Lake Definition and 106 Threads

Homework Statement A straight uniform stick of L= 1m and mass m = 1 KG lies on a surface of a frozen lake.Someone kicks the stick at one end,imparting an impulse of 2Ns normal to the stick.Describe the subsequent motion of the stick. Homework Equations I=mΔV The Attempt at a...

Homework Statement A fish directly beneath the surface of a lake sees a fly on a stick above the water. The fish sees the fly at an angle of 36 degrees above the horizontal from it's current position and it's exactly .9 meters from the fish. At what angle must the fish spit a drop of water...

Homework Statement There was a snowmobile accident on Ramsey Lake in Northern Ontario. A police officer arrives at the scene of the collision of the two snowmobiles to find both drivers unconscious. When the two vehicles collided, their skis became entangled and the two snowmobiles remained...

How do we fix this? The green scum shown in this image is the worst algae bloom Lake Erie has experienced in decades. Such blooms were common in the lake’s shallow western basin in the 1950s and 60s. Phosphorus from farms, sewage, and industry fertilized the waters so that huge algae...

Next week I'm packing up the family and heading for Laconia, NH. We'll be near, but not on the shore of Lake Winnipesaukee. Winnipesaukee is, of course, a Native American name reputed to mean either "The Smile of the Great Spirit", "Beautiful Water in a High Place", "Lakes Region", "Good Smooth...

Hi.. looks like simple problem but the result i got is unreasonable. Homework Statement There is lump of ice, that falling down into a lake that his temperature is 0 celsius degrees. K of the lump getting melt ( = M that melt/M ) What is the height that from him, the lump fell ...

Here at National Taiwan University, there is a beautiful lake called the Drunken Moon Lake which is basically right next to my office at Astro-Math Building. I have been observing a family of Common Moorhen for months. The first time I noticed them was probably back in March, when the pair had...

"Building an artificial lake" Howdy PF :smile: this is actually a Calc III project I'm working on with two others. We are in the beginning stage and are having a little trouble on how to exactly go about doing this problem... Homework Statement "A small man made lake is being proposed on...

Homework Statement The lake house is located in A, which is home of Mike. Against the shore, perpendicular to the 675 m distance is the island's beach house B, which is home of Tina. Mike walks along the beach at a speed of 6.9 km/h toward the sauna and the C arrives there exactly 10 minutes...

Glow in the dark lake in Australia I came across this just yet and it looks amazing :O So I wanted to share with you guys :P

Homework Statement What is the approximate decrease in pressure in going 31 m above the surface of the lake? Air at 20 degrees C has density of 1.2 kg/mcubed. The pressure at the surface of the lake is 104 kPa Homework Equations Pressure = F/Area Force = density*area*height*g...

Homework Statement The Variation of the density with depth h in a muddy lake is given by ρ=ρ0+kh, where ρ0= 1000kg/m^3 is the density at the surface and k=100kg/m^4 Calculate the gauge pressure at a depth of 10m.

Hi, This is my problem: Consider a lake of constant volume V containing at time t an amount Q(t) of pollutant, evenly distributed throughout the lake with a concentration c(t), where c(t) = Q(t)/V . Assume that water containing a concentration k of pollutant enters the lake at a rate r...

I am a fisheries biologist interested in manipulating a lake level by about six inches via a box cement outlet structure on a small lake. The outlet structure is currently governed by two adjacent 5ft by 0.5ft dam boards,which have historically been removed one at a time in the spring and...

http://www.cnn.com/video/#/video/us/2010/03/08/dnt.oh.ufo.sighting.wjw?iref=allsearch this is the correct link

Homework Statement A lead ball is dropped into a lake from a diving board 5.0 meters above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.0 seconds after it is released. How...

Homework Statement At the surface of a freshwater lake the pressure is 106 kPa. (a) What is the pressure increase in going 34.5 m below the surface? (b) What is the approximate pressure decrease in going 36 m above the surface? Air at 20°C has density of 1.2 kg/m3. Homework Equations...

Homework Statement At the surface of a freshwater lake the air pressure is 1 atm. At what depth under water in the lake is the water pressure 4.5 atm?Homework Equations P=a+hgp h=(P-a)/(g*p)The Attempt at a Solution h=(4.5x105 - 1x105)/(9.8*1000)=35.71 I also did the equation with 9,000 Pa...

Basically Lake Michigan is located in a relatively cold climate. Its around 494 km long and 190 km at its widest and with a depth of 281 meters... From what i understand about water freezing in lakes...4 C was probably the temperature at the bottom of the lake , also winter isn't long enough...

Hiya my question is Why is it impossible with a pump to suck water from a lake if you place the pump 15 meters above the water I think it has somthing to do with gravity but if anyone could explain it in detail that would be great Thanks :)

Say that one real fast three times! CBS did a report on this tonight. After it was noted that the spelling of the Lake's name had to be corrected on the town's sign, CBS pointed out that the police cars have it spelled out incorrectly on their doors, as well...

Homework Statement A 1.6 m long glass tube closed at one end is weighted and lowered to the bottom of a freshwater lake. When the tube is recovered, an indicator mark shows that water rose to within 0.32 m of the closed end. Assume the temperature is constant, the acceleration of gravity...

I'm searching a list of the largest lake in every European country. Of course, I can google them one by one, but it would be easier if there is a list somewhere on the internet. However, I can't find any...

Homework Statement the question is:the floats of 2 men fishing in a lake from boats is 21m apart.the waves causes both boats to bob up-down 20 times/minute.A third man observes that one of his colleagues is on the crest while other is on trough,and there is a one crest distance between...

Homework Statement a lead ball is dropped into a lake from a diving board 5.0m above the water. after entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. the ball reaches the bottom after 3s after it is released. how deep is...

Homework Statement A 2.1 m long glass tube that is closed at one end is weighted and lowered to the bottom of a freshwater lake. When the tube is recovered, an indicator mark shows that water rose to within 0.43 m of the closed end. Determine the depth of the lake. Assume constant temperature...

Homework Statement The figure below shows a worker poling a boat-a very efficient mode of transportation-across a shallow lake. He pushes parallel to the length of the light pole, exerting on the bottom of the lake a force of 245 N. Assume the pole lies in the vertical plane containing the...

Homework Statement While anchored in the middle of a lake, you count exactly three waves hitting your boat every 12.0 s. You raise anchor and start motoring slowly in the same direction the waves are going. When traveling at 1.50 m/s, you notice that exactly two waves are hitting the boat from...

Homework Statement A lead ball is dropped into a lake from a diving baord 5.0m above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.0 s after it released. How deep is the...

An ice cube of 10g -10°C is placed in a lake that is 15°C.Calcule the variation of entropy of the system when the ice cube to reach the thermal balance with the lake. The specific heat of the lake is 0,50cal/g°C.:biggrin:

Homework Statement An ice sheet forms on a lake. The air above the lake is at \Delta T (<0), while the water below the ice sheet is at 0°C. Assume that the heat of fusion of the water freezing on the lower surface is conducted through the sheet to the air above. How much time does it take to...

Hello, I harvest lake weeds and I'm looking for an easier way to remove the aquatic weeds from the water after they are cut. A couple of quick ideas were to use an older pontoon as a way to transport the weeds out of the lake. 1) Thought about some type of hydrolic lift table that could...

http://www.ananova.com/news/story/sm_2384990.html?menu=news.quirkies Ok, so there's this lake that allegedly disappeared extremely quickly. They showed it on the American television show 60 Minutes a few nights ago, and to me it actually looked like there was still a lake there, but I guess...

Could I build a boat that skims across the surface of a lake like a stone and only needs an injection of thrust from an engine now and again to keep it going? Perhaps such a boat would have a rotating outer part and a stationary inner part for passengers.

1. Depth of a lake is 1637m. If a beam of light with an angle of incidence of 60.0º enters the water from the air, what is the horizontal distance between the point where the light enters the water and the point where it strikes the lake's bottom? 2. Snell's Law: ni(sin Өi) = nr(sin Өr)...

At the surface of a freshwater lake the pressure is 106 kPa. (a) What is the pressure increase in going 35.1 m below the surface? (b) What is the approximate pressure decrease in going 34 m above the surface? Air at 20°C has density of 1.2 kg/m3. i was almost sure that i needed to use this...

If I skim a flat stone across a lake will it go further on a calm,flat,water surface or on a surface covered with waves i.e can the pebble pick up momentum from the waves if it travels at the right speed and trajectory?

Homework Statement Calculate the changes in total entropy of the universe as a result of the following processes: (a) A block of mass 6kg and heat capacity of 300 J/K/kg at 150oC is placed in a lake at 0oC. Homework Equations The Attempt at a Solution I think I have found the entropy change...

The pole in a lake! There is a pole in a lake. One-half of the pole is in the ground, another one-third of it is covered by water, and 12 ft is out of the water. What is the total length of the pole in 'ft'?:bugeye:

can somebody tell me how is the surface of a lake been frozen yet the water underneath the ice layer remains unfrozen? can someone give me detailed explanation of this. including the convection theory and density as well. i mean include whatever that is connected. thanks

a). Show that the thickness of the ice sheet formed on the surface of a lake is proportional to the square root of the time if the heat of fusion of the water freezing on the underside of the ice sheet is conducted through the sheet. b). Assuming that the upper surface of the ice sheet is at...

lake ball lightning ivan there's an anomaly in Argentina in a region called Victoria lake, i remember i saw in a tv program some ball lightining rising from the water and staying for a while, and the observers reporting weird experiences , as letargic, its has many antique reports, specially a...

I am working on my thermodynamics problems and I ran into a few problems on a couple of the questions: 1.) Lake Erie contains roughly 4.00*10^11 m^3 of water. (a) How much heat is required to raise the temperature of that volume of water from 11 degrees C to 12 degrees C? (b)...

Question A diver named Jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 {\rm atm}) to the surface (where the pressure is 1.00 {\rm atm}). The temperature at the bottom is 4.0{\rm ^{\circ} C}, and the temperature at the surface is 23.0{\rm...

A duck is floating on a lake with 28% of its volume beneath the water. What is the average density of the duck? This question seems pretty straight froward I realize ultimately that in order to find the answer the duck density= duck mass/duck V. If it is 28% I am assuming that should equal...

blue lake test...HELP aluminium ions presence in a salt is confirmed by performing a test called blue lake test i have been trying to get it rught in my chem lab for weeks but in vain can anyone suggest the exact method i should use the way i perform the test is that i take solution of...

A lead ball is dropped into a lake from a diving board 5.00 m above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 4.60 s after it is released. how deep is lake?

never heard of this happening before Lake vanishes overnight in Russia Last Updated Fri, 20 May 2005 23:05:05 EDT CBC News MOSCOW - Villagers in central Russia are mystified by the sudden disappearance, overnight, of the town's lake. Russia's NTV channel showed a muddy basin where...

This is a physical intuition problem I don't quite understand fully. The question is, why doesn't Lake Tahoe freeze (the whole Lake)? I know the crystal structure for water breaks at 4 C and the volume is at its lowest point at that temperature. If the temperature above the water is...

I have this question I have to do for my physics class... I have been thinking about it for an hour now, but can't figure it out. Any help would be greatly appreciated. here is the question: You find yourself in the middle of a frozen lake with a slippery surface so slippery (ms = 0, mk = 0)...