A 0.030-kg lead bullet hits a steel plate, both initially at 20oC. The bullet melts and splatters on impact. (This action has been photographed.) Assuming that of the bullet’s kinetic energy goes into increasing its temperature and then melting it, what is the minimum speed it must have to melt on impact?
Answer to relevant QuestionsThe temperature of a lead block and a copper block, both 1.0 kg and at 20 oC, is to be raised to 100 oC. (a) The copper will require (1) more heat, (2) the same heat, (3) less heat than the lead. Why? (b) Calculate the ...Explain why the process shown in Fig. 12.1b is not that for an ideal gas at constant temperature. Diesel engines are more efficient than gasoline engines. Which type of engine wold you expect to run hotter? Why? A gas is enclosed in a cylindrical piston with a 12.0-cm radius. Heat is slowly added to the gas while the pressure is maintained at 1.00 atm. During the process, the piston moves 6.00 cm. (a) This is an (1) isothermal, (2) ...2.0 kg of ice melts completely into liquid water at 0 oC. (a) The change in entropy of the ice (water) in this process is (1) positive, (2) zero, (3) negative. Explain. (b) What is the change in entropy of the ice (water)? ...
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