Sunday

April 20, 2014

April 20, 2014

Number of results: 28,701

**math**

a rectangular tank has the measurement 60cm wide and 2000cm2 water flows into the tank at the rate of 8 liters per minutes how long will it take to fill the tank?
*Monday, April 23, 2012 at 10:38am by john*

**maths**

a dam holds 13.5 megalitres of wate when full. If water flows from the dam at the rate of 5 litres per second, approximately how long will it take to empty the dam.
*Sunday, April 14, 2013 at 12:48am by senorita*

**physics**

why does an ideal fluid move faster through a pipe with decreasing diameter? a. the pressure within the fluid increases b. the pressure within the fluid decreases c. the pipe exerts more pressure on the fluid d. the fluid moves downhill
*Wednesday, February 18, 2009 at 4:58pm by y912f*

**physics**

A horizontal segment of pipe tapers from a cross sectional area of 50 cm2 to 0.5 cm2. The pressure at the larger end of the pipe is 1.26 105 Pa and the speed is 0.029 m/s. What is the pressure at the narrow end of the segment? Pa Please help!
*Monday, April 9, 2012 at 4:57pm by Malika*

**Social Studies**

what rivers drain kamloops lake as water flows in the ocean? my answers: thompson's river and fraser river... are my answers correct
*Thursday, September 8, 2011 at 6:43pm by Vidya*

**Math**

A manufacturer decides to build a half-pipe with a parabolic cross section modelled by the relation y=0.2x^2-1.6x+4.2, where x is the horizontal distance, in metres, from the platform, and y is the height, in metres, above the ground. Complete the square to find the depth of ...
*Sunday, November 25, 2012 at 1:05pm by Anonymous*

**Physics**

The "first resonant wavelength" is four times the (open) tube length. That is supposedly the "best" sound that the pipe makes. The pipe lengths therefore tell you the wavelengths. Divide the sound speed by the wavelength to get the frequencies. The equation for sound speed vs ...
*Wednesday, November 5, 2008 at 10:20pm by drwls*

**physics**

The range of human hearing is roughly from twenty hertz to twenty kilohertz. Based on these limits and a value of 350 m/s for the speed of sound, what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their fundamental frequencies) ...
*Saturday, April 28, 2007 at 2:34am by Cavin*

**Math**

I am having trouble understanding this problem. Please help. A customer wants to make a teepee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the teepee, and he wants the teepee to be 12 feet across and 8 feet tall (see ...
*Sunday, April 13, 2008 at 1:19pm by Anonymous*

**Physics_Vectors**

You can swim at a speed v relative to the water. You are swimming across a river which flows at a speed V relative to the shore. The river is straight and has a constant width. A. If you wish to swim directly across the river, in what direction should you swim relative to the ...
*Monday, May 21, 2012 at 8:54am by Sky_*

**Physics**

A constricted horizontal tube of radius r(1)=4.00 cm tapers to a tube of radius r(2)=2.50 cm. If water flows at speed 2.00 m/s in the larger tube, (a) find the speed of the water v(2) in the smaller tube. (b) Find the flow rate in this tube.
*Wednesday, April 24, 2013 at 11:48am by Lashawn*

**Pre Calc**

A swimming pool can be filled by a vent in 10 hours. When the pool is filled, it can be emptied bya drain pipe in 20 hours. The pool manager mistakenly leaves the drain pipe open while trying tofill the pool. How long will it take to fill the pool?
*Friday, January 21, 2011 at 10:28am by Emily*

**Science**

A patients drip bag is hung a high on a stand.The liguid flows into their blood to give them food or drugs.Explain why the bag is raised up using the words water pressure and weight.
*Saturday, April 12, 2008 at 9:48am by Lauren*

**physical**

find the resultant velocity of riverboat that steams 60 km/hr in still water , if travels upsteam against a river current that flows 5.0 km/hr
*Sunday, July 29, 2012 at 11:18pm by Anonymous*

**physical**

find the resultant velocity of riverboat that steams 60 km/hr in still water , if travels upsteam against a river current that flows 5.0 km/hr
*Sunday, July 29, 2012 at 11:18pm by Anonymous*

**physics**

why does an ideal fluid move faster through a pipe with decreasing diameter? a. the pressure within the fluid increases b. the pressure within the fluid decreases c. the pipe exerts more pressure on the fluid d. the fluid moves downhill C? the pressure in a fluid is related to...
*Wednesday, February 18, 2009 at 6:05pm by y912f to bobpursley*

**financial management**

Given below are the cash flows of a project. Find out the net present value of the project. Cost of capital is 18% and initial investment is Rs. 2,00,000. Year Cash Flows (lakhs) 1. 40 2. 45 3. 60 4. 60 5. 75
*Wednesday, January 9, 2013 at 1:55am by anita*

**Science**

What is more salty the gulf of mexico or the gulf of california? Why? You need to check this: Only one fresh water river flows into the GofCalifornia, but many flow into GofMexico. So...
*Wednesday, January 31, 2007 at 7:58pm by Regine*

**Physics**

A powerboat heads due northwest at 11 m/s relative to the water across a river that flows due north at 5.9 m/s. What is the velocity (both magnitude and direction) of the motorboat relative to the shore?
*Wednesday, October 6, 2010 at 2:19pm by Preston*

**Algebra**

A kayak moves at a rate of 10 mph in still water. If the river's current flows at a rate of 2 mph, how long does it take the boat to travel 24 miles upstream?
*Monday, February 6, 2012 at 10:50pm by Andy*

**Physics**

A powerboat heads due northwest at 11 m/s relative to the water across a river that flows due north at 5.4 m/s. What is the velocity (both magnitude and direction) of the motorboat relative to the shore?
*Monday, December 3, 2012 at 12:42pm by Noah*

**Physics**

A 300L water tank is 2.8m above the ground and constantly refills itself to always have 300L present. A pipe with a diameter of 12.5mm runs from it to the shower. Due to gravity, work out how many litres per minute are produced?
*Sunday, February 5, 2012 at 11:17pm by Em*

**physic**

Physicists claim that charge never flows through an ideal capacitor. Yet when an uncharged capacitor is first placed in series with a resistor and a battery, then current flows through the battery and the resistor. Explain how this is possible.
*Sunday, March 30, 2014 at 8:47pm by suleri*

**Physic II**

Physicists claim that charge never flows through an ideal capacitor. Yet when an uncharged capacitor is first placed in series with a resistor and a battery, then current flows through the battery and the resistor. Explain how this is possible.
*Thursday, March 13, 2014 at 10:59am by Vuline*

**economics**

how can I do this question on a TI83? . If the interest rate is 10% and cash flows are $1,000 at the end of year one and $2,000 at the end of year two, then the present value of these cash flows is
*Sunday, May 26, 2013 at 4:48pm by dino*

**Physics**

In both cases the temperatures will be close to 0°C. Whenever you have water and ice in thermal equilibrium, the temperature will be 0°C. When you put a big piece of ice in water at room temperature, then the ice will at first melt fast, but this costs a lot of heat, and the ...
*Tuesday, May 29, 2012 at 9:21pm by Count Iblis*

**PHYSICS**

A dolphin wants to swim directly back to its home bay, which is 0.85 km due west. It can swim at a speed of 4.35 m/s relative to the water, but a uniform water current flows with speed 2.82 m/s in the southeast direction. (a) What direction should the dolphin head??? (b) How ...
*Tuesday, January 31, 2012 at 7:14pm by Anonymous*

**Physics**

A dolphin wants to swim directly back to its home bay, which is 0.85 km due west. It can swim at a speed of 4.30 m/s relative to the water, but a uniform water current flows with speed 2.83 m/s in the southeast direction. (a) What direction should the dolphin head? (b) How ...
*Thursday, September 13, 2012 at 7:21pm by Christina*

**Engineering**

Compute the average velocity of the water flowing in the pipe. Get this from the relation Q = A * V where Q is the volume flow rate and A is the cross sectional area. I recommend that you convert Q from gallons/min to ft^3/min, to get a flow velocity in ft/s. The time it takes...
*Monday, September 19, 2011 at 9:37pm by drwls*

**Math Help Please**

Let the pipe go from R (refinary) to P over a distance of 6-x km. The distance (under water) from P to S (storage) is therefore √(x²+2²). The total cost, C C = C1(6-x) + C2 (√(x²+2²)) where C1=cost on land C2 = cost under water, /km ...
*Thursday, October 28, 2010 at 1:17pm by MathMate*

**Physics**

LAST QUESTION: The seventh harmonic of a one end closed pipe organ has a frequency of 732 Hz, on a day when the temperature is 10 degrees Celsius. How long is the pipe? How long would it be for 732 to be the first harmonic? I used the same method for this problem - I just ...
*Tuesday, February 3, 2009 at 10:13pm by Harmonic*

**PHYSICS**

A dolphin wants to swim directly back to its home bay, which is 0.85 km due west. It can swim at a speed of 4.35 m/s relative to the water, but a uniform water current flows with speed 2.82 m/s in the southeast direction. (a) What direction should the dolphin head??? (b) How ...
*Monday, January 30, 2012 at 1:05am by Anonymous*

**physics**

when inflated, a rubber lifeboat takes the form of rectangular box of dimensions 2mx1.5x40cm. with out any load, it floats. how many 60kg people can it carry before water flows into it? assume that the density of seawater is 1025g/cubic meter.
*Thursday, March 7, 2013 at 1:03am by pretty*

**Physics**

#1.) A wind turbine has a Cp of 0.42 and extracts 50 kW of power when the wind velocity is 25 m/sec. How long are the blades? (ρ = 1.2 kg/m3) #2.) An electric hot water heater is used to heat 30 gallons of water from 20 °C to 45 °C. a. What heat energy is required to ...
*Sunday, December 5, 2010 at 6:33pm by Ricky*

**Physics**

a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the laboratory bench. The radius throughout the tube is 1.60 cm. Water is gradually poured into the open end of the left arm until the water begins to flow ...
*Thursday, November 4, 2010 at 9:46am by Ross*

**physics**

a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the laboratory bench. The radius throughout the tube is 1.60 cm. Water is gradually poured into the open end of the left arm until the water begins to flow ...
*Thursday, November 4, 2010 at 9:46am by Ross*

**PHYSICS!!!**

A liquid (ñ = 1.65 g/cm3) flows through a horizontal pipe of varying cross section as in the figure below. In the first section, the cross-sectional area is 10.0 cm2, the flow speed is 288 cm/s, and the pressure is 1.20 105 Pa. In the second section, the cross-sectional area ...
*Sunday, November 11, 2012 at 5:33pm by k*

**Geography Report (Ms. Sue)**

Chicago was built on a swamp that was drained. It still has a high water table and low areas like underpasses flood when it rains very much. The city makes great use of its beaches and parks along the lake. Probably the most amazing human-environmental interaction in the city ...
*Sunday, October 20, 2013 at 8:38pm by Ms. Sue*

**Physics**

a powerboat heads due northwest at 15 m/s relative to the water across a river that flows due north at 4.8m/s what is the velocity of the motorboat and angle due west of north
*Tuesday, December 18, 2012 at 7:13pm by Baaiz*

**Inorganic chemistry**

One kind of battery used in watches contains mercury(II) oxide. As current flows, the mercury oxide is reduced to mercury. HgO(s) + H2O(l) + 2e^- ==> Hg(l) + 2 OH^-(aq) If 2.5 x 10^-5 amperes flows continuously for 1095 days, what mass of Hg(l) is produced?
*Saturday, April 11, 2009 at 10:31pm by Steve*

**Algebra**

b)The water line is given by the equation y=-2/3x-12 Suppose you want to put a pink flamingo lawn ornament in your backyard, but you want to avoid placing it directly over the water line, in case you need to excavate the line for repairs in the future. Could you place it at ...
*Thursday, June 26, 2008 at 9:02pm by Mandy*

**SCIENCE!!**

1. The usual examples are computer/electronic systems, but you could choose a home heating system. A home heating system could comprise, radiators, pipe work, boiler (water heater, control system, pump. These are all interconnected. The control system (usually a timer plus ...
*Sunday, February 8, 2009 at 11:34pm by Dr Russ*

**Physics**

Electric charge flows through a wire, which naturally has a cylindrical cross section. Suppose the charge has a current density given by J = A/r, where A is a constant and r is the distance to the wire's central axis. How much current flows through the wire if its radius is R?
*Monday, March 18, 2013 at 3:26am by Lindsey*

**Maths**

think about it. each second, a 30cm tall cylinder of water passes through the pipe v = base * height 15cm^2 * 30 cm/s = 450 cm^3/s * 60s/min = 27000 cm^3/min = 27L/min
*Wednesday, January 11, 2012 at 11:25pm by Steve*

**Physics**

I have to plot a graph of Pressure gradient vs average velocity (water in a pipe, I have all the data). I plan to put the average velocity on the x axis, since I could control that better in an experiment. Do you agree/ Thanks. Charlie
*Monday, August 10, 2009 at 10:19am by Charlie*

**pysics**

A river is one mile wide and the water flows at the rate 3 miles/hour. If you can paddle a canoe 5 miles/hour in still water, then how long will it take you to paddle across the river and back? How long would it take you to travel one mile upstream (measured along the bank) ...
*Thursday, January 26, 2012 at 2:33am by christine*

**Math**

It takes pipe A 14 days to fill the fish pond. It takes pipe B 18 days to fill the same pond. Find out how pond it takes both pipes working together to fill the pond
*Monday, May 20, 2013 at 2:46am by Erika*

**Physics**

Flows to the Earth ΔS(E)=1000/290 =3.448 J/K Flows out of the Sun ΔS(S)=-1000/5700 =- 0.1754J/K ΔS= ΔS(E)+ ΔS(S)= 3.448-0.1754=3.2726 J/K
*Monday, November 19, 2012 at 12:18pm by Elena*

**language**

Thank you for using the Jiskha Homework Help Forum. There are MANY words for water actually! mizu, yes but clear water = kireina mizu; citty water = siudo; cold water = tsumetai; , ohiya; drinking water = nomi mizu fresh water = atarashii mizu; hot water = oyu; ice water = ...
*Friday, August 24, 2007 at 3:52am by SraJMcGin*

**physics**

C = e A/d here A = pi r^2 = pi(.12)^2 and d = .002 where e is the permittivity of the material between the plates in a vacuum or approximately in air e = ε0 = 8.8541878176.. × 10−12 however in water the e might be about 80 times as high and therefore the C would be ...
*Sunday, November 10, 2013 at 2:47pm by Damon*

**Geometry**

You are boating and heading directly west. The speed of the boat in still water is 36 mi/h. The river flows directly north at 15 mi/h. What is your resultant speed and directional?
*Monday, February 28, 2011 at 7:44pm by James*

**physics**

A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of the same material but of twice the radius,what is the new mean drift velocity (a)v/4(b)v/2(c)2v(d)4v
*Sunday, September 22, 2013 at 10:09am by physics*

**Science**

1. How does groundwater cause erosion and deposition? a. When acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves. *** ____________________ I agree if the question is about formation of caves. That is not what the question says ...
*Monday, March 3, 2014 at 2:46pm by Damon*

**AP Chemistry**

Water is being electrolysed in the presence of a non-reactive electrolyte under standard conditions. If 2.5 amperes of current flows through the circuit for 13.6 minutes at 25 degrees celsius and 1 atmosphere, what volume of hydrogen gas is produced? Please, I need help with ...
*Saturday, January 26, 2013 at 2:58pm by Toni*

**physics**

A cubical piece of heat-shield-tile from the space shuttle measures 0.18 m on a side and has a thermal conductivity of 0.065 J/(s·m·C°). The outer surface of the tile is heated to a temperature of 1050°C, while the inner surface is maintained at a temperature of 22°C. (a) How ...
*Monday, May 21, 2012 at 5:52am by robert*

**Math**

The mad river flows at a rate of 2 KM/H. In order for a boat to travel 79.2 KM of River and then return in a total of eight hours how fast must about travel in Still water?
*Tuesday, April 15, 2014 at 6:46pm by Anthony*

**Investing **

In a statement of cash flows, the cash flows from investing activities section should report a.the issuance of common stock in exchange for a factory building. b.stock dividends received. c.a major repair to machinery charged to accumulated depreciation. d.the assignment of ...
*Sunday, November 1, 2009 at 2:28am by Judy*

**probability April-004**

In a random sample of 95 sections of pipe in a chemical plant, 16 showed signs of serious corrosion. Construct a 98% confidence interval for the true proportion of pipe sections showing signs of serious corrosion, using the large sample confidence interval formula.
*Thursday, April 18, 2013 at 11:19am by probability*

**math**

You are asked to design a piping system that will connect a drilling rig 12 miles offshore to refinery on shore 20 miles down the coast. What values of x and y will give the least expensive connection if underwater pipe (x-section) costs $50.000 per mile and land-based pipe (y...
*Saturday, August 11, 2012 at 11:13pm by ibranian*

**Calculus**

You have a conical tank, vertex down, which is 12 feet across the top and 18 feet deep. If water flows in at a rate of 9 cubic feet per minute, find the exact rate of change when the water is 6 feet deep. You know the rate of dV/dt (inflow), and you can get the volume of a ...
*Wednesday, April 4, 2007 at 9:43pm by Tezuka*

**English**

1. Join one section of the pipe to the next. 2. Join one section of pipe to the next. (Do we have to use 'the' or not? Which one is correct?)
*Saturday, April 24, 2010 at 1:07am by rfvv*

**hydraulics**

P = Po + (rho)*g*d The water density, rho, has to be in mass units (slugs/volume), not pounds/volume rho = 62.4 lb/ft^3/g = 1.938 slug/ft^3 d = 100 ft is the water column height Po = 14.7 lb/in^2 = 2117 lb/ft^2 is the atmospheric pressure above. P = 2117 + (1.938)*(32.2)(100...
*Wednesday, January 11, 2012 at 11:08pm by drwls*

**math**

a bathtub can be filled by the hot and cold water pipes in four minutes and, when full, can be emptied by the waste pipe in five minutes. If it is half full and all three pipes are set running, when will the tub be filled?
*Thursday, October 25, 2007 at 8:51pm by Charlie*

**Math**

a bathtub can be filled by the hot and cold water pipes in four minutes and, when full, can be emptied by the waste pipe in five minutes. If it is half full and all three pipes are set running, when will the tub be filled?
*Wednesday, March 4, 2009 at 7:55pm by Evan*

**physics **

A man swims across the river with a velocity of 2 m/s relative to the flow of water. If the river flows steadily at 4 m/s toward south, what is the velocity of the man with respect to the shore? Solve for both the magnitude and the direction (in degrees).
*Saturday, October 30, 2010 at 9:27pm by HASANNY *

**Finance/571**

Trigen Corp. management will invest cash flows of $1,206,765, $1,085,603, $602,301, $818,400, $1,239,644, and $1,617,848 in research and development over the next six years. If the appropriate interest rate is 9.14 percent, what is the future value of these investment cash ...
*Monday, September 30, 2013 at 3:49pm by Anonymous*

**Intermediate algebra**

The current in a typical mississippi river shipping route flows at a rate of 4mph. In order for a barge to travel 24mi upriver and then return in a total of 5hr, aproximately how fast must the barge be able to travel in still water?
*Friday, November 11, 2011 at 11:38pm by pamela*

**Physics**

You have a boat that is capable of moving at 14.5 m/s through still water. You wish to cross a river that flows due north at 5.3 m/s. At what numerical compass heading must you pilot your boat so that you will reach a destination that is due west of your current position?
*Saturday, October 27, 2012 at 2:32am by Anonymous*

**physics**

Water flows through a horizontal tube of diameter 2.7 cm that is joined to a second horizontal tube of diameter 1.9 cm. The pressure difference between the tubes is 7.6 kPa. Find the speed of flow in the first tube. v_1 = ? m/s I've tried using P_1 + .5 * density * v_1^2 = P_2...
*Thursday, December 8, 2011 at 1:24pm by Trent*

**physics**

Use the Bernoulli equation to get the velocity of the water leaving the hole. There is 0.19 m of water above the hole. The water pressure there is (rho)*g*h above ambient pressure, which is 1000 kg/m^3*9.81m/s^2*0.19 = 1864 N (rho is the density of water) The water flows ...
*Thursday, January 14, 2010 at 11:03pm by drwls*

**physics**

1. Air flowing through a vent pipe of cross-sectional area 21[m^2] is traveling 0.89[ms^-1]. What is the flowrate? [18.7 m3s-1] Answer with three significant figures (don't forget to round!) or N/A if there is not enough information to answer the question. 2. Before the vent ...
*Friday, March 22, 2013 at 2:55pm by Sean*

**Math**

y=0.2x^2-1.6x+4.2 = 0.2(x^2 - 8x ) + 4.2 = 0.2(x^2 - 8x + 16 - 16) + 4.2 = 0.2( (x-4)^2 - 16) + 4.2 = 0.2(x-4)^2 - 3.2 + 4.2 = 0.2(x-4)^2 + 1 which is what you got, so you are correct up to that point Now, the vertex of the parabola is (4,1) which is 1 m above ground. But the ...
*Sunday, November 25, 2012 at 1:05pm by Reiny*

**Physics**

The water level in a vertical glass tube 1.40 m long can be adjusted to any position in the tube. A tuning fork vibrating at 440 Hz is held just over the open top end of the tube, to set up a standing wave of sound in the air-filled top portion of the tube. (That air-filled ...
*Wednesday, May 25, 2011 at 2:44pm by Emma*

**Physics**

A person can row a boat at a rate of 25 m/s in still water. The person heads the boat directly across a stream that flows at a rate of 9 m/s. Find the resultant velocity of the boat.
*Monday, January 11, 2010 at 8:48pm by Iman*

**Corporate Finance**

1. The Federal Reserve recently shifted its monetary policy, causing Lasik Vision's WACC to change. Lasik had recently analyzed the project whose cash flows are shown below. However, the CFO wants to reconsider this and all other proposed projects in view of the Fed action. ...
*Monday, March 1, 2010 at 1:21pm by Andy*

**math**

A kayak moves 10 miles per hour in still water. If the river current flows at 5 miles per hour, how long does it take reach 26 miles upstream?
*Wednesday, February 1, 2012 at 1:34am by Jmare*

**Science**

Phoenix and Athens are at similar latitudes (about 35 N and 38 N, respectively) so their temperatures are similar. However, Philadelphia is about 40 N and London is at 52 N. The U.K. has warmer temperatures because of the Gulf Stream that flows into the North Atlantic Drift ...
*Wednesday, December 12, 2007 at 4:58pm by Ms. Sue*

**chemistry**

tell the taste of these types of water well water mineral water fresh water tap water earated water?
*Saturday, May 14, 2011 at 4:06pm by saim*

**Science**

If I take a 1 liter water bottle filled with water, what will most likely happen to the water and why? A.The water will get warmer B.The water will get cooler C.The water will stay the same D.None of the above I've tried this and I think it's A;if so why? Thanks -MC
*Monday, December 15, 2008 at 5:46pm by mysterychicken*

**Math**

A customer wants to make a tee-pee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the tee-pee, and he wants the teepee to be 12 feet across and 8 feet tall. The customer needs to figure out the length of the sides of the ...
*Wednesday, July 21, 2010 at 2:27pm by Lynn*

**physics**

water .04 m deep. volume = .04*.36 = .0144 m^3 bottom of sink to pail height difference is .85-.45 = .4 m We will have to assume no friction in the pipe or entrance or exit losses unless you know those . Thefore use bernoulli p + rho g * change in h + (1/2) rho v ^2 = constant...
*Thursday, May 21, 2009 at 9:17pm by Damon*

**physics**

Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
*Tuesday, October 5, 2010 at 9:23am by Kim*

**PHYSICS ---HELP!**

Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
*Wednesday, October 6, 2010 at 11:16am by Leila*

**Physics**

Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
*Wednesday, October 6, 2010 at 1:24pm by Rick*

**Math (Re-post)**

A customer wants to make a tee-pee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the tee-pee, and he wants the teepee to be 12 feet across and 8 feet tall. The customer needs to figure out the length of the sides of the ...
*Wednesday, July 21, 2010 at 2:27pm by Lynn*

**physics**

when a transparent vessel is is filled with water and a jet flows out of the vessel with a light source placed so that a horizontal beam enters the liquid jet. Under what conditions does the jet operate like a light candle?
*Monday, April 12, 2010 at 12:20pm by alliyu*

**physics**

Water flows through a horizontal tube of diameter 2.6cm that is joined to a second horizontal tube of diameter 1.7cm . The pressure difference between the tubes is 8.0kPa.Find the speed of flow in the first tube.
*Sunday, January 30, 2011 at 4:27pm by Sid*

**physics**

Water flows through a horizontal tube of diameter 2.9cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa. A)Find the speed of flow in the first tube.
*Sunday, December 4, 2011 at 6:35pm by jazz*

**Physics**

A hunter wishes to cross a river that is 1.6 km wide and that flows with a speed of 4.8 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?
*Thursday, January 19, 2012 at 8:01pm by Emily*

**physics**

A hunter wishes to cross a river that is 2.5 km wide and that flows with a speed of 6.0 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.8 km/h with respect to the water. What is the minimum time necessary for crossing?
*Thursday, December 13, 2012 at 8:08pm by Anonymous*

**physics/ math**

Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
*Tuesday, October 5, 2010 at 11:05am by josh*

**Physics**

Water flows (velocity initial=0) over a dam at the rate of 660 kg/s and falls vertically 81 m before striking the turbine blades. Calculate the rate at which mechanical energy is transfered to the turbine blades, assuming 55% efficiency.
*Friday, October 8, 2010 at 8:59am by Jack*

**chemistry**

Tongue touches a pipe . Calculate final temperature of the tongue. 500 g of aluminum. ambient temp is -5 degrees Celsius. tongue is 100 g. heat capacity is same as pure water. assume heat capacity of aluminum is 24 J/molK.
*Sunday, February 1, 2009 at 5:13pm by kat*

**Physics**

An uncharged capacitor is connected to the terminals of a 3.0 V battery, and 9.0 uC flows to the positive plate. The 3.0 V battery is then disconnected and replaced with a 8.0 V battery, with the positive and negative terminals connected in the same manner as before. How much ...
*Wednesday, March 3, 2010 at 3:29am by JOTHEY*

**physics **

A hunter wishes to cross a river that is 2.0 km wide and that flows with a speed of 5.1 km/h. The hunter uses a small powerboat that moves at a maximum speed of 12.3 km/h with respect to the water. What is the minimum time necessary for crossing?
*Monday, December 17, 2012 at 9:10pm by Anonymous*

**physics**

A river flows due east at 2.00 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.0 m/s due north relative to the water.
*Thursday, September 13, 2012 at 4:12pm by Dan*

**physics**

A river flows due east at 1.34 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.3 m/s due north relative to the water.
*Monday, December 17, 2012 at 7:31pm by Anonymous*

**Finance**

A U.S.-based firm is planning to make an investment in Europe. The firm estimates that the project will generate cash flows of 200,000 euros after one year. If the one-year forward exchange rate is $1.40/euro and the dollar cost of capital is 9%, what is the present value (PV...
*Monday, December 13, 2010 at 9:26am by KEVIN*

**physics**

A hunter wishes to cross a river that is 1.1 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 9 km/h with respect to the water. What is the minimum time necessary for crossing?
*Monday, October 18, 2010 at 8:11am by john*

**physics**

A hunter wishes to cross a river that is 1.1 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 9 km/h with respect to the water. What is the minimum time necessary for crossing?
*Monday, October 18, 2010 at 8:11am by john*

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