14.23.Set Up: (a)The initial kinetic energyof the car is converted to heat.(b)The heatQcalculated in(a) causes a temperature rise of the car. From Table 14.3, the specific heat capacity of iron isSolve: (a)The initial kinetic energy of the car is The carstops, so (b)soReflect:The stopping time (17 s) did not enter into the calculation.14.24.Set Up:The mechanical energy is Solve:7.2 food calories in 1.0 g of butter, so 14.25.Set Up:Calculate the heat energy Qrequired to raise the temperature of the water. Set this energy equal tothe initial kinetic energy of the bullet. Water has a density of and so 1.0 L ofwater has mass 1.0 kg. From Table 14.3, the specific heat capacity of water is Solve:gives and14.26.Set Up:The initial mechanical energy of the bird is For water,Solve:so 14.27.Set Up:Set the loss of kinetic energy of the bullet equal to the heat energy Qtransferred to the water. FromTable 14.3, the specific heat capacity of water is Solve:The kinetic energy lost by the bullet isso for the water givesReflect:
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