Boat Definition and 366 Threads

A boat is a watercraft of a large range of types and sizes, but generally smaller than a ship, which is distinguished by its larger size, shape, cargo or passenger capacity, or its ability to carry boats.
Small boats are typically found on inland waterways such as rivers and lakes, or in protected coastal areas. However, some boats, such as the whaleboat, were intended for use in an offshore environment. In modern naval terms, a boat is a vessel small enough to be carried aboard a ship. Anomalous definitions exist, as lake freighters 1,000 feet (300 m) long on the Great Lakes are called "boats".
Boats vary in proportion and construction methods with their intended purpose, available materials, or local traditions. Canoes have been used since prehistoric times and remain in use throughout the world for transportation, fishing, and sport. Fishing boats vary widely in style partly to match local conditions. Pleasure craft used in recreational boating include ski boats, pontoon boats, and sailboats. House boats may be used for vacationing or long-term residence. Lighters are used to convey cargo to and from large ships unable to get close to shore. Lifeboats have rescue and safety functions.
Boats can be propelled by manpower (e.g. rowboats and paddle boats), wind (e.g. sailboats), and motor (including gasoline, diesel, and electric).

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  1. L

    What is the velocity of a decelerating boat after 4.9 seconds?

    Homework Statement A boat, moving at the velocity of 9,9m/s turns off its engine and starts decelerating at the rate of a=-kv^2. What is the velocity of the boat after 4,9 seconds if the constant k is k=5,5m Homework EquationsThe Attempt at a Solution I tried to integrate deceleration to get...
  2. H

    Calculating Your Boat Winch's Pulling Capacity for Non-Mathematicians

    I am trying to determine what weight my boat ramp drum winch can pull. it has an electric 1HP motor that drives the drum via a chain and sprocket through a gearbox. what info is required to work out its capability. sorry as I am no mathematician but I do know there is a lot of variables...
  3. Pouyan

    Electric Field and Potential of a Line Charge on a Semi-Circular Sector Boat?

    Homework Statement A line charge has the total charge Q evenly distributed over a circle boat with radius a and sector 2β, placed according to the figure Find the Electric field E and the potential V in the origin. Homework Equations I know for this case that E(r) = (1/4πε) ∫ (λ(r')/R2)R...
  4. M

    Powering an LED strip with a 12v battery

    Hi, I want to run a cheap 5 meter led strip along the inside of my boat for cool night lighting. It will be powered by a 12v deep cycle battery. I was hoping y'all could double check what I was thinking before I set something on fire... Here is the led strip...
  5. A

    Find velocity of boat as function of the time

    Homework Statement a motorboat of mass m moves along a lake with velocity Vi. at the moment t=0 the engine of the boat is shut down, assuming the resistance of water to be proportional to the velocity of the boat f= -rv , find the velocity of the boat as a function of time Homework Equations...
  6. G

    Using a propeller to excavate sand under a boat

    Good day. I want to use the boat's propeller to excavate sand. This will be done using a tube which will deflect the thrust downward. What are the implications? The boat is anchored. Thus there is zero forward speed. I suspect this may change the properties of the way the propeller functions...
  7. X

    Does boat lean less when planing?

    When boat is stay in place,put on one side 500kg,boat will lean 15 degrees... If now we go planing with this boat, will boat lean less then 15 degrees or equal? If less,what is force which reduce lean angle?
  8. M

    MHB Boat B Must Head 56.4° South of West

    a boat A is heading south at 30 km/hr. its spotted a boat B which is 18 km due east of boat A. boat B has a max speed of 25 km/hr and wishes to get a close as possible to boat A. what direction should boat B head in. so i initially let boat A be the origin heading south. boat B starts at (18,0)...
  9. C

    Sinking Boat: Calculations & Results

    Homework Statement The bottom of the boat has dimensions a = 50 m, b = 10 m, the height of the ship is c = 5m. Impact created in the bottom a circular hole with a diameter d = 20 mm. The initial height of the upper edge of the ship above the water level is h = 3.5 m. The ship is empty and open...
  10. Dr. Courtney

    Insights Real Research in Unexpected Places - Boat Ramps - Comments

    Dr. Courtney submitted a new PF Insights post Real Research in Unexpected Places - Boat Ramps Continue reading the Original PF Insights Post.
  11. Macykc2

    Solving Boat Speed & Distance with Drag Force

    Homework Statement A boat with initial speed vo is launched on a lake. The Boat is slowed by the water by a force F=-αeβv. Find an expression for the speed v(t), and find the time and distance for the boat to stop. Homework Equations Drag force F=-αeβv alpha and beta are not specified as to...
  12. Yovanna

    Velocity and position of the boat

    Homework Statement A boat leaves the dock at t=0 s and heads out into the lake with an acceleration of 2m/s^2i.A strong wind pushing the boat, giving it additional velocityof 2m/si+ 1m/sj. (a) What is the velocity of the boat at t=10s? (b) What is the position of the boat at t=10? Homework...
  13. Arman777

    Friction Force and Decelerating Boat

    Homework Statement A 1000 kg boat is traveling at 100km/h when its engine is shut off.The magnitude of the frictional force ## \vec f_k## between boat and the water is proportional to the speed v of the boat:##f_k=70v##,where v is in meters per second and ##f_k## is in Newtons.Find...
  14. S

    Angle of pitch and heel for a boat snagged on the side wall

    Hi everyone, this is a real world problem following the sinking of a narrowboat in 2014. The boat caught on the side of the lock as the water level dropped, and the resultant combination of pitch and heel resulted in the boat taking on water at the stern and sinking - luckily with no loss of...
  15. Const@ntine

    Man Rows Boat: Force, Angle, Velocity Examined

    Homework Statement The man pushes the weightless stick, and so exerts a force with a magnitude of 240 N to the bottom of the lake. Hypothesize that the stick is in the same vertical as the boat's keel. At some point in time, the stick creates a 35 degree angle with the vertical and the water...
  16. betty0202

    Solving Boat Motor Engine Equations w/ Integration

    Homework Statement turning on the engine of a motorboat (v0=0), K = constant force due to the engine drag force of the water D = -cv find v(t)=? Homework Equations integration f=ma, a=dv/dt The Attempt at a Solution [/B] D+K = MA K-cv = MA (A=dv/dt) K-cv=Mdv/dt Mdv=dt(K-cv) ? i want to do...
  17. F

    Does a capsized boat of iron float?

    Hello Forum, I know that a block of iron would sink in water no matter its shape, unless we shape it like a boat in which case it will float. What if we turn that iron boat upside down? Will it still float? I don't think so since the concave area of the boat will slowly fill with water (which...
  18. E

    How far has the boat moved and in which direction?

    Homework Statement Jane and her little brother John are fishing, sitting at opposite ends of a boat (Jane on the left, John on the right). Jane is having incredible luck! John, not so much. Jane offers to switch places in the boat with John. Jane has mass of 50 kg, john has a mass 30kg, and the...
  19. tech99

    Can a sailing boat go faster than the wind when going in the downwind direction?

    If a sailing boat is running before the wind, i.e. with the wind exactly behind, is it possible for it to go faster than the wind? If one thinks of a wind generator on the boat it could perhaps operate an electric propulsion motor to give any desired speed? But what about the apparent wind when...
  20. F

    Power of Boat: Exploring R vs F

    Homework Statement A boat moving at constant speed v through still water experiences a total frictional drag F. What is the power developed by the boat? a) 1/2Fv b) Fv The Attempt at a Solution I know the correct answer is b. My confusion is why is a incorrect? My reasoning: The boat...
  21. C

    Find if the boat will see the flare, what angle will they?

    Homework Statement You have been stranded on a deserted island. Fortunately, you managed to bring a flare gun. You can see a ship 300. m off shore. Unfortunately, because of the daylight the ship cannot see your flare unless it is within 100. m of the ship. A.) If you fire the flare gun from...
  22. Evangeline101

    Newton's third law: Rower makes boat move forward

    Homework Statement Use Newton's third law to explain how a rower makes his rowing boat move forward through the water. Homework Equations no equations required The Attempt at a Solution According to Newton's third law, there is a reaction force for every action force. In this case, the...
  23. B

    Find the initial velocity of a man falling in a boat

    Warren falls over his tackle box and lands in a canoe 0.95 m below the side of the dock. Warren's mass is 70 kg and the canoe has a mass of 72 kg. Warren and the canoe move 1.73 m away from the dock in 1.005 seconds. relating equations are Vi = Vf - at v = d/t A = change in velocity/time...
  24. G

    "Build the best boat" with given area

    Hi. Given the area, what is the shape of an infinitely thin surface that can carry maximal load on water, i.e. has the best buoyancy just before water gets in? Is it the hemisphere?
  25. 4

    Center of mass and momentum in boat question

    Homework Statement A person with mass m is sitting on one end of a lifeboat of uniform density. Mass of lifeboat is 3m. The person then walks a distance of L to the other side of the lifeboat. Which of the following statements best characterizes the motion of the lifeboat? " The lifeboat...
  26. M

    MHB Sightseeing boat and writing equation

    A sightseeing boat is chartered by a social club at the rate of $10 per person. The club guarantees the boat company a minimum of 150 people. The boat company agrees to reduce the rate for all passengers by 5 cents a person for each additional person over the 150 minimum. Write and solve an...
  27. A

    B How to calculate center of mass & centerline a of a boat?

    Can anyone explain how to calculate the center of mass of a boat? and the centerline of a boat? Formulas, websites, anything helpful, just to let you know I haven't taken any high level physics classes so i don't know any of the fancy stuff lol. Thanks for the help
  28. D

    Archimedes principle boat displacement

    Homework Statement 35m^3 of a boat's volume is submerged under water. What does the boat weigh? The boat is 14 metres long. Homework Equations pVg=mg The Attempt at a Solution pVg=mg pV=m m=pV=1000*35 This is what my teacher said, but I don't understand it. The submerged volume of the boat...
  29. N

    2000 kg boat, motor force of 6000 N, resistance 2000 N

    Homework Statement A 2000 kg boat's motor can exert a force of 6000N. The water provides a resistive force of 2000N. What is the magnitude of the acceleration. Homework EquationsThe Attempt at a Solution that the boat has a 4000 N total force going foward
  30. a lone fishy

    Least time for boat to cross (theory)

    Homework Statement [/B] To cross a river with a current (flowing downstream) in the least amount of time, a boat should point a) directly at the opposite shore b) somewhat upstream c) somewhat downstream d) in a direction that will take the boat directly across e) downstreamHomework...
  31. RaulTheUCSCSlug

    Directional Derivative of Lake Depth at Point (-1, 2) in Direction (4, 1)

    Having a melt down as I have done this problem twice now and my exam is tomorrow and I can't seem to figure it out anymore... ugh. 1. Homework Statement The depth of a lake at the point on the surface with coordinates (x, y ) is given by D(x, y ) = 100−4x 2 −y 2 . a) If a boat at the point (−1...
  32. C

    Equilibrium Question Involving boat and scale

    Homework Statement A trailer carrying a boat is supported by a scale which initially reads 48 kg. The boat (and therefore its centre of gravity) is moved 0.15 m further back on the trailer. The scale now reads 37 kg. Find the mass of the boat (Ignore the 6.0 m distance because it was not given...
  33. C

    Velocity of boat connected by a pulley fixed at some height

    Homework Statement A pulley fixed on a wall of height h connects a toy boat with a man on the wall. The string is pulled by the man at a constant speed u m/s. Find the velocity of boat when the string makes an angle $$\theta$$ with the water. Homework Equations The question will be more...
  34. C

    Maximizing Boat Trailer Capacity: Redesign Tips & Tricks for Heavy Loads

    I need a little help on the redesign of our boat trailer, if you guys wouldn't mind giving a little advice. We have a heavy boat [we can assume the boat is 20,000 lbs], and we need to 1] increase the capacity of our axles, and 2] redistribute the loading of the weight. Currently, the weight of...
  35. J

    Calculate River Width: Boat Width Problem

    Homework Statement You are a member of a geological team in Central Africa. Your team comes upon a wide river that is flowing east. You must determine the width of the river and the current speed (the speed of the water relative to the earth). You have a small boat with an outboard motor. By...
  36. C

    Help with structural formula and absolute configuration

    1. Complete structural formula, identify the absolute configuration of each asymmetric center (if it applies) Bond rotation may be necessary2. Is the first one right? The second one which is Newman must be turned to boat and then I write it in the boat?The Attempt at a Solution : On the paper[/B]
  37. E

    How to Calculate Rowing Speed and Direction to Reach a Boathouse?

    Homework Statement You wish to paddle a boat across an 82 m wide river and land at a boathouse that is 14 m downstream of your starting point. If the current in the river is uniform at 0.50 m/s, how fast and in what direction do you need to row to reach the boathouse in 2.0 minutes? Homework...
  38. Kingyou123

    A boat travels down stream, then travels up stream

    Homework Statement What is the time needed to complete a trip if v = V. Homework Equations t=(2Dv)/v^2-V^2) The Attempt at a Solution I drew a diagram and tried plugging values in.
  39. P

    Using relative motion to find direction and time of a boat

    Homework Statement A motorboat can move with a velocity of 10.0 m/s, with respect to the water in a river. The river is flowing at 4.00 m/s due east. (a) Calculate the direction (Give the angle with respect to one of the compass directions.) the motorboat must be pointed so that it moves due...
  40. RLewis42

    Calculating Composite Center of Gravity -- Boat Rack for my Truck

    Hi, I'm new here, great forum! I am building a boat rack for the top of my truck for a particular boat and boat dolly. The boat will be upside down with the beach dolly attached. It is a side loader, so balance is critical. I need to calculate the combined Center Of Gravity (COG) of the boat...
  41. J

    What Determines the Zig Zag Pattern of Lightning?

    In a discussion about lightning destroying electronics on sailboats the issue of controlling lightning came up. One member (Baluncore) proposed that lightning is completely predictable. I've been taught that lightning is somewhat random. To me, random implies non-linear equations with sensitive...
  42. K

    How Much Work Does a Man Perform by Jumping Off a Stationary Boat?

    Homework Statement A man of mass m is on a still boat of mass M. the man jumps to the left so he has only horizontal velocity. Immediately afterwards the boat has velocity v. What's the work the man made. Homework Equations Conservation of momentum: ##m_1v_1=m_2v_2## Kinetic energy...
  43. TBan

    Use of Gyro/Accelerometer for Boat Tilt Application?

    Hello, I'm looking to try to use a gyroscope to determine the rocking motion (just side to side - not back and forth) of a boat while it is traveling forward or sitting still in the water. Specifically, I'm looking for the boat's angle from vertical and this angle's velocity. Can I do this...
  44. S

    Two people in a boat and one person throws a ball

    1. Two people sit at opposite ends of a boat. Ther person at the front of the boat has a ball and throws it to the person sitting at the back of the boat who catches it. What is the motion of the boat at the time immediaately after the ball is thrown and later after the ball is caught ? Answer...
  45. K

    Auto/Motor Building a mini physics motor boat -- Help?

    Should the propeller rotate clockwise or counter-clockwise? Which way will be faster and will allow the boat to accelerate the fastest?
  46. gracy

    How Is Drift Calculated in River Boat Problems?

    What is drift in river boat problems?Is it velocity of river divided by time taken o reach the point aimed?Or velocity of river-countering velocity of swimmer or boat in the direction of boat velocity divided by time taken o reach the point aimed?In the below video , although the accent is...
  47. PrincessIceFall

    How to find the depth of immersion of this boat model?

    So I am trying to find the depth of immersion of this particular boat model, which has curvilinear edges (subparabolic edges) on each side. The figure of the pontoon is shown below So now when I place this pontoon in water, the height of the water that rises, called the depth of immersion is...
  48. B

    Question regarding boat weight and paddling on the water

    Hi all, I am asking if I might have a premise or two correct. First a little background. And I beg your patience. I paddle on a Dragon Boat team. That is a 45' long canoe with 10 rows of two people for a total of 20 paddlers, plus a steers-person with an oar. The canoe with people weigh about...
  49. W

    What is the final speed of the boat?

    Homework Statement Jack and Jill are maneuvering a 3570kg boat near a dock. Initially the boat's position is https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char68.png2,0,9https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/144/char69.pngm and its speed is...
  50. 1

    Boat crossing a stream time taken

    Homework Statement In still water a boat travels at 6km/h. A stream is flowing south at 4km/h. Calculate the time it would take for the boat to travel directly across the stream and back if the stream is 1.5km wide Homework EquationsThe Attempt at a Solution
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