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(1) A constant-pressure insulated piston-cylinder device contains 1.7 kg of saturated liquid-vapor mixture of water at 150 kPa with an initial quality of 0.2. Energy is then added to the system by an electric heater until all the liquid is vaporized. The environment is at 99 kPa and 2°C. Calculate the change in exergy of the contents in kJ.
(2) Air is cooled from 128°F to 62°F at a rate of 0.8 lbm/s in a heat exchanger. The coolant is water that enters the exchanger at 36°F and 0.6 lbm/s. What is the rate of exergy destruction in this heat exchanger, in units of Btu/s? Assume atmospheric pressure and negligible pressure drop in both fluids, and the environment is 46°F.
Multiple-Concept Example 10 provides one model for solving this type of problem. Two wheels have the same mass and radius of 5.0 kg, Find the net external torque that acts on each wheel
when two light bulbs are connected in series bulb a is brighter than bulb b.if the positions of the bulbs were reversed
Two boys are sliding toward each other on a frictionless, ice-covered parking lot. Jacob, mass 45 kg, is gliding to the right at 7.67 m/s, What is their velocity immediately there after
Suppose a 34-kg child sits 1.24 m to the left of center on a seesaw of length, L= 3.74 m, pivoted in the middle. Find the normal force acting on the pivot point
Jack and Jill ran up the hill at 3.5m/s . The horizontal component of Jill's velocity vector was 2.5m/s . What was the angle of the hill? What was the vertical component of Jill's velocity?
A 80.0 Hz generator with an rms voltage of 150 V is connected in series to a 3.20 k ohm resistor and a 3.50 micro farad capacitor. Find the phase angle between the current and the voltage
A 20-m long spacecraft is passing by earth at 0.8c. What is the length of the spacecraft measured within the moving (spacecraft) referencee frame
spectroscopy is an important part of physics chemistry geology astronomy and many other sciences. explain what physical
Two small plastic spheres are given positive electrical charges. When they are a distance of 14.8cm apart, What is the charge on the second sphere
Bruce stands on a bank beside a pond, grasps the end of a 10.00-m long rope attached to a nearby tree and swings out to drop into the water. If the rope starts at an angle of 36° with the vertical, what is Bruce's speed at the bottom of swing.
q1. while a roofer is working on a roof that slants at 44.0 above the horizontal he accidentally nudges his 93.0
In lab, your instructor generates a standing wave using a thin string of length L = 2.10m fixed at both ends. What is the maximum transverse speed vy of the bead
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