.
. centre de ressources dilemmes et doutes le visage humain de mathématiques Qui sommes-nous Problème de mois activités de promotion babillard
Centrale des maths - centraledesmaths.uregina.ca
Dilemmes & doutes
« D & D »
. .
topic card  

Sujet:

water

liste de
sujets
. .
nouvelle recherche

73 articles trouvés pour ce sujet.
 
Page
1/1
A tank, 5/9 full of water 2020-07-28
Nat pose la question :
A rectangular tank contains 1200cmsquare of water when it is 5 out of 9 full . Its base area is 80cmsquare . Find the height of the tank.
Penny Nom lui répond.
A one foot rise in water level 2019-09-15
Stuart pose la question :
If a lake were to rise one foot - how many linear feet would it spread onto the shore line ? What is the correlation - 1 foot of a rise = 10 feet onto the shore ? Does it depend on the lake size - if so Lake Ontario in Canada.
Penny Nom lui répond.
The volume of water in a pipe 2019-03-21
Abati pose la question :
How can I calculate the volume of water in a pipe with below details;

Pipe diameter - 6 inches
Length of pipe - 127meters

Penny Nom lui répond.
A cylinder with a cone on top 2019-01-16
Berania pose la question :
A water tower in New York City has the shape of a cylinder with a cone on top. The cylinder has a diameter of 12 feet and a height of 15 feet. The roof has an inclination angle of 25 degrees.
(a) Determine the height of the cone to the nearest tenth of a foot.
(b) Determine the overall volume of the tower to the nearest cubic foot.

Penny Nom lui répond.
5 mm of water over 1 hectare 2018-08-10
Joyce pose la question :
Please help me with this question.
How many tonnes of water fell on 1 hectare of land during a rainfall of 5mm?

Penny Nom lui répond.
The price of a watermelon 2018-07-07
errin pose la question :
the price of the watermelon is directly proportional to its weight. If a watermelon that weighs 22 pounds cost $5.40, how much will a 17.5 pound watermelon cost?
Penny Nom lui répond.
Water in a cone 2018-02-10
Shuvo pose la question :
The diagram shows a vertical cross-section of a container in the form of an inverted cone of height 60 cm and base radius 20 cm. The circular base is held horizontal and uppermost. Water is pursed into the container at a constant rate of 40 cm3/s.
Show that, when the depth of water in the container is x cm, the volume of the water in the container is (πx^3)/27 cm3.
Find the rate of increase of "x" at the instant when "x" = 2.

Penny Nom lui répond.
Water leaking from a trough 2016-12-28
Kathryn pose la question :
A trough is 6 m long, and has uniform cross-section of an equilateral triangle with sides 1 m. Water leaks from the bottom of the trough, at a constant rate of 0.1 m3/min. Find the rate at which the water level is falling when the water is 0.2m deep.
Penny Nom lui répond.
Travelling upstream and downstream 2016-10-17
Kathleen pose la question :
It took a boat 2 hours to reach town A going upstream. The way back was 1h20 min. What is the speed of the boat in still water if the speed of the stream is 3 mph?
Penny Nom lui répond.
A graph of the water level of a river 2016-01-05
emoni pose la question :
Suppose that the water level of a river is 34 feet and that it is receding at a rate of 0.5 foot per day.
Penny Nom lui répond.
Water in a spherical container 2014-10-17
Natalie pose la question :
A spherical container with radius 10cm being filled with water such that the water level, h cm, in the container increase at a rate of 0.5 cm s^(-1). Show that the area of the horizontal surface of water, A cm^(2), in the container is given by A = π(20h - h^(2) ).
Penny Nom lui répond.
Water usage in Ames 2014-08-29
Abigail pose la question :
The City of Ames water treatment plant treats 7 million gallons of water per day on average to meet water demands. Hypothetically, if water is withdrawn from a groundwater system with an area of 51.6 square miles (approximate area of Ames and surrounding area), what is the depth of water in inches that would have to be added to the groundwater system annually to replace the water that is withdrawn by the city?
Penny Nom lui répond.
Mixing water and wine 2014-01-19
manish pose la question :
a man mixes three part of water to one part of wine.When he consumes one part of mixture he realise that the drink is too dilute and hence adds one part of wine to the remaining quantity what is the ratio of water to wine in the new mixture.
Penny Nom lui répond.
Cubic centimeters, milliliters and grams 2013-09-26
Laura pose la question :
How do I find the volume of a cube with dimensions of .78 cm, .3 cm and .22 cm? Then find the volume in ML and the mass if filled with water?
Penny Nom lui répond.
Water use in a rectangular flush tank 2013-05-10
milo pose la question :
A rectangular flush tank 22" by 71/4 contains water to depth of 17" how many gallons of water will be saved if a conservation device reduces the capacity to 3/5 of this amount? And reduced to the nearest tenth
Penny Nom lui répond.
The weight of a pipe full of water 2013-01-16
joe pose la question :
how do you figure out the weight of a pipe full of water
Harley Weston lui répond.
A project on reclaiming water 2012-12-11
shannon pose la question :
I'm doing a report to reclaim water off of our campus facility to store in a cistern to use to flush toilets.

In Southeast Wisconsin and average of 82 inches of rain and snow fall annually. I want to collect that off of the roof of our school building. The roof is 37128 square feet. how many gallons annually could I collect?

Penny Nom lui répond.
A semi-circular roof gutter 2012-04-09
Kyle pose la question :
A semi-circular roof guttering contains some water.
The cross-section of the guttering has a diameter of 10 centimetres. The surface of the water collected in the guttering is 8cm. What is the depth of water in the gutter?

Penny Nom lui répond.
A water tank is in the shape of a truncated cone 2012-03-08
Victoria pose la question :
Suppose you have a water tank in the shape of a truncated cone. The larger diameter is K, the smaller diameter is K/2, and the height is also K (all measured in meters). The force of gravity on an object of mass, m, is F=9.8m (measured in Newtons). The density of the water is 1000 kilograms per cubic meter. What is the volume of the tank and how much mass will the tank have when it is full?
Penny Nom lui répond.
A hemispherical bowl with a lead ball inside 2011-09-27
Jean pose la question :
"(a) Water is being poured into a hemispherical bowl of radius 3 inch at the rate of 1 inch^3/s. How fast is the water level rising when the water is 1 inch deep ?

(b) In (a), suppose that the bowl contains a lead ball 2 inch in diameter, and find how fast the water level is rising when the ball is half submerged."

Penny Nom lui répond.
A trough of water 2011-05-01
alvin pose la question :
A trough is formed by nailing together, edge to edge, two boards 11 ft. in length, so that the right section is a right triangle. If a 15 gallon of water are poured into the trough and if the trough is held level so that a right section of water is an isosceles right triangle, how deep is the water? (231cu.in=1 gal.)
Penny Nom lui répond.
A fence around a water tank 2011-02-01
Heath pose la question :
I am building a fence around a water tank. the fence is to be in the shape of a normal octagon. The tank has a circumference of 57 ' 6''. I would like the fence to be 3 ft from the tank at the skinny point . How would I calculate(for the simple guy) where to set each of my 4x4 posts at the 8 corners. Any help would be greatly appreciated.
Harley Weston lui répond.
A water trough 2010-10-22
Jasmine pose la question :
A water trough is 8 m long and its cross-section is an isosceles trapezoid which is 90 cm wide at the bottom and 120 cm wide at the top, and the height is 30 cm. The trough is not full. Give an expression for V , the volume of water in the trough in cm^3, when the depth of the water is d cm.
Stephen La Rocque lui répond.
How many cubic metres of water can safely be stored in the tank? 2010-09-10
susanna pose la question :
This water tank is a perfect sphere with an inner radius of 12 metres. However, they used inferior materials to build the water tank, and the tank can only withstand a water pressure of 185 kiloPascals. Assume the density of water is exactly 1000 kg/m3, gravity is 9.8 metres/s2, and disregard atmospheric pressure. How many cubic metres of water can safely be stored in the tank? Round DOWN to the nearest whole number (since rounding up could be catastrophic in this instance!), and please submit only a number with no other information.
Robert Dawson lui répond.
The number of gallons of water in a basement 2010-05-23
George pose la question :
A basement with dimensions 68 ft long by 42 ft wide by 10 ft deep is flooded to the ceiling calculate the number of gallons of water in the basement. 70
Penny Nom lui répond.
A trough of water 2009-09-15
Darrell pose la question :
A trough that measures 4 feet long, 22 inches wide, and 18 inches high will be mounted on a support stand. If the trough weighs 50 pounds when empty, approximately how many pounds must the stand be able to hold when the trough is full of water?
Penny Nom lui répond.
The volume of water in a cone 2009-03-17
Freddie pose la question :
A ball of diameter 20cm rests in a conical container whose angle with the slant height and the vertical axis is 25degrees. if water is poured into the container just enough to touch the bottom of the ball, find the quantity of water in the container.
Penny Nom lui répond.
The weight of water in a swimming pool 2009-03-10
ely pose la question :
How much does the water in a swimming pool 20 ft long, 10 ft wide, and 6 ft deep weigh?
Penny Nom lui répond.
Mixing watercolour paints 2008-09-07
bob pose la question :
So, I'm making a chart to help me mix watercolor paints. There are 25 different paints. Each paint will mix with another paint just 1 time. There is no need to mix red with blue, and then blue with red. Since the result is the same, we only need 1 combination of the 2 paints. And there is no need to mix red with red, so we can eliminate 25 combinations of the same paint.
Penny Nom lui répond.
A water acid mixture 2008-08-19
Sulagna pose la question :
A chemical solution is made by mixing an acid with water in the ratio 1:24. This solution is then taken and mixed with water in the ratio 1:3. How much acid would be there in 200ml of this final solution?
Penny Nom lui répond.
A cubic mile of water 2008-08-03
Fred pose la question :
[QQ] HOW MUCH WATER IS THERE IN A CUBIC MILE?
Stephen La Rocque lui répond.
The rate of change in the depth of the water 2008-06-12
Liz pose la question :
A rectangular pool 50ft long and 30ft. wide has a depth of 8 ft. for the first 20 ft. for its length and a depth of 3 ft. on the last 20ft. of its length and tapers linearly for the 10 ft in the middle of its length. the pool is being filled with water at the rate of 3ftcubed/ min at what rate is the depth of the water in the pool increasing after 15 hours?
Harley Weston lui répond.
The volume of a stone 2008-04-17
sara pose la question :
a rectangular tank 30 cm long and 20 cm wide is filled with water to a depth of 8 cm. When a stone was put in, the water level rose to 11 cm. Find the volume of the stone. (Assume that the stone is completely under water.)
Penny Nom lui répond.
The amount of water in a pool 2008-03-30
anurag pose la question :
what will the weight of water in a swimming pool having dimensions of 18ft *10ft*5 ft? how much water will be needed for filling it up?
Penny Nom lui répond.
How much does water weigh per gallon? 2008-02-18
sofie pose la question :
how much does water weigh per gallon
Penny Nom lui répond.
The volume of a tank 2008-01-27
Fred pose la question :
A cubic tank holds 1,000 kilograms of water what are the dimensions of the tank in meters?
Harley Weston lui répond.
Related Rates (a water trough) 2007-11-07
Christina pose la question :
A rectangular trough is 3ft long , 2ft across the top and 4 ft deep. If water flows in at the rate of 2ft^3/min, how fast is the surface rising when the water is 1 ft deep ?
Stephen La Rocque lui répond.
Can you tell me how many gallons it holds? 2007-09-25
Jeff pose la question :
Hi my water tank is 10ft long and 45" around,can you tell me how many gallons it holds.thankyou jeff
Penny Nom lui répond.
1 foot of snow = how much rain 2007-09-25
Lisa pose la question :
1foot of snow = how much rain
Penny Nom lui répond.
How much water is this? 2007-08-16
Judy pose la question :
Have an area 731 sq. ft with 5" of water all the way around. How many gallons is this? Your help is appreciated.
Stephen La Rocque lui répond.
Water bill woes 2007-08-12
Terry pose la question :
I know that a cubic foot of water=7.48051945 gals., but I keep getting my water bill and they go by thousands of a gal. per cubic foot. Is there a conversion that says that shows this? Water department=.763 x cubic foot used=thousands of gallons water used that month. Exampel: 72cu. ft meter reading x .763+ 58.--- galons of water I use in a month. Total 58=thousand = +gallons. This is wrong. There are only two people in the house.
Stephen La Rocque lui répond.
Comparing flow rates of two pipes 2007-07-14
Kenneth pose la question :
If two water pipes are 3 feet long, but one of them has a 1 foot diameter and the second has a 1 1/2 foot diameter, what simple mathematical method can be used to determine how much faster one pipe can drain water than the other pipe?
Stephen La Rocque lui répond.
Dried grapes and percentage of water content 2007-07-09
Jyoti pose la question :
Fresh grapes contain 90% water by weight while dried grapes contain 20 % water by weight. what will be the weight of dry graprs available from 20kg of fresh grapes?
Stephen La Rocque lui répond.
I need to provide 712 cubic feet to water storage capacity 2007-07-03
William pose la question :
I need to provide 712 cubic feet to water storage capacity. If I use 15 inch diameter pipe, what would the length need to be to provide the capacity?
Stephen La Rocque lui répond.
Water tank volume 2007-05-29
Cecelia pose la question :
I HAVE A SEMI CIRCULAR TANK AGAINST A WALL MEASURING 6'10" ACROSS THE WIDEST PART AND 3' FROM THE WALL TO THE FRONT OF THE TANK. THE DEPTH IS 14". PLEASE HELP ME TO CALCULATE THE VOLUME OF WATER IN THE TANK.
Stephen La Rocque lui répond.
Converting mass and volume of water 2007-05-10
Shian pose la question :
Hello please help, I just can't seem to get the convertion thing and my mom tried to help but I still don't get it. How many grams does 1 milliliter of water weight? I was told 1g. How many grams does 0.1 liter of water weight? I was told 0.1g. Can you tell me if the answers given are correct with an explaination that I can understand? Thank you.
Stephen La Rocque lui répond.
Calculating rainwater volume 2006-12-30
Mark pose la question :
Trying to calculate 1" rainfall on a 1000 sq' roof=how many gallons of water would collect in our cistern.
Stephen La Rocque lui répond.
3.253 cubic meters of water 2006-10-31
Elaine pose la question :
a tank full of water that has a volume of 3.253 cubic meters would have a mass of?
Penny Nom lui répond.
How fast is the water level rising when the water is 1 meter deep? 2006-10-19
Don pose la question :
The cross section of a 5-meter trough is an isosceles trapezoid with a 2-meter lower base, a 3-meter upper base and an altitude of 2 meters. Water is running into the trough at a rate of 1 cubic meter per minute. How fast is the water level rising when the water is 1 meter deep?
Stephen La Rocque lui répond.
How much water it will hold? 2006-09-20
Doug pose la question :
I have thirty feet of piping that is two inches in diameter and I want to know how much water it will hold and the equation for solving the answer.
Stephen La Rocque lui répond.
Litres of water in my swimming pool 2006-08-16
A student pose la question :
I need to calculate how many litres in my swiming pool, it is a circle shape, 5.5 m in diametre by 1.07 m deep.
Stephen La Rocque lui répond.
Gallons of water in a well 2006-07-31
Martha pose la question :
I have a shallow water well that is 30 feet in depth.

I have 8 feet of water in the well.

The water well is a 30 inch in diameter.

My question : How many gallons of water is in my tank?

Penny Nom lui répond.
Ounces of water to grams 2006-07-16
Liza pose la question :
How many grams is in 10 ounces? I'm asking this question because i just bought a sea monkey and it says add 10 ounces of water and I don't know what that means. I have asked my parents but neither of them know.
Stephen La Rocque lui répond.
Two water jugs 2006-07-05
Kisha pose la question :
suppose that you have two water jugs, one which holds three gallons and one which holds five gallons. in additions, you have a water faucet at your disposal. your job is to find a method that produces exactly one gallon of water, another method that produces exactly two gallons of water, another method that produces exactly three etc up to exactly eight gallons of water. you may fill jugs from the faucet or from one another. you may not rough estimates???
Penny Nom lui répond.
The volume of water in a sphere shaped water tower 2006-05-14
Dan pose la question :
I work in the water industry, providing automatic controls for water systems. I was wondering if there was a formula for calculating the volume of water in a sphere shaped water tower? With the use of a pressure gauge we know the elevation of zero water {the bottom of sphere) and the overflow elev. (near the top of sphere) I would like to calculate how many gallons are at any elevation in between.
Stephen La Rocque lui répond.
Small pipes and large pipes 2006-05-09
geece pose la question :
A large fresh water reservoir has two types of drainage system. Small pipes and large pipes. 6 large pipes, on their own, can drain the reservoir in 12 hours. 3 large pipes and 9 small pipes, at the same time, can drain the reservoir in 8 hours. How long will 5 small pipes, on their own, take to drain the reservoir?
Penny Nom lui répond.
How much does 1300cc of liquid weigh? 2006-04-28
Debra pose la question :
How much does 1300cc of liquid weigh, and how is the formula equated?
Stephen La Rocque lui répond.
The waterway between Lake Huron and Lake Superior 2006-03-21
Trenae pose la question :
the waterway between lake huron and lake superior separates the u.s and canada.it is usually 13 feet above the water when its closed and each section is 210 feet long if the angle of elevation is 70 degrees then what is the distance from the top of the drawbridge to the water and the width of the gap created by the 2 sections of the bridge
Penny Nom lui répond.
If an acre of land is covered with one inch of water 2005-12-27
Patti pose la question :
If an acre of land (43560 sq ft) is covered with one inch of water, how many gallons of water cover that acre.
Penny Nom lui répond.
Two water jugs 2004-08-16
A student pose la question :
You go to a source of water with two jugs and only two jugs. One jug has a capacity of exactly three pints and the other five pints. Both jugs are opaque (you can`t see inside them) and irregularly shaped. You have no other water containers. You do not have a scale. How can you use the two jugs and only the two jugs to measure exactly four pints of water?
Penny Nom lui répond.
Water in a pipe 2004-04-25
Marlean pose la question :
How much water would be in a 480 foot one inch inside diameter pipe?? In imperial gallons please. thanking you in advance for your help in this matter.
Penny Nom lui répond.
A water lily 2004-03-17
Inba pose la question :
A water lily with a rigid stem extends one foot above the surface of the water. When pulled over, it disappears beneath the water at a distance 3 feet from where the stem originally entered the water. How deep is the pond?
Penny Nom lui répond.
Three jugs 2004-02-26
Shelly pose la question :
You have three jugs: A 6 Liter, 4 Liter and a 3 Liter. Your goal is to get exactly 5 Liters of liquid in the 6 Liter jug. Your supply of liquid is unlimited and there are NO markings on the containers. You cannot do halves.
Claude Tardif lui répond.
A fish tank 2003-11-26
Bill pose la question :
How do I work out the volume and weight of water in a fish tank that is 36in x 14in x 12in?
Penny Nom lui répond.
Water in a tank 2003-09-02
A parent pose la question :
if a tank is 48 inches long 14 inches wide and 18 inches deep if a yardstick was inserted into the tank and measured 2 inches of water in the tank how many gallons of water would be in the tank.
Penny Nom lui répond.
Water in a cone 2003-08-12
Adrienne pose la question :

Water is poured into a tank in the shape of an inverted right circular cone.ð The height of the tank is 8 m and its radius at the top is 4 m.

a. Draw and label a picture to represent this situation.ð (I know how to do this)

b. Identify all variable quantities. (h = 8m, r = 4m)

c. Find an equation that relates the variable quantities, and reduce the number of variable quantities to two.

I was thinking about the equation V = 1/3 pi r2 h, which is the Volume of a cone, but I am stumped as to how I am supposed to "reduce the number of variable quantities to two." Can you point me in the right direction?


Penny Nom lui répond.
Two tanks of water 2002-11-08
A student pose la question :
A 2000 L tank containing 550 L of water is being filled with water at the rate of 75 L per minute from a full 1600 L tank. How long will it be before the two tanks have the same amount of water?
Penny Nom lui répond.
Two rate problems 2002-09-30
Rebecca pose la question :
  1. There are two small holes in the bottom of a tub filled with water. If opened, one hole will empty the tub in three hours; the other will empty it in six hours. If both holes are opened at the same time, how long will it take to empty the tub?

  2. An airplane flies 400 miles per hour in calm air. It can cover 900 miles flying with the wind in the same time that it can cover 700 miles against the wind. What is the speed of the wind?

Penny Nom lui répond.
Conversion of units 2002-04-29
Matt pose la question :
I am having trouble finding a workable equation for the following problem, particularly the conversion of two systems of measurement.

The question states that there are 27 grams of salt in a kilogram of seawater. And it asks how many tonnes (1 tonne = 1000 kilograms) of salt are there in one cubic kilometer of ocean. It also says that the density of seawater is 1.1 g/cm3.

What is the equation and how do I figure out how many kilograms there are in a cubic kilometre?


Harley Weston lui répond.
Water jars 2001-08-27
Pe3te pose la question :
Stacie and Kacie each have a jar. Stacies jar holds 5 quarts of water and Kacies jar holds 3 quarts. The girls dad ask them to go get him some water from the pump and to get him 1 gallon of water (NO MORE NO LESS) The jars were not marked in any way. In ten minutes the girls where back with 1 gallon. How did they get exactly 1 gallon ?

1) there are two ways to do it I only no one. 1st answer is.....


Penny Nom lui répond.
Connecting to a water line 2000-10-20
Vanja pose la question :
My question is...A house is to be connected to a new water main that runs along the line y=2/3x-1. The connection point at the house has coordinates (2,9), where the units represent metres. What lenght of plastic pipe is needed to connect to the water main at the closest point?
Penny Nom lui répond.
A trig question 2000-07-01
Will pose la question :
An open rectangular tank a units deep and b units wide holds water and is tilted so that the base BC makes an angle theta with the horizontal. When BC is returned to the horizontal, who that the depth of the water is

(a squared) * cot theta div 2b units


Harley Weston lui répond.
The weight of a watermelon 2000-04-25
Lori Speir pose la question :
If I have a 100 pound watermelon and it is 99% water. If it sits out in the sun all day and is now only 98% water what does it weigh now?
Penny Nom lui répond.
 
Page
1/1

 

 


Centrale des maths reçoit une aide financière de l’Université de Regina et de The Pacific Institute for the Mathematical Sciences.

CMS
.

 

accueil centre de ressources accueil Société mathématique du Canada l'Université de Regina PIMS