Find the pressure in kPa at which
a. water condenses if T = 195C.
b. the specific volume of saturated water vapor is 0.05 m3/kg.
Use the saturated steam tables.
a) From Table A-10, P = 1.3978 MPa = 1
An arctic explorer builds a temporary shelter from wind-pack snow. The shelter is roughly
hemispherical with an inside radius of 1.5 meters. After completing the shelter, the explorer crawls
inside and closes off the entrance with a block of snow. Ass
The roof of a house is partially covered with snow. The roof is made from plywood covered with
shingles (ksh = 0.4 Btu/hftoF). In the attic space, the heat transfer coefficient between the air and
the plywood is 3.1 Btu/hft2oF. The heat transfer coef
A 2000-kg car accelerates from 20 to 60 km/h on an uphill road. The car travels 120 m and the slope of the
road from the horizontal is 25o. Determine the work done by the engine.
Apply the first law choosing the car to be the system
The owners of a luxurious mountain resort want to install a fancy water fountain. The artists initial design
uses 75-m of 7.5-cm diameter commercial steel pipe ending in a nozzle with a diameter of 3.75-cm with a
40-kW pump to pull water from a lake
In a 3-hp compressor, carbon dioxide flowing at 0.023 lbm/s is compressed to 120 psia. The gas enters at
60oF and 14.7 psia. The inlet and outlet pipes have the same diameter. Find the final temperature and the
volumetric flow rate at the exit (in ft
Journal bearings are constructed with concentric cylinders with a very small gap between the two cylinders;
the gap is filled with oil. Because of the very small gap, the flow in the gap is laminar. Consider a sealed
journal bearing with inner and out
R-134a at 20oC and 200 kPa is heated at constant pressure. If the mass of refrigerant present is 6.2 kg
and the heat added is 380 kJ, determine the final state.
Apply the first law. Compute work from W = PdV .
Rewrite the first law in terms
A resistance heater is being used to heat a tank of nitrogen. If 3 amps are supplied to the resistor,
which has a resistance of 60 , how long will it take for 1200 J of work to be done?
Use the expression for electrical work, integrating
Water flowing in a horizontal pipe branches into two pipes as shown and issues into the atmosphere.
Neglecting all viscous effects, find the volumetric flow rate in each pipe and the diameter, D3.
Apply the Bernoulli equation between