1) if all the heat lost by 2.0 kg of water at 0 degrees celsiuswhen it turns int
ID: 1729792 • Letter: 1
Question
1) if all the heat lost by 2.0 kg of water at 0 degrees celsiuswhen it turns into ice at 0 degrees celsuis could turn into kineticenergy, what would be the speed of the ice?2) a lead bullet at 100 degrees celcuis strikes a steel plate andmelts. what was its minimum speed?
3) one way to produce fresh water from seawater is to boil seawaterand condense the steam leaving the salt behind.
a. find the minimum amount of heat needed to produce 1.0liter of fresh water from seawater at 18 degrees celsuis? (assumethat the specific heat and heat of vaporization of seawater andfresh water are the same)
b. at what rate must the energy be supplied to produce100,000 liters of fresh water per 24 hours by this method?
Explanation / Answer
mass m = 2 kg energy released when water is convered into ice Q =mL where L = letent heat of fusion of water = 334.88*10^ 3J / kg plug this value weget Q = 669.76* 10^3 J This energy is used for kinetic energy of the ice So, kinetic energy of the ice = Q ( 1/ 2) m v ^ 2 = Q from this velocity of the ice v = [2Q / m] = 25.87 m / s (b). melting point temperature of lead t ' = 327.5oC Initial temp t = 100 oC temp.differece dt = 227.5 oC Specifie heat of lead C = 130 J / kg oC Let the mass of lead be m then heat required to melt = kinetic energy of the leadbullet mCdt = ( 1/ 2) mv ^ 2 from tis required speed v = [ 2Cdt ] = 243.2 m / sRelated Questions
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