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A 4-m × 5-m × 6-m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 7 to 23°C within 15 min. Assuming no heat losses from the room and an atmospheric pressure of 100 kPa, determine the required power of the resistance heater. Assume constant specific heats at room temperature.
If the heading of a member function of a class ends with the word const, then the function members cannot modify the private member variables, but can modify the public member variables. the function members cannot modify the public member variables,..
Determine the maximum external pull, in each of the four gears, for a tractor with 23-hp, and a max speed of 3.6 mph in 1st gear and a efficiency of 92%. When it is operated over a haul road whose slope is +2.53%.
Consider a beam of length 1.5L(meters) with hinge support and roller support from both the ends (respectively left and right) at distance of L/4. The beam is subjected to triangular loading from 0 to q KNper meter.(left to right)
The number of flaws on a sheet of aluminum manufactured by a certain process follows a Poisson distribution. In a sample of 100m2 of aluminum, 200 flaws are counted.
A cyclone has been designed with an inlet width of 10cm and an inlet height of 6cm. The height of the main upper cylinder is 16cm and the height of the lower cone is 16cm. The inlet gas velocity is 16m/s and the particle density
A truck driver used sand to soak up a 1 g spill of lindane (C6H6Cl6). He placed the contaminated soil in an open drum which then filled with 150 L of water during a rainstorm. You test the water and find a concentration of 17 M/L.
Three point loads 10,000, 7500 and 9000 kN act in line 5m apart near the surface of a soil mass. Calculate the vertical stress at a depth of 4m vertically below the centre (7500kN) load.
How is this optimal loading changed if the maximum truck speed is changed from 35 to 45 mph or to 25 mph? What would these changes do to the cost of this particular job?
What is the maximum column load in kips that could be placed on a 4-ft square temporary footing on a sand for which the standard resistance is about N=15 and the water table is at the surface
Derive an expression for small flow rates over a spillway, in the form of a function including dimensionless quantities. Use dimensional analysis with the following parameters
If the heat pump requires a power input of 2 kW, and the room requires a heat input of 15 kW to maintain the temperature at 25°C, (a) find the COP of the heat pump. (b) Determine if the heat pump is reversible, irreversible, or impossible.
the contractor ran out of gunite mixture and finished the deep corner of a 5-m-wide swimming pool, with a quarter circle pipe of PVC pipe. compute the horizontal and vertical forces on the curved panel AB.
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