Answers
I'm thinking of buying a battery powered lawn mower, either Newton or (I believe) Black and Decker. They are pricey though, and before I throw away $400 I wanted to see if anyone had any experience with these. Do they work as well as regular mowers? Do the batteries last as long as they say they do? Any advice would be helpful. Thanks!
I have a 24v Yardworks one and am very happy with it. I love the quiet operation, and the fact that if I want to stop mowing for a few minutes to clear away branches or dog toys, it stops as soon as I take my hand off it. No monster roaring away in the background, and no yanking to re-start. No having to remember to fill up a gas can, either. I like the fact that I can leave it out in the carport, without battery, knowing that it's pretty much worthless without the battery so isn't likely to be stolen. They have limitations, obviously. They aren't as flat-out powerful as a gas one. You get so much per charge and that's it until you recharge unless you get a spare battery and they're expensive. Recharge from flat seems to take 6-8 hours. But mine will go through small branches and tough weeds pretty easily. I have about 150 x 100 worth of lawn and can cut that on one charge unless it's a few inches long or a bit wet. Then I might get 3/4 of it done on one charge. Going into a 3rd season with it now and haven't noticed any loss of power.
A lawn mower is pushed with a force of 42 newtons along the handle at 38 degrees with the lawn. In mowing, the lawn mower is pushed over a total horizontal displacement of 0.800 km.
a. what is the x-component of force?
b. what is the y-component of force?
c. how much work is done?
Fx = 42 cos 38 = 33.1N
Fy = 42 sin 38 = 25.9N
W = Fx d = 33.1 x 800 = 26480Nm
the lawn mower is pushed over a tatal horizontal displacement of 0.800 km.What is the x-component of force?How much work is done?
x component is 42newtons times cos 38 degrees=34.7 newtons. Work done= 34.7 newtons times 800 metres=27760 joules.
A man pushes a lawn mower with a force of 25 newtons. The lawn mower has a mass of 17 kilograms and the handle makes an angle of 60 degrees with the horizontal. How much work is done if the lawn mower is pushed a total of 500 meters?
a-83,300 J
b-6,250 J
c-12,500 J
d-8,500 J
Work= Force x Distance
Distance= 500 meters
Force=25
Work is measured in Joules so 500 x 25 = 12500
Final answer: c-12,500 J
Your younger brother is supposed to mow the lawn using a push mower. He reasons from Newton’s third law that the mower will push back with the same force he exerts on the mower; therefore nothing will move and attempting to mow the lawn is pointless. What is wrong with his reasoning?
we learned this....in science. this year.....cept with a cart and horse. i wood say ur bro's an idiot and he shood just mow it but i guess u need more reasoning. i dont no if i can explain it, but i can give u a link which can explain it.
http://www.batesville.k12.in.us/physics/ PHYNET/Mechanics/Newton3/HorseAndCart2.h tml
Woot : Neuton CE 6 Battery-Powered Lawn Mower
Battery-Powered Mower!”
“What? No! That means -”
“That’s right! You never ran over the power cord during that freak atomic hailstorm! The electric lawnmowing accident that gave you your powers never happened! And it was so simple! Your old, pre-superhero self fell for its easy, clean battery-powered operation like a blade of mown grass! All I had to do was let you hear its quiet motor and point out how cheap it is to operate, and you walked right into my trap – pushing the Neuton before you! Nyah-ha-ha!”
“You scum! Striking at a man… through his lawn? That’s sick even… for you!”
“Nobody put a gun to your head! By the time I explained that its battery packs the most power of any removable battery on the market, you were mine! I never even had to mention the on-board string trimmer/edger sold separately ! Any moment now, the temporal shockwaves will eradicate your do-goodery forever!”
...SocialYell Sustainability News :: Environment Health :: Neuton ...
On a beautiful sunny summer day there’s nothing better than sitting out on the porch, relaxing and reading a book among the blooming perennials in my parent’s suburban yard. That is until a neighbor pulls that cord and revs up their lawn mower, drowning out twittering birds and shattering my peace . So when I saw that the Neuton Battery Powered Lawnmower makes less than half the noise a gas mower does, that made me smile.
reported:“… study after study has found that community noise is interrupting our sleep, interfering with our children’s learning, suppressing our immune systems and even increasing — albeit just a little — our chances of having a heart attack. It is also tarnishing the Golden Rule, reducing people’s inclination to help one another.”
...News
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