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A room 4x5x6 meter is heated by a baseboard resistance heater. We want the heater to raise the room temperature from 7 to 23 deg C in 15 minutes. There are no heat losses from the room, and specific heat may be assumed constant. Power costs 15 cents per kilowatt hour.
What power is required to heat the room?
How much will it cost for one 15 minute episode of heating?
What is the average length between adjacent air molecules during this process?
Water at 72 degress Fahreneit flows through a 110-ft-long, 5-in-diameter wrought-iron pipe that contains the following fittings: one open globe valve, one medium-radius elbow
To verify the constant of a particular prism, a straight line EFG is laid out. The EDM instrument is first set up at E, with the following measurements recorded: EG = 426.224 m, EF = 277.301 m.
A tank contains 0.05 m^3 of nitrogen gas at -21 C and 10 MPa. Determine the mass of nitrogen, in kg, using: a) the ideal gas model b) data from the compressibility chart Comment on the applicability of using the ideal gas model for nitrogen at thi..
Calculate the surface area required for a stabilization pond to serve a domestic population of 1000. Assume 80 gpcd at 210 mg/l of BOD. Use a design loading of 20 lb of BOD/acre/day.
A centrifugal pump is used to pump water from ariver. The absolute velocity V2 = 82ft/s is at an angle of 25 degrees to theradial direction. The impeller's thickness is of 1.2 in and r2= 0.86 ft and rotates at a speed of 1250 rpm.
You have a standard card deck of 52 cards. Select one card, find P[heart/ace]. B.) You have a deck of 51 cards, which happens to be missing the eight of diamonds, Find P(heart/ace). C.) In the situation above find P (spades/8).
Determine the min coefficient of static friction between tires and the road surface so that the 1.5Mg car does not slide as it travels at 80km/h on the curved road. Neglect the size of the car.
How much contact time would be reuired for inactivating Giardia cysts using the following chemicals at the concentrations and temperatures stated: a. Chlorine Dioxide, 23C, 1.0 mg/L b. Chlorine, 12C, 1.6 mg/L c. Ozone, 10C, 5 mg/L d. Chloramines, ..
A certain gas has a molecular mass of 40. It is under a pressure of 2.5atm and a temperatature of 25 Degree Celsius. Determine its density and pressure in CGS absolute units.
WATER FLOWS IN A PIPE AT 3 m/s A valve at the end of the pipe is suddenly closed. determine the pressure rise in the pipe.
The flywheel of a prototype car engine is under test. The angular position of the flywheel is given by x = (3.0rad/s3)t3 and the diameter of the flywheel is 36cm.
the pressure drop over 15 m of 2-cm diameter galvanized iron pipe is measured to be 60 Pa. If the pipe is horizontal, estimate the flow rate of water. use for water v=10^-6 m^2/s and density of water = 1000kg/m^3
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