# 4 - 1 is the quality of being plastically elongated...

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1. ________ is the quality of being plastically elongated. Plasticity 2. 0.2 kg of air is compressed slowly from 150 kPa and 40 o C to 600 kPa, in an adiabatic process. Determine the final volume. 0.0445 m 3 3. 1 ft-lb is equivalent to ___Joules. 1.356 4. 2 m 3 of an ideal gas are compressed from 100 kPa to 200 kPa. As a result of the process, the internal energy of the gas increases by 10 kJ, and 140 kJ of heat is transferred to the surroundings. How much work was done by the gas during the process? -150 kJ 5. A 0.2-m<sup>3</sup> tire is filled withh 25<sup>o</sup>C air until <i>P</i> = 280 kPa. The mass of air in the tire is nearest==0.888 kg 6. A 0.2-m 3 rigid conyains steam at 600 kPa and a quality of 0.8. If 1000 kJ of heat are added, the final temperature is nearest==670 o C 7. A 1.5 cm solid shaft rotates at 1800 rpm. If the allowable torsional shearing stress is 50 Mpa, what power in kW the said shaft can transmit? 6.24 kW 8. A 10 g blocks slides with a velocity of 20 cm/s on a smooth level surface and makes a head on collision with a 30 gram block moving in the opposite direction with a velocity of 10 cm/s. If the collision is perfectly elastic, what is the velocity of the 30-gram block after the collision? - 5 cm/s 9. A 10 Kg block rests on a smooth surface. If the pulleys are massless and frictionless, the block's initial acceleration is - 10.00 m/s 2 10. A 10 kg blocks rests on a smooth surface, compute the blocks initial acceleration. 5 m/s 2 11. A 10 m 3 uninsulated tank contains nitrogen at 2 Mpa and 250 o C. The temperature of the environmnet surrounding the tank is 35 o C. Disregard the mass of the tank. What entropy change do the surroundings experience after a long period of time?==67kj/k 12. A 100 kg weight rests on a 30° inclined plane. Neglecting friction how much pull most one exert to bring the weight up the plane? 50 kg 13. A 120-V electric resistance heater draws 10 A. It operates for 10 min in a rigid volume. Calculate the work done on the air in the volume.==720kJ 14. A 19-foot beam 10 inches wide and 20 inches high supports 1500 lb/ft on two supports 14 feet apart. The right end of the beam extends 2 feet past the support. What is the shearing stress midway between supports? - 2.0 psi

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15. A 2.5 in. diameter shaft is 2 ft. long. Its maximum shear stress is 10, 000 psi. What is the angular deflection in degrees? - 0.96 o 16. A 20 lb block is moving along a smooth surface. If the normal force on the surface at A is 10 lb, the velocity is______. 10.6 ft/s 17. A 200kg crate is on top of a 5m-hill. Its potential energy with respect to the bottom of the hill is -- 9.80x10 3 J 18. A 200kg crate is on top of a 5m-hill. Its potential energy with respect to the bottom of the hill is 9.8e3 J 19. A 200-mm-diameter piston is lowered by increasing the pressure from 100 kPa to 800 kPa such that the P - V relationship is PV 2 = const. What is the work done on the system if V 1 = 0.1 m 3 ? -18.3 kJ 20. A 2-m 3 rigid volume contains water at 80
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4 - 1 is the quality of being plastically elongated...

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