14_InstSolManual_PDF_Part4 - 14-4 Chapter 14 14.23 Set Up(a...

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14.23. Set Up: (a) The initial kinetic energy of the car is converted to heat. (b) The heat Q calculated in (a) causes a temperature rise of the car. From Table 14.3, the specific heat capacity of iron is Solve: (a) The initial kinetic energy of the car is The car stops, so (b) so Reflect: 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 Q required to raise the temperature of the water. Set this energy equal to the initial kinetic energy of the bullet. Water has a density of and so 1.0 L of water has mass 1.0 kg. From Table 14.3, the specific heat capacity of water is Solve: gives and 14.26. 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 Q transferred to the water. From Table 14.3, the specific heat capacity of water is Solve: The kinetic energy lost by the bullet is so for the water gives Reflect:
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