A centrifugal pump delivers water at rate of 0.22 m³/s from a reservoir at a ground level to another reservoir to height 'h' through a vertical pipe of 0.2 m diameter. Both are open to atmosphere. Power input to pump is 90 kW and it operates with 75% efficiency . f=0.004 use g=9.8 m/s² density=1000kg/m³. Find 'h'.

When boiling​ water, a hot plate takes an average of 88 minutes​ [min] and 1515 seconds​ [s] to boil 170170 milliliters​ [mL] of water. Assume the temperature in the lab is 6969 degrees Fahrenheit. The hot plate is rated to provide 501501 watts​ [W]. If we wish to boil 170170 milliliters​ [mL] of acetone using this same hot​ plate, how long do we expect the process to​ take? Acetone has a boiling point of 5656 degrees Celsius. ​[Hint: you must determine the efficiency of the​ hotplate.]

1.) What role, if any, do aquifers depletion overdrawing of surface waters, and salinization of irrigated soil play in the water problems associated with the High pLAINS AQUIFER AND THE COLORADO RIVER BASIN? How are these issues affected by drought and by development?

2.)Explain whether each of the following represents the point or nonpoint source pollution: fertilizer runoff, thermal pollution from a PowerPoint plant, urban runoff, sewage from a ship and erosion sediment from deforestations. Which is more difficult to control nonpoint source or point source pollution? Why?

list the sequence of features that could form along a rocky, emergent coastline and describe how each feature is formed

Recall that there are four fundamental forces: the gravitational force, the electromagnetic force, the weak nuclear force, and the strong nuclear force. Select any two of these forces and compare them. Consider their relative strengths, the range of distances over which they operate, and why they are important.

Derive the kinetic equations (Michaelis-Menten equation) about 3 reversible inhibition kinetics: competitive inhibition, uncompetitive equation, and noncompetitive equation.

What causes Transgression and Regression?

Transgression is the deepening water or an inland migration of coastline. Regression on the other hand in water becoming shallow or the seaward migration of the coastline. What causes this to happen? What accounts for the ordering of rocks along the shoreline?

A wastewater plant needs to reduce the methane content in water in a stripping tower to 0.3 mol %. The liquid stream is entering the tower with a flow rate of 200 mole/h and contains 0.8 mol % methane. The tower uses pure air for stripping and its temperature and pressure are held constant at 300 K and 1 atm, respectively. The equilibrium relation for methane in the air-water system is ? = 1.2?. a) Find the minimum vapor flow rate required to achieve this separation. B) Find the number of stages required if the vapor flow rate is taken as 1.2 ???? ′ .

Solid particles (diameter 1.5 x 10^-4 m, average density = 2800 kg/m3) are settling in water at 30 °C. The properties of water at this temperature are viscosity (µ) = 8 x 10^-4 kg/m.s and density (p) = 996 kg/m3

a) What is the terminal velocity for the particles?

b) What would be the velocity of the system in a separator with an acceleration of 390 m/s2?

1.

In what way is the Moon similar to the Earth?

Group of answer choices

takes the same time to rotate on its axis

similar atmosphere

same gravity on the surface

2

We believe the maria on the Earth's Moon are

Group of answer choices

ancient impact craters in which lava beds welled up from inside the Moon

giant volcanoes produced when the Moon tried to get plate tectonics going

large rifts filled with colder material made when the Moon's surface was cooling

3

What is the source of the fine, powdery dust found on the Moon's surface?

Group of answer choices

it is the result of volcanic activity on the Moon over billions of years

it is sand, produced in exactly the same way sand is produced on the Earth's beaches

it is the result of many impacts, breaking surface rocks apart over billions of years

4

Which of the following is a way that the planet Mercury is similar to the Moon?

Group of answer choices

the highest temperature on the two worlds is the same

it has a significant atmosphere

its surface is heavily cratered

5

The most likely models of the planet Mercury indicate that more than half the planet may be composed of

Group of answer choices

very light and porous rocks

metals

water

A 2-shell passes and 4-tube passes heat exchanger is used to heat process stream from 35°C to 80°C by hot water available at 90°C, which enters the thin-walled 2.5-cm-diameter tube with total length of 65 m. The convection heat transfer coefficient is 76 W/m2 .°C on the process stream (shell) side and 190 W/m2 .°C on the water (tube) side. For a desired factor, FT = 0.95

a) Determine the rate of heat transfer in the heat exchanger.

b) Consider a fouling factor of 0.0012 m2 ·°C/W at the inner and outer surfaces of tube, determine the new rate of heat transfer

c) Evaluate the mass flow of hot water needed to compensate the heat loss due to fouling. Assume cp of hot water is 4.2 J/g.°C.

d) If the existing operating conditions are to be remained unchanged, evaluate the new area to compensate the heat loss due to fouling.

Describe the Golden Age in Athens. When was it and what events conspired to create it? Who is Pericles and what were his contributions (both politically and culturally) to Athens?

1. Which of the following are necessary conditions for thunderstorm development?

     _______a. moisture in the air

     _______b. instability

     _______c. a lifting process

     _______d. (all of the above)

2. Rapid precipitation growth starts to take place in thunderstorm cell during which stage of evolution?

     _______a. cumulus or developing

     _______b. mature

     _______c. dissipating

     _______d. (any of the above)

3. A long narrow band of closely spaced thunderstorm cells is called a

     _______a. supercell.

     _______b. mesoscale convective system.

     _______c. squall line.

     _______d. Texas brawl.

4. Which type of thunderstorm generally produces the strongest tornadoes?

     _______a. multicell thunderstorm complex

     _______b. air mass thunderstorm

     _______c. supercell

     _______d. squall line thunderstorm

5. The rotating updraft of a mesocyclone is the result of

     _______a. twisting and turning.

     _______b. bobbing and weaving.

     _______c. tilting and stretching.

     _______d. shaking and baking.

6. For supercell formation, you need

     _______a. warm moist air near the surface.

     _______b. a lower tropospheric southerly flow with strong vertical wind shear.

     _______c. an unstable atmosphere.

     _______d. (all of the above)

7. Which region of the continental United States experiences the most days with large

    hail per year?

     _______a. the Great Plains.

     _______b. central Florida.

     _______c. the Pacific Northwest.

     _______d. New England.

8. Which of the following statements is false?

     _______a. Tornadoes form only in thunderstorms.

     _______b. Tornadoes form only in supercell thunderstorms.

     _______c. Tornadoes come in varying sizes and shapes.

     _______d. The strongest tornadoes are comparatively rare.

9. The season of maximum tornado frequency in the continental United States is

     _______a. winter.

     _______b. spring.

     _______c. summer.

     _______d. fall.

10. The only hazard usually associated with most air mass thunderstorms is

     _______a. large hail.

     _______b. hurricane force downburst winds.

     _______c. strong tornadoes.

     _______d. lightning.

11. The diameter of the largest tornado ever recorded was around

      _______a. 500 feet.

      _______b. 1,000 feet.

      _______c. one-half mile.

      _______d. two and one-half miles.

12. The majority of U.S. tornadoes move in which direction?

      _______a. toward the northeast

      _______b. toward the south

      _______c. toward the west

      _______d. toward the northwest

1. When the first people arrived, the new town of Las Venturas benefitted from an abundant water supply thanks to regular precipitation runoff and the nearby Buenaventura river. However, 70 years later the City of Las Venturas - that now straddles the river - faces growing water stress. Describe and explain two possible causes of this change. [2 Marks]

2. Summarize the personal water footprint you calculated as a part of the Lab #6 pre-lab activity. Based on the results of the extended estimate, what are the three most effective actions that you would be willing to take to lower your personal water footprint. Which of the blue, green, and grey components of your water footprint would each of these actions most reduce? Reflect honestly on how successful you would be likely to be in making such an attempt to reduce your water use. [4 Marks]