River Definition and 196 Threads

[SOLVED] Boat in the river problems Homework Statement (a.) A boat took 1 hour 50 minutes to go 55 miles downstream and 3 hours 40 minutes to return. Find the rate of the current. (b.) A boat travels 60 miles downstream in the same time it takes to go 36 miles upstream. The speed of...

Homework Statement A river of width D flows Northward with speed v. Show that the water is lower at the west bank than at the east bank by approximately 2Dwvsinlamda/g where w is the angular velocity of the Earth and lamda the latitude. Homework Equations The Attempt at a...

Homework Statement A river flows toward 90 degrees. A river boat pilot heads the boat at 297 degrees and is able to go straight across the river at 6 m/s. Homework Equations What is the velocity of the current? What is the velocity of the boat? The Attempt at a Solution I drew a...

i'm curious to know whether my method is the long way or perhaps, the only way in solving for initial velocity for this problem if you have a faster way, i'd like to see it ... I'm trying to be efficient! The take off ramp is inclined at 53.0, the river is 40.0m wide, and the far bank is...

In order to get across a river that's 300m wide at a distance 130m upstream, a boat must angle at 40degrees. The velocity of the boat in still water is 2.2m/s. What is the velocity of the river? Thanks for the help! AstroKat

Homework Statement This is a question I had in a mathematics quiz I participated in today. The river bank of a river on the west coast is under observation perfectly. Suppose the temperature variation for the last one hundred years is known absolutely. The temperature now is exactly as it...

A replica of a Revolution era submarine cited for safty violations.

Homework Statement Hello! I'm the foreigner so I'm sorry for my English if it won't be good. I have a big problem with one exercise. I think that I have to use Galilean Transformation but I don't know how to start. There is the content: A motorboat is flowing by the river upstream with the...

Homework Statement A swimmer who can swim at a speed of 0.80m/s in still water heads directly across a river 86m wide. The swimmer lands at a position on the far bank 54 m downstream from the starting point. Determine: (C) The direction of departure that would have taken the swimmer...

Wow! Amazing pictures! I shouldn't be surprised anymore by now since we have had outstanding pictures during all the contest, but they continue to be amazing. Well done everyone! Please vote for the picture that best represents our theme this week, which is a picture of a river. {Since...

Note that I have added an additional rule to our contest. This is posted in Item #4 in this list. Cry Me A River This week's theme is all about rivers of water. Your picture must have a river as its main subject. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant...

Homework Statement An air bubble of radius 2mm if formed at the bottom of a 3.3m deep river.Calculate radius of bubble as it comes to the surface. atmospheric pressure=10^5 pa and density of water=1000 kg/m^3

A 200-m-wide river has a uniform flow speed of 1.1 m/s through a jungle and towards the east. An expoere wishes to leave a small clearing on the south band and cross the river in a powerboat that moves at a constant speed of 4 m/s with respect to the water. There is a clearing on the north...

A 340-m-wide river has a uniform flow speed of 0.84 m/s through a jungle and toward the east. An explorer wishes to leave a small clearing on the south bank and cross the river in a powerboat that moves at a constant speed of 3.8 m/s with respect to the water. There is a clearing on the north...

A boat that can travel at 4.0 km/h in still water crosses a river with a current of 1.8 km/h. At what angle must the boat be pointed upstream to travel straight across the river? In other words, in what direction is the velocity of the boat relative to the water? I have already found the...

When you swim across a river does the time to reach the opposite shore depend on the rate of flow of the water? Defend your answer

Hi. This is a two part question, I'm pretty sure about the first bit but in the second part my answer seems a bit weird. Not the order of magnitude I was expecting. Just wondering can anyone confirm or deny my suspician? Point me in more correct direction if I am indeed wrong. This isn't for...

(1 pt) The Deligne Dam on the Cayley River is built so that the wall facing the water is shaped like the region above the curve y=0.7 x^2 and below the line y= 300. (Here, distances are measured in meters.) The water level is 38 meters below the top of the dam. Find the force (in Newtons)...

Maybe it's because of the awkward of this one that I'm not sure why it is what it is. I am looking at physics questions and answers but no work is shown. If someone could tell me how to set it up, I'd appreciate it: QUESTION: A river 1.00 mile wide flows with constant speed of 1.00...

This is the question I have from my book, I have tried numerous methods of solving it, but I cannot obtain the correct answers. If someone could get me started with an equation I could go from there... Jane, whose mass is 50kg, needs to swing across a river (having width D) filled with man...

A boat with a windmill rotating a water propeller can sail directly upwind. It has been done many times, so take that as a given. (The maximum speed so far is about 0.5 times the speed of the wind. For a land yacht, the maximum speed so far is about 1.0 times the speed of the wind.) My...

A little harder then the lion/goat/cabbage but easier (IMO) then the King/Queen/Peasant+wifes. A mother, a father, two sons, two daughters, a criminal and a cop need to cross a river. They have a boat for two, as usual in these situations. 1. The mother cannot be in the presense of any...

Assume a windmill boat is drifting down a fast flowing river during windless conditions. It uses its relative wind to outrun the speed of the river. What is the correct way to describe this situation in terms of energy and power? Can we say that its energy is derived from the river but its power...

Is it time we reviewed our agricultural practices and maybe our diet? http://www.nytimes.com/2005/08/15/nyregion/15dip.html?ex=1281758400&en=1257bf75761d7a84&ei=5090&partner=rssuserland&emc=rss

D = 9 + 3cos[pi(t)/14] where D meters is the depth of the water above the river bed at time t hours after 12 noon on 7 March 2005, Monday. This means that the depth of water only depends on time. a) Write down the minimum and maximum depths of the river b) Find the day and time when the water...

There are six people. They are: A king, A queen, A knight and his wife, A servent and his wife. There is one boat and they all want to cross the river. The problem is: the boat cannot take more than 2 people. Your job is to tell them a way so that they can all get across the river. Rules...

Now where have I heard about this before...? :rolleyes: http://www.katu.com/stories/78092.html

I have jury st in front of me I have banbury Rd to my right I have the river avon behind me.

Q. A child is in danger of drowning in the Merimac river. The Merimac river has a current of 3.1 km/hr to the east. The child is 0.6 km from the shore and 2.5 km upstream from the dock. A rescue boat with speed 24.8 km/hr (with respect to the water) sets off from the dock at the optimum angle to...

Q. A river 590 ft wide flows with a speed of 6 ft/s with respect to the earth. A woman swims with a speed of 3 ft/s with respect to the water. -------------------------------------------------------------------------------- a) If the woman heads directly across the river, how far downstream...

Woo. Nevermind the rest of this message. I figured it out =)))) Hello all :) Am having brain fart, I need help (obiviously) from the experts! All the tutorials and examples about the classic boat crossing a river aren't helping me with this problem. "A woman can row a boat at 6.3...

A swimmier heads across a river, swimming at 1.20m/s relative to still water. It arrives at a point 67.0 m downstream from the oint directly across the river, which is 100.m wide. What is the speed of the river current? Here's what I did: tan^-1(67/100) theta = 33.82 degrees Vx =...

here's the question...ill make it short a guy wants to leap a river. THe takeoff ramp is inclined at 53 degrees. The river is 40m wide, and the far bank where he is going to land is 15m below the top of the take off ramp. The river itself is 100 m below the ramp. Ignoring air resistence, find...

I know i need to use a simple vector diagram ...but I'm not sure how to set it up... In what direction should a boat point if it has a speed of 10 m/s, and wants to end up directly across a river with a current of 5 m/s. help? :confused: :bugeye: :rolleyes:

if jon rows a boat at 4m/s the river is moving at 6m/s and the river is 300m how long does it take to row across. I need the equation

A swimmer wants to cross a river, from point A to point B. The distance d_1 (from A to C) is 200 m, the distance d_2 (from C to B) is 1500 m, and the speed V_r of the current in the river is 5 km/h. Suppose that the swimmer makes an angle of 45 degrees(0.785 radians) with respect to the line...

A canoe has a velocity of 0.420 m/s southeast relative to the earth. The canoe is on a river that is flowing 0.550 m/s east relative to the earth. A.) Find the magnitude of the velocity of the canoe relative to the river. B.) Find the direction of the velocity of the canoe relative to...

Let me know if the following statement is wrong : If a boat is going to cross a river directly ( i.e perpendicularly ) the x, horizontal, component of the boat velocity must be cancelled, that's be equal, by the water stream vector. I followed this idea in a problem but my answer is not...

Okay, this may sound silly... but it's driving me crazy! Some time ago, my friend showed me an extra credit problem for her class and ever since I haven't been able to figure it out. Now classes are over and we've all moved home, but it's still bugging me to no end. So, if you can help... please...

In this glaciated upland region why is the the river or lake a green colour? Me thinks that it is obviously to do with the sediment on the bed of the lake. Perhaps it is a chalk bed or a solution lake?

You probably know about this guy. http://www.talonmarks.com/news/2003/11/19/Opinion/The-Life.Of.Garyridgeway-560355.shtml confessed to killing 48 women, which is a record for serial killings. The legendary Green River Killer. 48 innocent women (most were whores though). And he...

Hi all, I have the following problem which I have tried to solve for a very long time, very very long time indeed- 2 or more years. I am studying here all by myself and I got no one to help me. I shall not participate in any talk. I have had enough with it. this problem is in the Schaum's...

Hi everyone…it feels like it has been a while but I have another question? This is dealing with vectors. Q: A boater wants to cross a river that has a current of 5mph and measures .75 miles in width. If the boat can travel at 20mph through the water, what heading must it take in order to...

A river 570 ft wide flows with a speed of 6 ft/s with respect to the earth. A woman swims with a speed of 3 ft/s with respect to the water. a) If the woman heads directly across the river, how far downstream is she swept when she reaches the opposite bank? b) If she wants to be swept a...

1.Jack is strolling along the bank of a 1-km wide River when the most beautiful girl materialises on the shore directly opposite him. Fearing she will disappear before he has a chance to establish face-to-face communication, he quickly devises a plan to reach the opposite shore in the shortest...

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