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From year to year, the water level in a lake varies, as shown below. At which...
This question is worth 12 marks. A lake high up in the mountains supplies water to...
This question is worth 12 marks.
A lake high up in the mountains supplies water to a
hydroelectric power station similar to Trawsfynydd Lake shown in
Figure 1.
Figure 1 Trawsfynydd Lake that feeds water to
Maentwrog hydroelectric power station, Wales
The surface of the lake is 1000m above sea-level and the deepest
point in the lake is 180m below its surface. Assume that the water
has a uniform density of and
that
.
a.Figure 2 shows the cross-section of...
A hydroelectric power facility converts the gravitational potential energy of water behind a dam to electric...
A hydroelectric power facility converts the gravitational potential energy of water behind a dam to electric energy. What is the gravitational potential energy relative to the generators of a lake of volume 35 km3km3, (3.50×10133.50×1013 kg) given that the lake has an average height of 63 m above the generators? ΔPEg=_______________ units=________________
Level curves (isothermals) are shown for the typical water temperature (in °C) in Long Lake (Minnesota)...
Level curves (isothermals) are shown for the typical water temperature (in °C) in Long Lake (Minnesota) in 1998 as a function of depth and time of year. Estimate the temperature in the lake on August 28 (day 240) at a depth of 10 m and on October 7 (day 280) at a depth of 5 m x °C (day 240 and depth 10 m) 12 C (day 280 and depth 5 m) 20 12 16 8 20 16 12 8...
Consider a dam that is in the shape below with height H=80m. the density of water...
Consider a dam that is in the shape below with height H=80m. the
density of water is 1000kg/m^3. The far left side of the dam is
vertical wall 140m to the left of point B. The dam is 200m long ( Z
direction).
Consider a dam that is in the shape below with height He 80 m. The density of water is 1000kg/m. The far left side of the dam (not shown) is a vertical wall 140 m to the...
4 The homogeneity of the chloride level in a water sample from a lake was tested...
4 The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portion drawn from the top and from near bottom of the lake, with the following results in ppm C: Top 26.30 26.43 26.28 26.19 26.49 Bottom 26.22 26.32 26.20 26.11 26.42 CHE2614/101/3/2019 a) Apply the t test at 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom. b) Now...
A long history of testing water samples in a certain lake has shown that the level...
A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with standard deviation 5 mg/L. What is the minimum number of samples required to estimate today’s level to with in 0.5 mg/L with 91% confidence?
Q.5) Water backs up behind a concrete dam as shown in Figure below. Leakage under the...
Q.5) Water backs up behind a concrete dam as shown in Figure below. Leakage under the foundation gives a linear pressure distribution under the base of the concrete dam as shown in Figure. If the water depth H, is too great, the dam will topple over about its toe (Point A). For the dimensions given, determine the maximum water depth. Base your analysis on a unit length of the dam. The specific weight of the concrete is 23.7 kN/m”. (Answer...
29. The water temperature in a lake varies between 4°C in the winter and 24°C in...
29. The water temperature in a lake varies between 4°C in the winter and 24°C in the summer. However, the metabolic rate of the fish in the lake is constant throughout the year. How might this happen? a. The fish lower their body temperature in the summer and raise it in the winter. b. The fish express isozymes that have different optimal temperature at different time of the year. c. The fish become less active in the winter to conserve...
Dworshak Reservoir is a dammed lake near Orofino, ID. The water levels behind the dam can...
Dworshak Reservoir is a dammed lake near Orofino, ID. The water levels behind the dam can fluctuate over the course of a year (high in the spring, low in the summer). You want to carry out a change detection analysis of timber harvests between 2013 to 2015. You have a March 2013 Landsat 7 data set and an August 2015 Landsat 8 data set. Explain how you would do the analysis and what complicating factors may be present
1. The Davis Dam was constructed 67 miles downstream from the Hoover Dam. The reservoir formed...
1. The Davis Dam was constructed 67 miles downstream from the Hoover Dam. The reservoir formed by the dam is called Lake Mohave. The reservoir has a total storage capacity of 1,818,300 acre-feet. Given the average head of the reservoir is 136 feet, determine the potential energy of the water in the reservoir. 2. When the effective head of water behind the Davis Dam is 41 meters, a penstock 22 feet in diameter will flow 42,000 gallons of water per...
This question is worth 12 marks.
A lake high up in the mountains supplies water to a
hydroelectric power station similar to Trawsfynydd Lake shown in
Figure 1.
Figure 1 Trawsfynydd Lake that feeds water to
Maentwrog hydroelectric power station, Wales
The surface of the lake is 1000m above sea-level and the deepest
point in the lake is 180m below its surface. Assume that the water
has a uniform density of and
that
.
a.Figure 2 shows the cross-section of...
Level curves (isothermals) are shown for the typical water temperature (in °C) in Long Lake (Minnesota) in 1998 as a function of depth and time of year. Estimate the temperature in the lake on August 28 (day 240) at a depth of 10 m and on October 7 (day 280) at a depth of 5 m x °C (day 240 and depth 10 m) 12 C (day 280 and depth 5 m) 20 12 16 8 20 16 12 8...
Consider a dam that is in the shape below with height H=80m. the
density of water is 1000kg/m^3. The far left side of the dam is
vertical wall 140m to the left of point B. The dam is 200m long ( Z
direction).
Consider a dam that is in the shape below with height He 80 m. The density of water is 1000kg/m. The far left side of the dam (not shown) is a vertical wall 140 m to the...
4 The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portion drawn from the top and from near bottom of the lake, with the following results in ppm C: Top 26.30 26.43 26.28 26.19 26.49 Bottom 26.22 26.32 26.20 26.11 26.42 CHE2614/101/3/2019 a) Apply the t test at 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom. b) Now...
Q.5) Water backs up behind a concrete dam as shown in Figure below. Leakage under the foundation gives a linear pressure distribution under the base of the concrete dam as shown in Figure. If the water depth H, is too great, the dam will topple over about its toe (Point A). For the dimensions given, determine the maximum water depth. Base your analysis on a unit length of the dam. The specific weight of the concrete is 23.7 kN/m”. (Answer...
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