Posts Tagged ‘science’
Hot Air Balloon Experiments
September 9th, 2011 | 
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Hot Air Balloon Experiments
~webkinz~ trade~?~!~?
who wants to trade me on webkinz????
i just got 2 new pets and alot of stuff that i will trade!! i have.....
4 wacky bingoz coupons
1 googles pond
1 hot air balloon
1 circle of friends topiary
1 25% off coupon
1 70% off coupon
1 20% off coupon
2 50% coupons
2 30% off coupons
1 clock of the future
1 ultra mondern tv
1 game room tv
1 twister in a pot
1 country bed
1 experiment station 4
1 windmill
1 luv frog pond
1 elphant fountain
1 wetlands bathtub
1 donut plant
u can offer any thing and if i like it i will trade u. u must trade first cause i dont wanna be scammed. im casser101
theres more stuff!!
1 paw print fireplace
1 wacky tv
1 prismatic chair
1 best of the beach podium
1 cave bed
1 cocca basket bed
1 daredevil bed
1 chocolate egg
1 blue wagon
1 garbage can frige
2 curio shop dolls
1 jelly bean tree
1 magical medow bed
3 balloons
1 choclate bat
1 hyper candy bat
3 cinimon hearts
1 golden retrevier figure
I think that the circle of friends topairy sounds cool. And the 70% off coupon. And the donut plant. Im violet322 and I have nine webkinz. Are we supposed to send you three things and we get three things?????Email me!!!!
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hot air balloon experiment bags
Bungee jumping?
Belinda Stronach bungee jumps from the basket of a hot air balloon (at a fixed altitude of 57 m) and wishes, on her first bounce, to come within exactly 2.0 m of the ground, to strike a surprise blow on Tie Domi, who is standing directly below. In an earlier experiment she found that a 5.0 m length of bungee cord (manufacted by Magna) stretches by 1.5 m under her weight. What length, L, of bungee cord should she use? Answer in m.
The answer is 26 m but how?
hooke's law state F=-kx
let mass of woman=m, acceleration due to gravity=g
in test x=1.5 and F=mg (from F=ma, newton 2)
=> mg=-(k*5)*1.5
(we use k*5 because there are 5 meters of cord and k is newtons per unit length)
=> -k=(mg)/7.5 (1)
At the bottom of the first bounce the Potential energy stored in the cord must equal the potential energy difference between woman in the balloon and at the bottom of the bounce.
PE=mgh=55*mg (h=57-2=55)
U=(kx^2)/2 (2) (potential energy stored in a linear spring)
substituting (1) into (2) gives
U=(mgx^2)/15
since PE=U (at the bottome of the first bounce)
=> (mgx^2)/15=55*mg (note mg terms cancel)
=>x^2=55*15=825
=>x=29 meters (to two sig fig)
let L be unstreched length of cord
L=55-x (55 being the streched length and x obviously the extension)
=>L=55-29= 26 meters
Posted in Ride In A Hot Air Balloon | 
Tags: education, experiments, games, hot air balloon experiments, hot air balloon experiments for kids, matter, science, science experiments hot air balloon | 
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