Boat Definition and 366 Threads

What limits the speed of a sail boat? Give a sail boat that, for whatever reason, doesn't heal and dump wind, what would limit it's speed? For the sail, the lift and drag are proportional the the square of the velocity. The same goes for the keel. So as the force of drag increases with...

Ok so I'm in a Physics class and there is going to be a Cardboard Boat Race competition. So I have to build a boat out of cardboard for two people to fit in and it be able to float across a length's pool. I just want to know how you would find out if a boat that I build out of cardboard would...

Homework Statement The bottom of a steel "boat" is a 7.00 m x 8.00 m x 5.00 cm piece of steel (rho-steel=7900 kg/m^3.) The sides are made of 0.540 cm-thick steel. What minimum height must the sides have for this boat to float in perfectly calm water The Attempt at a Solution I...

Homework Statement A dog weighing 10.8 lb, is standing on a flatboat so that he is 21.4 ft from shore. He walks 8.5 ft on the boat toward shore and then halts. The boat weighs 46.4 lb, and one can assume there is no friction between it and the water. How far is he from shore at the end of...

Homework Statement You are finding it a challenge to climb from one boat up onto a higher boat in heavy waves. If the climb varies from 2.1 m to 4.5m , what is the amplitude of the wave? Assume the centers of the two boats are a half wavelength apart. Homework Equations just used...

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 A boat is moving to the right with a constant deceleration of .3 m/s^2 when a boy standing on the deck D throws a ball with an initial velocity relative to the deck which is vertical. the ball rises to a maximum height of 8 m above the release point and the boy must step...

Homework Statement You begin by measuring one of the hemispheres, finding that it has a mass of 21 g and a diameter of 8.6 cm Basically you have a hemisphere shaped boat with mass 21g and diamter 8.6cm you have to find the heaviest mass of rock that u can put in the boat that won't sink it...

Homework Statement I would really appreciate if someone could check my work for this poblem b.c i seem to be getting the wrong answer. Problem: A boat moves through a river at 6.1 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 2.4...

Homework Statement a boat is a drift in a stream that flows at 3 mph 40* north of east. A wind blowing at 11 mph from a direction 50*NW also moves the boat. What will be the net direction and speed of the boat? Homework Equations Vwa = 3mph 40* NE Vwi = 11mph 50* NW The Attempt at...

A fishing boat with a max. velocity of 2m/s is in a river that is flowing at 2m/s west. a. what is the maximum velocity the boat can obtain? is it 4m/s? b. what is the minimum speed? this question i need help answering...

Homework Statement A river flows due North at 3.17 m/s. A boat crosses the river from the West shore to the East shore by maintaining a constant velocity of 8.5 m/s due East relative to the water. If the river is 163 m wide, how far downstream is the boat when it reaches the East shore...

Homework Statement A boat leaves San Pedro and travels 35 km 15* west of south before its engine dies. You left San Pedro earlier in the morning and have traveled 42 km 23* south of west by the time the first boat's distress all reaches you. How far from and in what direction is the first boat...

Homework Statement (1) A River flows due east at 1.20 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 9.0 m/s due north relative to the water. I got the velocity of the boat relative to shore at 9.08 m/s at 82.406 degrees north of...

Can a wind propelled ice boat have a speed higher than the speed of the wind it is propelled by?? The answer, as i have come to know is "yes" ... but i need a proper explanation... hope that someone can help me out ! thanks in advance!

Homework Statement A boat is hauling a 250kg skier at an angle of 30 degrees below the horizontal with a force of 200 N. How much is the boat accelerating? Homework Equations F=ma The Attempt at a Solution I am using the F=ma equation. My only question is how does the 30...

Homework Statement A boat takes 2.0 hr to travel 31 km down a river, then 6.0 hr to return. How fast is the river flowing? Homework Equations r=d/t The Attempt at a Solution first started out by finding the rate the boat traveled in each trip. 31/2=15.5 km/hr 31/6=5.2...

1.Speedboat A speedboat with a length of 10.2m and a mass of 247 kg is negotiaging a circular turn (radius = 33 m) around a buoy. During the turn, the engine causes a net tangential force of magnitude 521 N to be applied to the boat. The intial speed of the boat going into the turn is 4 m/sec...

Homework Statement How do I calculate the propulsive force produced by a speaker? The Attempt at a Solution According to the wikipedia page on sound (http://en.wikipedia.org/wiki/Sound) a jackhammer 1m distant will generate 2 Pa of pressure. A Pascal is 1 N/m^2. So, a speaker that...

Homework Statement 2. A boat heads 15° west of north witha water speed of 3m/s. Determine its velocity relative to the ground when there is a 2m/s current from 40° east of north. Homework Equations cosine law The Attempt at a Solution I found the angle between the two...

My physics teacher gave us kind of a cool end of the year project: To construct a boat made entirely out of newspaper, masking tape, and shellack (I think this is the proper spelling). The boat will then have to go from end to end in a pool and the first person who does so wins. My idea is...

[SOLVED] Light propelled toy boat? Hi, I was wondering if it would be possible to to produce an LED propelled model boat - no practical application, just a toy. I think it would be possible to make a boat using something on the order of 3 high-power LEDs, with a small lithium based...

Homework Statement While on a visit to Minnesota, you sign up to take an excursion around one of the larger lakes. When you go to the dock where the 1500-kg boat is tied, you find that the boat is bobbing up and down in the waves, executing simple harmonic motion with amplitude 20cm. The boat...

Homework Statement A sailboat is traveling east at 5m/s. A sudden gust of wind gives the boat an acceleration 0.8m/s^2 (40 degrees north of east). 1. What is the boat's speed 6 seconds later when the gust subsides? 2. What is the boat's direction 6 seconds later when the gust subsides...

Homework Statement A spotlight on a boat is y = 2.5 m above the water, and the light strikes the water at a point that is x = 9.5 m horizontally displaced from the spotlight (see the drawing). The depth of the water is 4.0 m. Determine the distance d, which locates the point where the light...

[SOLVED] Man on a boat (Classical momentum problem) Homework Statement This problem is from Gregory: A boat of mass M is at rest in still water and a man of mass m is sitting at the bow. The man stands up, walks to the stern of the boat and then sits down again. If the water offers a...

[SOLVED] Buoyant force on a steel boat The bottom of a steel "boat" is a 7.00 m \times 10.0 m \times 4.00 cm piece of steel ( \rho _{{\rm steel}}=7900\;{\rm kg}/{\rm m}^{3}). The sides are made of 0.550 cm-thick steel. What minimum height must the sides have for this boat to float in...

[SOLVED] Bouyant force 1. A ferry boat is 4.0 m wide and 6.0 m long. When a truck pulls onto it, the boat sinks 4.00 cm (0.04 m) in the water. What is the weight of the truck? 2. F(sub: B) = F(sub: g)[displaced fluid] = m(sub: f)g (magnitude of bouyant force = weight of the fluid...

Homework Statement In his rowboat, Pierre heads directly across a river at a speed of 10 km/h. The river is 120m wide and is flowing at 6 km/h. Suppose Pierre wants to row directly across the river. At what angle relative to the shore should he head? I would really appreciate help with...

[SOLVED] How far downstream has the boat moved? I can't figure out the last part of this question. It's probably very simple and I'm just over looking it. The answers in part A are right. I just don't know how to get part B. A river flows due east at 1.80 m/s. A boat crosses the river from...

i just want to ask..is it possible to make a paper boat where in 3 people can sit there and withstand the effect of water, wind etc? because we have to do it and the only material would be paper (of course maybe glue tape etc)..thanks!

[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...

1. A child in a boat throws a 6.40-kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.0 kg, and that of the boat is 45.0 kg. Ignore water resistance. Should I use...

Homework Statement The drawing shows a boat being pulled by two locomotives through a canal of length 5.00 km. The tension in each cable is 6.00 103 N, and = 16.0°. What is the net work done on the boat by the two locomotives? Homework Equations The Attempt at a Solution

Homework Statement A 40 kg child and her 75 kg father simultaneously dive from a 100 kg boat that is initially motionless. The child dives horizontally toward the east with a speed of 2m/s, and the father dives toward the south with a speed of 1.5m/s at an angle of 37degrees above the...

Homework Statement A wave traveling in a straight line on a ocean is described by the equation y ( x,t) = (3.75cm)cos(.450cm^-1x + 5.40s^-1t) where y is the displacement perpendicular to the undisturbed surface of the ocean. How much time does it take for one complete wave pattern...

I am seeking a general answer relative to boat speed and psi effect on a transducer. I understand many variables affect this, ie, salinity, current, etc. Assuming a transducer mounted on the back of a boat hangs below into the water 1/4", water forces increase against this object as boat speed...

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...

Homework Statement 1. A river that is 209 m wide flows due east at a uniform speed of 2.2 m/s. A boat with a speed of 8.3 m/s relative to the water leaves the south bank pointed in a direction 30° west of north. (a) What is the magnitude of the boat's velocity? (m/s) (b) What is the...

if i tell you that water displaced in terms of (Volume initial and Vfinal ) is Vf how would i be able (if you can) to calculate the weight of the boat?

1. A boat, whose speed in still water is 2.20m/s, must cross a 260m wide river and arrive at a point 110m upstream from where it starts. To do so, the pilot must head the boat at a 45 degree upstream angle. What's the speed of the river's current? 2. How do you incoporate 45 degrees into the...

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

Can you please help me out with the second part of this question? I got the first two parts. Its PART C that I am not getting. Thanks! A boat of mass 250 kg is coasting, with its engine in neutral, through the water at speed 3.00 m/s when it starts to rain. The rain is falling vertically, and...

A small but amazing set of pictures for this contest. Please vote for the picture that best represents our theme, which are on boats and other floating vessels. 1. dontdisturbmycircles http://img120.imageshack.us/img120/9024/p1000654jx5.jpg 2. siddharth 3. ZapperZ 4. George...

Due to popular demand, our PF Photo Contest is BACK starting this week. All the rules are the same as before. Rock The Boat The theme this week involves boats and other floating vessels. It includes ocean liners, powerboats, sailboats, kayaks, barges, and dinghies. What are not included...

Here's the problem, attached to the post. I've tried using matrices to solve it but I'm not sure if the answers I am getting are correct. The professor hinted that the answers should be whole numbers, but I keep getting decimals. Any help?? I've uploaded a scan of my work, scan02 is where I...

Hello, Could somebody please give me clues as to how to do this problem? A ship cruises forward at vs = 4 relative to the water. On deck, a man walks diagonally toward the bow such that his path forms an angle delta = 28 degrees with a line perpendicular to the boat's direction of motion...

Homework Statement A boat is moving with constact velocity -1 + 6j. Find the direction in which the boat is moving, giving your answer as a bearing. The Attempt at a Solution http://img483.imageshack.us/img483/2457/bearintgsxk3.jpg Alpha is the bearing I want right? In the mark...

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...

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.