Chapter 14, Problem 1P

The ionization constant for water (Kw) is 9.311 × 10−14 at 60 °C. Calculate [H3O+], [OH−], pH, and pOH for pure water at 60 °C.

Water passes under a sluice gate in a horizontal rectangular channel of width 2.0 m. The depths of flow on either side of the sluice gate are 1.8 m and 0.3 m. Assuming no energy loss at the gate, calculate the force on the gate

Compute the pressure heat at m, in feet of fluid A, indicated by open manometer in figure 2 below when (a) Fluid A is oil (sp gr 0.851), the gage liquid is carbon tetrachloride (sp gr 1.51), y=30.15 in, z=3051 in. (b) Fluid A is molasses (sp.gr 1.50), gage liquid is water, y=3.51 ft, z=1.15 ft

Residential annual energy use. For a house with: Air exchange rate of 0.5 h−1 Cp = 1000 J/kg.K Density of air = 1.2 kg/m3 Roof area = 144 m2; opaque wall area = 96 m2; window area = 24 m2; volume = 360 m3 Conductivity of Uwall = 0.60 W/(m2-K); Uwin = 3.0 W/(m2-K); Uroof = 0.40 W/(m2-K) Heating system efficiency of 0.85 Heating degree days (HDD) of 3500 K-days Calculate the Ktot for this house. Calculate the annual energy used to heat this house (in GJ).

A standpipe 8 m in diameter and 13 m high is filled with water. Calculate the potential energy of the water if the elevation datum is take 5 m below the base of the standpipe. (kN-m)   Round your answer to 2 decimal places.

An electric heater supplies (R+2.5)kW of power in the from of heat to water. If in 5.5 hours, 350kg of water is heated from - 10°C to 60°C, find the work done (W) of heater. Also calculate the amount of heat energy (Q) transferred to the water.  Consider the specific heat of water is 4184J/kg k.  R= 83

1   Which of the following produces pure water day and night? a. Passive solar water still b. Solar dryer c. Forced circulation water heater d. Active solar water still

Water flows through the turbine shown at a rate of 0.386 m3/s. The pressures at points A and B are 161.2 kPa and -19.6 kPa, respectively.  What is the electrical power generated by the turbine if it is 85% efficient?

Calculate the specific energy of 13 m3/s of water flowing with a velocity of 1.5 m/s in a rectangular channel 7.5 m wide. Find the depth of water in the channel when the specific energy would be minimum. What would be the value of critical velocity as well as minimum specific energy?