged into an insulated beaker containing 55.2 g of 22.2 °C water. Assuming no heat is lost, what is the final temperature of the wet aluminum system?1. How much heat energy is required to raise the temperature of 3 kg of aluminium by 10°C? 2. 3 kJ of heat is supplied to a 4 kg block of lead. What would be the rise in temperature of the block? 3. In an experiment on specific heat capacity an electric heater supplied 14 475 J of heat energy to a block of copper and raised its temperature by 15°C. What mass of copper was used in the experiment? 4. 6900 J of heat is supplied to 0.5 kg of methylated spirit in a plastic beaker and raises its temperature by 1.5°C. What is the specific heat capacity of methylated spirit?
- 12 Assume Lake Huron contains 3.60 x 10-2 m³ of water, and assume the water's density is that of water at 20°C and 1 atm. (a) How much energy (in J) is required to raise the temperature of that volume of water from 12.8°C to 23.6°C? 1.627e24 From the density of water and the volume, what is the mass of the water? What is specific heat? How is it related to the energy input, mass, and temperature change? Use it to solve for the energy. Be careful with units. J (b) How many years would it take to supply this amount of energy by using a power of 1,400 MW generated by an electric power plant? yr1.Furnace oil has a heat of combustion of 44MJ/kg.Assuming that 70% of the heat is useful,how many kilograms of oil are required to raise the temperature of 2000kg of water from 20°C to 99°C? 2.10kg of steam at 100°C is condensed by passing it into 500kg of water at 40.0°C.What is the resulting temperature?17. A 1 kg cube of lead is heated from 12.5 °C to 65.4 °C. How much energy is required to heat the lead ? (assume: specific heat for lead is 0.129 J/ gºC) SINDI 18. A block of mass 12 kg is pushed along a smooth frictionless surface with a two constant forces, F₁ = 100 N at the angle of 100 above the horizontal, and the F₂ = 50 N at the angle of 200 above the horizontal. The block is displaced 2.6 m. Calculate the total work done by block.