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. S

    What is the velocity of the boat after a package is thrown from it?

    Homework Statement A child in a boat throws a 6.40kg package out horizontally with a speed of 10.0 m/s. Calculate the veolcity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.0kg and that of the boat is 45.0kg. Ignore water resistance...
  2. F

    Calculate Boat's Velocity After Package Thrown - Boat Linear Momentum Problem

    A child in a boat throws a 6.40kg package out horizontally with a speed of 10m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.0kg and the mass of the boat is 45.0kg. Ignore water resistance. Relevant equations MV1 +...
  3. Saladsamurai

    Help Solve Differentiation Problem to Slow Boat Speed to 45 km/h

    So I posted this earlier and it got to a point where differentiation is neccessary. I am a little familiar with differentiation, but not to the point where I know how to apply the concepts I have recently learned in Calculus. i would greatly appreciate somebody walking me through the...
  4. Saladsamurai

    Boat Friction Physics Problem: Finding the Time to Slow from 90km/h to 45km/h

    Homework Statement A 1000kg Boat is traveling 90km/h when its engine is cut. The magnitude of the frictional force fk is proportional to the boat's speed v: fk=70v, where v is in m/s and fk is in Newtons. Find the time required for the boat to slow to 45 km/h. Homework Equations...
  5. D

    What truly drives you? Is it wealth, power, or something else?

    An assumption that arises periodically and many times recently across a number of threads is that we are all driven by motives such as wealth or power. Now I have no personal experience about being really wealthy. My income has varied between nothing and 350K/yr. The odd thing is that when I...
  6. I

    Falling From a Boat: Relative Velocity Explained

    All, I am an avid kayaker, and recently got into an argument with another kayaking friend of mine over (what I think is) an issue of relative velocity. The question was this: A person is sitting in a kayak and that kayak is in a constant velocity current (say, 3 knots), but the kayak is...
  7. Q

    What forces are involved in an inclined elevator boat lift?

    Hi, I have a question regarding the forces involved in an inclined elevator boat lift. Attached is a diagram of the setup. I was wondering what forces are involved. I know that there is a torque that is exerted on the inclined arm equal to the weight of the boat times the distance of the...
  8. D

    Solving a Boat Navigation Problem: A Family's Journey Downstream

    Homework Statement A Family has a boat which can travel at 12 m/s in still water. They are using it to reach a point 500m downstream on the other side of a river 300m wide, and flowing at 4 m/s. What heading must they take, relative to their starting point, in order to reach their destination...
  9. M

    Build Boat Lift w/ 10,000 lbs Capacity: Tips & Advice

    I am trying to build my own boat lift that uses plastic tanks submerged to lift the boat when they become filled with air. My problem is that I need to lift about 10,000 lbs and i don't know how large the tanks need to be ( how much water they need to displace ) to lift that amount of weight...
  10. J

    Calculating Buoyancy of Steel Boat

    [b]1. The bottom of a steel "boat" is a 4.00 m x 10.0 m x 4.00 cm piece of steel (rho=7900). The sides are made of 0.490 cm-thick steel. Homework Equations Fbouy = Wobj The Attempt at a Solution i have gone around in so many directions that I am pretty much lost...is okay to...
  11. C

    Solving Ice Boat Problem Homework Statement

    Homework Statement A 600- kg ice boat moves on runners on essentially frictionless ice. A steady wind blows, applying a constant force to the sail. At the end of an 7- s run, the acceleration is 0.4 m/s2. What was the acceleration at the beginning of the run? Answer: 0.4m/s What was the...
  12. R

    Board the Boat When It's Within 10cm of the Dock

    A boat(1500kg) is on a lake exibiting SHM with an amp of 20cm bobbing on the waves. The boat takes 3.5s to make one complete up and down cycle. When the boat is at its highest point it is at the same level as the dock. You will only board the boat if it is within 10cm of the dock. How much...
  13. R

    News The terrorists might come by boat, perhaps into Minnesota

    The U.S. coast guard is attempting to justify sending machine guns to patrol the Great Lakes, in response to the endemic terrorism in that region: (NYT) One might suggest northern Minnesota is an odd place to spend federal anti-terrorism money...
  14. K

    Boat Acceleration: Calculate Force, Mass & m/s^2

    a boat moves through the water with 2 forces acting on it. one is a 2021N forward push by the motor on the propeller, and the other is an 1774N resistive force due to the water around the bow. What is the acceleration of the 1146kg boat? Answer in units of m/s^2. would i use a=f/m for this...
  15. K

    Boat Statics, Mastering phyics problem.

    Information given: boat owner pulls her boat into the dock shown, where there are six capstans to which to tie the boat. She has three ropes. She can tie the boat from the boat's center (A) to any of the capstans (B through G) along the dotted arrows shown. Suppose the owner has tied...
  16. T

    Another Boat Question. Need help though

    There is only one boat. The boat can support a tiger and it's owner, or 2 owners. There are 3 tigers and 3 owners. When a owner leaves a tiger alone, the tiger will eat everything around it (tigers or humans). One of the tigers can row the boat. How do you get all the tigers and their owner...
  17. M

    How Is Net Work Calculated When Pulling a Boat?

    http://img517.imageshack.us/img517/6533/c6p4ty2.jpg The drawing shows a boat being pulled by two locomotives through a canal of length 1.04 km. The tension in each cable is 4.27 x 103 N, and theta = 20.0o. what is the net work done on the boat by the two locomotives? Here is what I've...
  18. N

    Total displacement of sail boat

    A sailboat tacking against the wind moves as follows: 5.8 km at 45 degrees east of north, and then 4.5 km at 50 degrees west of north. The entire motion takes 1 h 15 min What is the total displacement? What is the average velocity of this section of the trip? What is the speed, if it is...
  19. M

    Boat Velocity in a River: Angle for 4.0km/h & 1.8km/h

    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...
  20. T

    Find Force F(v) of Boat Drag Force: Barger's Classical Mechanics

    I have a question about a physics problem, this comes from Barger's Classical Mechanics: A boat is slowed by a drag force, F(v) and its velocity decreases according to the formula v=c^2(t-t_{1})^2 where c is a constant and t_{1} is the time at which it stops. Find the force F(v) as a function...
  21. russ_watters

    Can Wake Riding Slow Down a Lead Boat?

    A friend of mine emailed me this question: At first glance, I expected it to be easy, but I'm really not sure what the answer is! Drafting in a car works because the rear car pushes a high pressure area in front of it, partially filling the low pressure area behind the lead car, reducing...
  22. Astronuc

    Can a Boat Really Fly? Exploring the World of Hydrofoils and Hovercrafts

    http://media.putfile.com/HydroFoam Something Cyrus might appreciate and enjoy. :biggrin:
  23. L

    Why would jumping on a shoe box boat cause odd propulsion?

    Im standing on a shoe box shaped boat, I put myself on the front of it and start jumping Will i be propelled backwards of forwards, why? Thanks in advance
  24. T

    Initial horizontal velocity of the boat

    in a water tank involving the launching of a small model boat,the model's initial horizontal velocity is 20ft/s and its horizontal acce varies linearly from -40ft/s^2 at t=0 to -6ft/s^2 at t=t(1) then remains equal to -6ft/s^2 until t=1.4s.Knowing that v=6ft/s when t=t(1), determine the value of...
  25. A

    What is the acceleration of the 1000 kg boat?

    A boat moves through the water with two forces acting on it. One is a 2000 N motor, and the o ther is an 1800 N restive force to the water. 1) What is the accelration of the 1000 kg boat? Did I do this right? a) (2000 cos 90 + 1800 cos 270 ) i + (2000 sin 90 + 1800 sin 270)j = 3800j N...
  26. F

    What is the solution to the Ferry Boat HW Problem?

    Two ferryboat each traveling at different constant speed start at the same instant from opposite sides of the Hudson River, one going from New York City to Jersey City and the other from Jersey City to New York City. They pass one another at a point 720 yard from New York City shore. After...
  27. L

    What is the net work done on the boat by the two locomotives?

    The drawing shows a boat being pulled by two locomotives through a canal of length 2.39 km. The tension in each cable is 4.17E4 N, and = 16.7°. What is the net work done on the boat by the two locomotives? first I used W=fd... i multiplied 4.17E4 * 2 = 8.34E4 to get the total tension in...
  28. C

    What is the acceleration of the 1200 kg boat?

    I have a worksheet I received for make-up since I was absent. It is really hard since I miss the lesson. All the problems are similar, but I do no know where to start. Here is a sample problem. Will someone show me steps on how to do it? A boat moves through the water with two forces acting...
  29. P

    Windmill boat on river, no wind

    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...
  30. S

    Making a Rocket Car or Boat - Tips and Ideas

    i used to do model rocketry but have given it up for some time...i was rummaging through old stuff and found about 10 C-sized motors and began thinking what i could do with them. if i find some spare time i might make a simple rocket car or rocket boat. however, do ppl have tips (other...
  31. P

    Windmill boat on river, no wind

    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...
  32. Ivan Seeking

    Mysterious 'stealth' boat plying Columbia River

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

    Cardboard boat building for AP Physics help

    Can anyone provide advice for this? We will be putting them in the school's pool and racing them. But I really want some advice. (1) Formulas to find if the boat will float or sink (we'll be able to make measurements and stuff). (2) Plan ideas. (3) Stuff to focus on in building. We...
  34. A

    Calculating Bouyant Force & Volume of Water for Cardboard Boat

    I need to calculate the bouyant force of a cardboard boat and the bouyant force exerted by the water. What is the equation to do this? Also, I need to the volume of water the boat displaces. (Density of water is 1000 kg/m^3). And last but not least, I need to determine the water level on...
  35. J

    What Direction Does the Boat Move When Viewed from Different Sides?

    When seen from the left side of the boat it goes toward the rear. When seen from the right side of the boat it goes toward the front. When seen from behind the boat it goes toward the right side. What is it?
  36. G

    How Do Wave Heights Impact Pleasure Boat Speed?

    Has anyone developed an approximation for the effects of different heights of sea waves on a pleasure boat performance? For example, if in calm water, a powerboat's speed is 20 kts., what would that boat's speed be if the sea conditions changed to 4-6 ft waves while holding all the other...
  37. V

    Boat Drag Question: Acceleration After Rain Starts

    A boat of mass 250kg is coasting, with its engine in neutral, through the water at speed 3.00m/s when it starts to rain. The rain is falling vertically, and it accumulates in the boat at the rate of 10.0kg/hr. Assume that the boat is subject to a drag force due to water resistance. The drag is...
  38. tony873004

    Work Done by Horses & Friction on Canal Boat

    Two horses on either side of a canal pull a canal boat of mass 1.0*10^4 kg at a constant speed for a distance of 10.0 km. (Figure 7.32). One horse exerts a force of 3.0*10^2 N at an angle of 20º to the canal, and the other exerts 5.0 * 102 N. Find the work done by each horse and the work done...
  39. P

    Calculating Boat Speed with Rainfall Accumulation

    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 it accumulates in the boat at the rate of 10.0 kg/hr. using this formula: mb*vb/(mb+k0+t1) i got an answer of 2.86, but it's...
  40. K

    Time of boat completing round trip

    A boat made a round trip of 3km on a river in 2h. The speed of the river's flow was 1m/s. In what time will the boat complete the same round trip, if the speed of the flow is 2 times smaller? I suck at these kinds of questions, so would anybody please help me out here? - Kamataat
  41. R

    Building a Human-Powered Boat for Physics Class

    i am building a human powered boat for my physics class. does anyone have any design tips or powering mechinisms that could be of use? please help me!
  42. R

    Building a Human-Powered Boat with Recyclable Materials

    does anyone know of recycleable materials (strongest and less dense than water) that can be used to build a human powered boat?
  43. C

    What is the velocity of the boat relative to the water

    Bernie is showing Margaret his new boat and its auto-navigation feature, of which he is particularly proud. "The island is 1 km east and 3 km north of this dock. So I just punch the numbers like this, and we get ourselves refreshment and enjoy the scenery." 45 min later, they find themselves...
  44. S

    How to Solve for Boat Velocity Relative to River

    Help Please! I've been working on this problem for 3 hours atleast now. I just need to know how to work it. The problem has a boat moving southeast at 0.380 m/s relative to the earth, and the river is flowing east at 0.460 m/s relative to the earth. I need to know how to get the veloctiy of the...
  45. P

    Optimizing Boat Direction in a River with Current: A Vector Diagram Approach

    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:
  46. F

    Find the mass of this boat using torque

    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. Kinda looks like this: _______\___boat___/__...
  47. H

    Calculate the initial recoil spped of the boat

    1. A 75KG man stands in a 100kg rowboat at rest in still water. He faces the back of the boat and throws a 5kg rock out of the back at a speed of 20 m/s. The boat recoils forward 4.2 m.. Calculate the initial recoil spped of the boat, the loss in mecahnical energy due to friction, the effective...
  48. Q

    Calculating the Minimum Height for a Steel "Boat" to Float

    The bottom of a steel "boat" is a 6.00 m x 9.00 m x 5.00 cm piece of steel(density of steel = 7900 kg/m^3) . The sides are made of 0.460 cm-thick steel. what minimum height must the sides have for this boat to float in perfectly calm water? in cm i have that F_B (buoyancy force) is equal...
  49. K

    Find the time required for the boat to slow to 45 km/hr

    hey A 1000 kg boat is traveling at 90km/h when its engine is shut off. The magnitude of the frictional force between boat and water is proportional to the speed v of the boat: force of kinetic fricition=70v, where v is in meters per second and the force is in Newtons. Find the time required...
  50. K

    Maximizing Jump Distance from a Small Exploding Boat

    hi all, i am just wondering... if there is a guy has to jump off a small boat (u know... those have no engine, and etc... just a small wooden boat) which is stay stationary in calm water and is about to explode (for some reason... ). so yeh, that guy has to jump off the boat from one of the...
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