67 .A 15 kg object is placed in sea water, with a density of 1.03 g/cm and the apparent weight of the object is 92 N, what is the density of the unknown metal?

2. A pipe with a diameter of 1.25 m flows into another pipe of diameter of 0.90m. The speed of the water in the first pipe is 4.5 m/s, what is the speed in the second pipe?

3. How many moles of CO gas can be in a 3200 mL container at 27C and a pressure of 1125 mmHg?

4. What is the new area of a copper plate that is 50 mm long, 30 mm wide, and 10 mm high when it changes temperature from 25^oC to 65^oC? (thermal expansion coefficients of copper = 0.000017)

5. Water has a latent heat of fusion of 333 kJ/kg and a latent heat of vaporization of 2260 kJ/kg. How much heat is required to melt 150 g of ice?

6. The rms speed of a certain sample of ammonia molecules, with a molecular weight of 17 g/mol, is 328 m/s. What is the rms speed of carbon monoxide molecules, with a molecular weight of 28 g/mol, at the same temperature?

73. A system releases 125 kJ of heat while 104 kJ of work is done on the system. Calculate the internal energy of system.

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