##### Compose a short essay on African History focusing on the impact the Saharan Desert had on...

Compose a short essay on African History focusing on the impact the Saharan Desert had on the development of the continent.

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##### Define religion and discuss why people believe in religion? What is the difference between a myth...

1. Define religion and discuss why people believe in religion? What is the difference between a myth and doctrine? How does animism and animatism relate to sacred spaces and people’s belief systems? Compare and contrast the religious practices of the Australian Aborigines, and Yanomamo. What role has culture and environment played in the development of these religious systems and beliefs? Make sure to include examples from class, text and lecture.

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##### Why the temperature increase when flow rate of air increase in air-ch4 combustion, and equivalence ratio...

Why the temperature increase when flow rate of air increase in air-ch4 combustion, and equivalence ratio always uniforms ??

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##### A centrifugal pump delivers water at rate of 0.22 m3/s from a reservoir at a ground...

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'.

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##### When boiling​ water, a hot plate takes an average of 88 minutes​ [min] and 1515 seconds​...

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.]

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##### 1.) What role, if any, do aquifers depletion overdrawing of surface waters, and salinization of irrigated...

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?

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##### list the sequence of features that could form along a rocky, emergent coastline and describe how...

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

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##### Recall that there are four fundamental forces: the gravitational force, the electromagnetic force, the weak nuclear...

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.

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

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

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##### What causes Transgression and Regression? Transgression is the deepening water or an inland migration of coastline....

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?

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##### GEOLOGY QUESTIONS 6. The volcanic mountains of the Cascades are composed primarily of andesite. Andesite is...

GEOLOGY QUESTIONS

6. The volcanic mountains of the Cascades are composed primarily of andesite. Andesite is an intermediate igneous extrusive rock. Why are the Cascades volcanoes composed of andesite rather than basalt?

7. The article describes how the accretion of the Siletzia terrane around 60 million years ago “.. managed to bring everything to a grinding halt. It literally stopped the subduction and shut off the arc!” What does the author mean when she says “shut off the arc”?

9. Most of the fossils recovered in Washington State are not older than about 55 million years. Why do we not find older fossils in this region?

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##### A wastewater plant needs to reduce the methane content in water in a stripping tower to...

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 ???? ′ .

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##### Solid particles (diameter 1.5 x 10-4 m, average density = 2800 kg/m3) are settling in water...

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?

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##### 1. In what way is the Moon similar to the Earth? Group of answer choices takes...

1.

In what way is the Moon similar to the Earth?

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

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?

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?

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

very light and porous rocks

metals

water

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##### A 2-shell passes and 4-tube passes heat exchanger is used to heat process stream from 35°C...

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.

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