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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.
A 175-g object is attached to a spring that has a force constant of 72.5 N/m, Find the locations of the object when its velocity is one-third of the maximum speed
What is new angular speed of the merry-go-round
q1. an iron bolt of mass 65.0 g hangs from a string 32.0 cm long. the top end of the string is fixed. without touching
A major-league catcher gloves a 85 mi/h pitch and brings it to rest in 0.17m. If the force exerted by the catcher is 803 N, what is the mass of the ball.
What is magnitude of the electric field
A sealed rigid tank contains 5.0 kg of water (liquid plus vapor) at 100 oC with a quality of 30.375%. Using the Thermodynamic Tables and the relationship between quality and other thermodynamic properties
An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. How far (in km) must he now travel to reach base camp
The speed of sound in air is 345 m/s. A tuning fork vibrates above the open end of a sound resonance tube. what is the frequency (in Hertz) of the tuning fork
Light is incident from one medium with an index of refraction of 2.29 at an angle of 29.12 degrees with respect to the normal to the surface. The light then passes into another medium with a refractive index 1.44. With what angle is the light refr..
A cylnder holds .5 moles of an ideal gas at temp 334K. The gas expands isothermally from an initail volume of .03 m^3 to a final volume of .4m^3
A section of hollow pipe and a solid cylinder have the same radius and mass. Which has the most rotational kinetic energy
At what angle should the road bank on the curve so that no frictional force is required by a vehicle travelling around the curve at the speed limit.
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