Boat Definition and 366 Threads

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...

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...

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...

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...

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...

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...

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?

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)...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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?

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...

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...

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

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...

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

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...

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...

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...

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...

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...

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...

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]

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...

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.

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

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...

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