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1. Heat transfer to a block of 1.5-kg ice at-10?C melts it to liquid at 10?C in a kitchen. Find the entropy change of the water.
2. In a sink, 5 L of water at 70?C is combined with 1 kg of aluminum pots, 1 kg of flatware (steel), and 1 kg of glass, all put in at 20?C. What is the final uniform temperature and change in stored entropy, neglecting any heat loss and work?
3. A piston/cylinder has constant pressure of 2000 kPa with water at 20?C. It is now heated to 100?C. Find the heat transfer and the entropy change using the steam tables. Repeat the calculation using constant heat capacity and incompressibility.
torque (not shown) is applied to link AB through its lower pin to drive the links in a clockwise direction. When θ reaches 60° the links have an angular acceleration and an angular velocity of and respectively For this instant calculate the magnit..
A compressor pressurizes air from 1 atm to 2.38 atm at steady state. At the entry the air's temperature is 70F, whereas at the exit it has quadrupled (in degrees F). At the entry the air's volumetric flow rate is 17 ft3/s
Because of the axial compression of the deck in a cable stayed bridge, buckling is a concern. In this simple bridge, each pylon carries one frontstay and one backstay as shown.
A 2 m high sandy fill material was placed loosely at a relative density of 47%. Laboratory studies indicated tht the maximum and minimum void ratios of the fill material are 0.92 and 0.53, respectively
a.) Determine the maximum shear stress in a rectangular beam 6 in. wide and 8 in. deep produced by a shear force of 38,400 lb. b.) For the same section and shear force conditions of part (a) above.
A hollow rectangular steel beam is 18 cm deep by 10 cm wide, outside dimensions. The walls are 2 cm in thickness. From the shear and moment diagram, the maximum vertical shear on the section is 180 kN.
A rigid wall tank with volume of 2.5 m^3 initially contains ammonia at 20 degrees C, 150 kPa. The tank is attached to a supply line containing ammonia at 1200 kPa, 60 degrees C.
A 9 gram bullet is fired horizontally at a tree and is brought to a halt right before it exits the tree. the tree is 90cm thick and exerts a resistive force of 16000N on the bullet as it travels through the tree
What is the concentration of tracer in the reactor 1 h after tracer addition is terminated? The reactor had an initial concentration of tracer of 1.0 mg/L when tracer addition commenced.
Disregarding any heat transfer and pressure drops in the connecting lines between the components, show the cycle on a T-s diagram with respect to saturation lines
Air at 37 psi and 60oF is being forced into a tire at a velocity of 180 ft/s through a ¼ in. diameter opening. The tire has a volume of 17 ft3. Determine the rate of change of density in the tire. (3.01 *10-5 slugs/ft3 s)
a 30-acre field received 4 inches of rain with 35% runoff.Determine the volume of water infiltrated on the field ( assume all the water that doesn't runoff infiltrates )
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