 |
No items matching your keywords were found.
|
No items matching your keywords were found.
force powerboats
Impulse and momentum question, WHERE HAVE I GONE WRONG?
A powerboat is going at 80 km h–1 when its motor is turned off. In 5.0 seconds its velocity decreases to 50 km h–1. The boat and its passengers weigh 1 tonne.
Calculate the average force exerted on the boat by the combined drag of the air and the water.
MY ANSWER:
p1 = mv
= (1000)(1.3x10^3)
= 1.3x10^6 Kgms^-1
p2 = (1000)(0.83x10^3)
= 0.83x10^6 kgms^-1
Δp = (0.83x10^6) - (1.3x10^6)
= -0.47x10^6
F = Δp/Δt
= (-0.47x10^6)/5
= -94000N
and the answer is -1700N????
I think you have calculated your speeds wrong....
80km/h is 22.2m/s - you have only divided by 60 (giving m/min)
|
No items matching your keywords were found.
|
No items matching your keywords were found.
| | Pair of thigh Straps $39 Adjustable thigh straps give you more stability in rough whitewater or ocean conditions. They also help transfer the force of paddling to the water, improving speed and reducing fatigue. Fits all Explorer Kayaks. Set of two: adjustable 21-55" |
| | 8' AB40 paddle $95 The asymmetrical spoon blade design of this Kayak paddle allows for smooth entries and an even pull, maximizing the power from your stroke. They require less gripping force, less effort per stroke. Weighs 2.92 lbs. Snap lock buttons to disconnect into 4 parts. |
 | Scholastic Discover More: Technology List Price:  |
DescriptionA new-generation reference book about the cool technology of our world, for kids used to surfing and swiping.Our world is full of funky gadgets and technological gizmos. Within the next hour, you will probably use a computer, the internet, a hand-held game, or a cell phone... |
 | Canoe and Kayak Routes of Northwest Oregon: Including Southwest Washington List Price: |
DescriptionThe only complete guide to flatwater canoe and kayak routes in northwest Oregon and southwest Washington--now completely updated! Phillip Jones has been exploring the Northwest by canoe and kayak for more than 20 years, and presents his favorite outings in this completely revised guide to paddling the flat-water rivers and lakes of northwest Oregon and southwest Washington... |
 | Performance Sailing and Racing List Price: |
DescriptionFrom a racing master, all the knowledge you need to make your boat go faster and safer in any condition In Performance Sailing and Racing, Steve Colgate explains how to improve your sailing and push your boat to higher but safer speeds... |
 | Aircool New Men's Genuine Leather Health Walking Shoe |
DescriptionAircool brand is using the latest high-tech fabrics and the leading technical bold and used for making shoes.Every shoes are come from the brand exclusive of the best designers, and length of service in more than twenty years old shoemaker, cooperated by the exquisite sewing process, for the purpose of comfort, make practical and with classic... |
 | GAS Spring Lift for Boats and Rvs - 20'' Extended, 50 Lbs - Attwood |
DescriptionAttwood Gas Spring 50 lb. The most popular replacement gas springs for the aftermarket! Attwood has taken the guesswork out of deciding which SpringLift Gas Springs and Mounting Brackets to offer Marine and RV customers... |
 | Aircool Men's Genuine leather Traveling Visiting Tour Journey Outdoor Shoes Light-brown Size 9.5 List Price: |
DescriptionAircool brand is using the latest high-tech fabrics and the leading technical bold and used for making shoes.Every shoes are come from the brand exclusive of the best designers, and length of service in more than twenty years old shoemaker, cooperated by the exquisite sewing process, for the purpose of comfort, make practical and with classic... |
Brazilian Fastest Power Boat !!! Force One Power Boats +100mph!
Comments on this entry are closed.