Chapter 13.5, Problem 63P

Thermodynamics: Mass and Energy Analysis Of Control Volumes  An insulated piston-cylinder device contains 4 L of saturated liquid water at a constant pressure of 200 kPa.Water is stirred by a paddle wheel while a current of 8 A flows for 50 min through a resistor placed in thewater. If one-half of the liquid is evaporated during this constant-pressure process and the paddle-wheelwork amounts to 300 kJ, determine the voltage of the source. Also, show the process on a P–v diagram withrespect to the saturation lines.

Thermodynamics: Mass and Energy Analysis Of Control Volumes The state of liquid water is changed from 55 psia and 45◦F to 2000 psia and 120◦F. Determine the change inthe internal energy and enthalpy of water on the basis of the (a) compressed liquid tables, (b) incompressiblesubstance approximation and property tables, and (c) specific-heat model.

Thermodynamics: Mass and Energy Analysis Of Control Volumes What is the change in enthalpy, in kJ/kg, of oxygen as its temperature changes from 150 to 250◦C? Is thereany difference if the temperature change were from −50 to 100◦C? Does the pressure at the beginning andend of this process have any effect on the enthalpy change?

Thermodynamics: Mass and Energy Analysis Of Control Volumes  A 50-L electrical radiator containing heating oil is placed in a 50-m3 room. Both the room and the oil in theradiator are initially at 5◦C. The radiator with a rating of 3 kW is now turned on. At the same time, heatis lost from the room at an average rate of 0.3 kJ/s. After some time, the average temperature is measuredto be 20◦C for the air in the room, and 60◦C for the oil in the radiator. Taking the density and the specificheat of the oil to be 950 kg/m3 and 2.2 kJ/(kg◦C), respectively, determine how long the heater is kept on.Assume the room is well-sealed so that there are no air leaks.

Problem 3 For the beam and loading shown, consider section n-n and determine (a) the largest shearing stress in that section, (b) the shearing stress at point a. 1ft 15 kips 20 kips 15 kips AITT in 1 0.6 in. -10 in. 1 in. 0.375 in.- 2 ft 2ft 2 ft 2ft 10 in. 1 0.6 in.

practice problems want detailed break down

6.105. Determine force P on the cable if the spring is compressed 0.025 m when the mechanism is in the position shown. The spring has a stiffness of k = 6 kN/m. E P 150 mm D T 30° 200 mm 200 mm 200 mm B 800 mm

6.71. Determine the reactions at the supports A, C, and E of the compound beam. 3 kN/m 12 kN A B CD E -3 m 4 m 6 m 3 m 2 m

A countershaft carrying two V-belt pullets is shown in the figure. Pulley A receives power from a motor through a belt with the belt tensions shown. The power is transmitted through the shaft and delivered to the belt on pulley B. Assume the belt tension on the loose side (T1) at B is 30% of the tension on the tight side (T2). (a) Determine the tension (i.e., T₂ and T₁) in the belt on pulley B, assuming the shaft is running at a constant speed. (b) Find the magnitudes of the bearing reaction forces, assuming the bearings act as simple supports. (c) Draw shear-force and bending moment diagrams for the shaft (in XZ and XY plane if needed). (d) Calculate the maximum moments at points A and B respectively and find the point of maximum bending moment (A or B). (e) Find maximum stresses (tensile, compressive, and shear stresses) at the identified point of maximum moment (hint: principal and max shear stresses) 8 dia. 9 400lbf 50lbf 45° 1.5 dia. T₂ B Units in inches T₁ 10 dia.