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boats moving through water
can you help me answer this?
Sprinting near the end of a race, a runner with a mass of 65 kg accelerates from a speed of 6 m/s to a speed of 7 m/s in 2 s.
(a) What is the runner's average acceleration during this time?
m/s2
(b) To gain speed the runner produces a backward force on the ground, so that the ground pushes the runner forward providing the force necessary for acceleration. Calculate this average force.
N
The air exerts a forward force of 10 N on the propeller of a 0.40 kg model airplane. If the plane accelerates forward at 4.0 m/s2, what is the magnitude of the resistive force exerted by the air on the airplane?
N
A boat moves through the water with two forces acting on it. One is a 1500 N forward push by the motor, and the other is an 1100 N resistive force due to the water.
(a) What is the acceleration of the 900 kg boat?
m/s 2
(b) If it starts from rest, how far will it move in 6.0 s?
m
(c) What will its velocity be at the end of this time?
m/s
1. delta V / delta t or change in velocity divided by change in time. 1meter per second divided by 2 seconds = .5m/seconds squared
2) F=ma or Force (in newtons) = mass (in kg) times the acceleration (im m/s2) or .5*65 pr 32.5N
3 force 1 +force 2 or 10N + .4*4.0 or 11.6 N
4A) 1500N-1100N = 400N forward F=ma or in this case a=m/F or 900kg/400N = 2.25 meters per second squared.
B)a=V/t and V=S/t therefore a=s/t2 therefore S=at2 or 2.25*36 or 81 meters
c)2.25*6 or 13.5m/s
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Sit in Bow - Boat Moving Fast on McCloud Lake Branch
what is the acceleration of the 1000kg boat?
a boat moves through the water with two forces acting on it. one is a 2 000- N forward push by the water on the propeller, and the other is a 1 800-N resistive force due to the water around the bow.
Force = mass x acceleration
(2000 - 1800) N = 1000 kg x acceleration
acceleration = 200 kg*m/s^2 / 1000 kg = 0.2 m/s^2
Aloha
{ 4 comments }
Hi Marcus,
My 14 y.o. son is very keen on 3D and saved up and got C4D. We have made and purchased some models of boats and now want to make simple animations of the boats moving in water for use as learning videos for my boat school. We are only small so cant afford expensive animation studios and are trying to do it as much as possible ourselves with experts hired occasionally. I noticed your perfume ad and wondered if you could do some water scene that we could then work with and integrate our models in for various short videos.
regards
Mike
To use a volvo penta stern leg as an example, power tilt means that the leg has tilt feature only, usually operated by a mechanical/electrical device. Tilt is for either beach or trailer position only. The actual leg trim is adjusted by pin and rack device like an outboard.
Power trim is found on later model stern legs and is operated by hydraulic cylinders. The leg can be trimmed from a negative position to a positive position (eg minus 4 to plus 5 degrees) to enable the vessel to be trimmed to suit water conditions. By pushing an over ride switch the leg will continue to lift to a beach or trailer position. Normally the engine is turned off to go to beach position.
Birds, things that are in the water (boats, buoys, wood) and fast moving ants are my weakness.
Yes you are right.
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