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A wrecking ball swings at the end of a 11.9-m cable on a vertical circular arc. The crane operator manages to?
A wrecking ball swings at the end of a 11.9-m cable on a vertical circular arc. The crane operator manages to give the ball a speed of 10.7 m/s as the ball passes through the lowest point of its swing and then gives the ball no further assistance. Friction and air resistance are negligible. What speed vf does the ball have when the cable makes an angle of 24.7 ° with respect to the vertical?
Answer: When the ball is in its 24.7 deg. position the vertical distance it is below its point of suspension is
x = 11.9 cos 24.7
x = 10.8m
The distance it is above its lowest point is
h = 11.9 - 10.8
h = 1.1m
The potential energy of the ball at 24.7 deg. is
PE = M g h (M = mass of ball)
PE = M 9.8 1.1
PE = 10.8M
The kinetic energy at lowest point is
KE = 1/2 M v^2
KE = 1/2 M 10.7^2
KE = 57.2M
The kinetic energy at 24.7 is
KE2 = KE - PE
KE2 = 57.2M - 10.8M
KE2 = 46.4M
The velocity at 24.7 can be found by
KE2 = 1/2 M v^2
46.4M = 1/2 M v^2 (M cancels)
v = sq.rt.(2 x 46.4)
v = 9.6 m/s
Category: Engineering
Miley Cyrus Bares All for 'Wrecking Ball' - Video | Rolling Stone
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THE TV WATCH; The Spirits Of TV Past, Present And Future
No, Virginia, there may not be any new Christmas specials starring Eva Longoria as Slutty Santa and Mary-Kate and Ashley Olsen as elves. And while many viewers may consider that potential consequence of the writers strike a cause for seasonal celebration, its not as merry a prospect as one might think. Not that many people cared or even noticed - Writers strike begins and some TV shows stop production, but there are other viewing options; people can watch DVDs, old episodes of shows on network Web sites or saved on TiVo or more reality and news programs, which are not affected by strike (M) - By ALESSANDRA STANLEY
SPORTS OF THE TIMES; Bostons Jewel Is Polished And Nearly Flawless
Boston Twelve years after condemning it to a wrecking ball, I believe I owe Fenway Park an apology. Enhanced architecturally and finally blessed by visionary baseball management, the red-brick landmark was glowing brighter than ever in the blustery autumn chill for the start of the Red Sox-Indians American League Championship Series on Friday - Harvey Araton Sports of The Times column contends that Fenway Park (Boston), home of Boston Red Sox, is perfect stadium (M) - E-mail: hjaraton@nytimes.com - By HARVEY ARATON
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By how much has the gravitational potential energy of the ball changed?
A 1400kg wrecking ball hangs from a 16m -long cable. The ball is pulled back until the cable makes an angle of 30.0 degrees with the vertical.
Answer: Increase in vertical height is
h = 16 - 16cos30 m = 2.14 m
So the increase in GPE is
GPE = m*g*h = 1400 * 9.81 * 2.14 J = 29440 J = 29.4 kJ (3 s.f.)
Category: Physics
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ssm A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the?
ssm A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.7 s. Find the time it takes for the ball to fall from rest all the way to the ground.
Answer: x(t)= (1/2) gt^2
Let x(t) = D= full distance to the ground
d/2= (1/2) gt^2
d= (9.81)(1.7)^2
(9.81)(1.7)^2= (1/2)(9.81)t^2
(1.7)^2= (1/2)t^2
(1.7)^2 / (1/2)= t^2
sqrt (2*(1.7^2))= t
Category: Physics
If the mass of the wrecking ball is 4030 , what is the tension in the cable that makes an angle of 40.0 with
A large wrecking ball is held in place by two light steel cables .If the mass of the wrecking ball is 4030 kg, what is the tension in the cable that makes an angle of 40.0 degrees with the vertical?If the mass of the wrecking ball is 4030kg , what is the tension in the horizontal cable?
Take the free fall acceleration to be = 9.80 .
Answer: There are 3 forces on the ball T1, T2 and mg. Because ball is at rest their vector sum is 0. If you draw this vector sum you would get right triangle with sides mg and T2 (horizontal) and hypothenuse T1 (inclined cable). From this triangle T1 = mg/cos(40) while T2 = mg*tan(40)
Category: Physics
When a wrecking ball hits a wall, it is not moving fast. How can it have enough momentum to knock down a wall?
When a wrecking ball hits a wall, it is not moving fast. How can it have enough momentum to knock down a wall?
Answer: the other half of the momentum equation is *mass*
a train might have a low speed (say 5mph), but if your car hits it head on while going 100mph, the train will not slow down one bit.
so this about the *combination* of mass and speed.
Category: Physics
ARCHITECTURE; High Noon in New Orleans: The Bulldozers Are Ready
Ever since it took over the public housing projects of New Orleans more than a decade ago, the Department of Housing and Urban Development has been itching to tear them down. Now, after years of lawsuits and delays, it looks as if the agency will finally get its Christmas wish. The New Orleans City Council is scheduled to vote on Thursday on - Nicolai Ouroussoff column on upcoming decision by New Orleans City Council on whether to approve demolition of three public housing projects; holds belief by federal officials that decision, in wake of Hurricane Katrina, is good social policy reflects ruthless indifference to local realities; holds some projects rank among best early examples of public housing built in US, both in design and quality of construction; photos (M) - By NICOLAI OUROUSSOFF
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Find the total time it takes for the ball to hit the ground?
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the way to the ground.
Answer: The acceleration due to gravity is a=9.8 metres per second squared.
The integral of acceleration is velocity. v = 9.8 * t, metres per second, where v is the velocity at time t, and t is in seconds.
The integral of velocity is displacement (distance) s (t) = 9.8 / 2 * t ^2
So, s(1.2) = 4.9 * (1.2)^2 = 7.056 metres.
If this is half the distance, then the full distance is 14.112 metres.
The time, then, is t= sqrt(14.112 /4.9) = 1.697 seconds.
Category: Physics
Miley Cyrus Cries and Goes Nude in 'Wrecking Ball' Video [GIFs]
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What speed vf does the ball have when the cable makes an angle of 19.1 ° with respect to the vertical?
A wrecking ball swings at the end of a 12.0-m cable on a vertical circular arc. The crane operator manages to give the ball a speed of 12.3 m/s as the ball passes through the lowest point of its swing and then gives the ball no further assistance. Friction and air resistance are negligible. What speed vf does the ball have when the cable makes an angle of 19.1 ° with respect to the vertical?
Answer: Solution:
Energy conservation:
1/2 mu2 = 1/2 mv2 + mgh
simplify n remove mass m
u2 = v2 +2gh
where u = 12.3 m/s ; g = 10m/s2 ; h= 12 -12 cos 19.1 =0.66 m
final speed v2 = 12.3 *12.3 -2* 10* 0.66 = 151.29 - 13.2 = 138
v = 11.78 m/s
very simple
Category: Physics
What would happen if someone was hit in the head by a wrecking ball?
One of those wrecking ball that they use to destroy a building?
Would it decapitate a person?
Has it ever really happened?
Answer: If it happened I don't think the person would be around to talk about it. I don't think it would decapitate a person's head, I think it would mash it terribly. I don't know if it has ever happened or not.
Category: Decorating & Remodeling
Gravity Q...How long does it take for the ball to fall from rest all the way to the ground?
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.2s. What is the time it takes for the ball to fall from rest all the way to the ground?
Answer: S = voT+ 1/2 g T^2
then S1/S2 = (T1/T2)^2
1/2 = (1.2/T2)^2
THEN T2= 1.2sqrt2= 1.6971 sec
Category: Physics
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What is the name of this movie? House with a wrecking ball and leprechaun?
Quite an old film where the main character is a girl and meets a leprechaun, i remember a house and a wrecking ball and at the beginning of the movie the leprechaun runs out infront of a car
Answer: The original Leprecaun movie (with Warwick Davis and Jennifer Aniston) sounds familiar for that, a house fets wrecked but I don not exactly remember the wrecking ball aspect.
Category: Movies
IN THE GARDEN; What the Acorn Grew Up to See
AN American sycamore in Sharpsburg, Md., was just a sapling beside a stone bridge when Union troops blocked the first Confederate invasion of the North during the horrific battle at Antietam Creek in 1862. Its still standing by the bridge, said Charles A. Birnbaum, president of the Cultural Landscape Foundation in Washington, which draws - Anne Raver reviews photographic exhibit of endangered trees and landscapes, sponsored by Cultural Landscape Foundation, Garden Design magazine and others, at George Eastman House International Museum of Photography and Film in Rochester, NY; photos (M) - By ANNE RAVER
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CRITICS CHOICE; New CDs
Gary Allan Living Hard (MCA Nashville) In 2005 the California country singer Gary Allan released Tough All Over, a somber and often beautiful album that was inevitably heard in the context of a real-life tragedy: His wife had committed suicide the year before. Now hes back, and apparently he has decided to crank up the guitars and have a - By KELEFA SANNEH
BEHIND THE WHEEL | 2008 CADILLAC CTS; Ready for Download: CTS 2.0
A SCENE in the 2005 action film, Mr. and Mrs. Smith, shows Mr. Smith (Brad Pitt), a professional assassin, racing home in his black Cadillac CTS-V. He skids around a corner, and in the next shot suddenly he is in a Lincoln Town Car instead of the Cadillac. Huh? It turns out that a black Town Car appears later in the movie; evidently, footage of - Behind the Wheel column on 2008 Cadillac CTS; photos (M) - By EZRA DYER
Forget Waterloo: London Has a New Route to Paris
When it came to promoting the start on Wednesday of its new high-speed rail link between Paris and London, the train operator, Eurostar, took a gamble on French sensibilities. Oubliez Waterloo -- forget Waterloo -- declared a cheeky full-page advertisement that ran earlier in the week in Le Figaro, one of Frances most widely circulated - Eurostar has transferred London terminus of its high-speed rail link to Paris from Waterloo railway station to St Pancras, which has undergone three-year, $1.7 billion government-and-privately financed restoration; Eurostar took gamble on French sensibilities in promotion campaign, running French newspaper advertisement that urged Forget Waterloo; photos (M) - By JOHN F. BURNS
Recycling the Whole House
IF the idiosyncratic, 40s-era cottage Alice Keller bought in Shoreline, a small city just north of Seattle, had a style, it might be called classic teardown. The ceiling in one room was so low she couldnt stand up under it. A downstairs bathroom was so narrow she had to wiggle sideways to get to the toilet. None of the windows matched. It was - Article on rising interest in tearing down older homes and recycling and reusing materials in new ones; photos (M) - By KRISTINA SHEVORY
what movie is this!? kids movie, house got wrecked by wrecking ball, leprechaun or magical creature possibly?
Im really annoyed because I cant think of this movie.
All I remember was that there was a little boy who was the main character and something about a house almost (or did) getting torn down by a wrecking ball.
Answer: Sounds so familar the only movie I can think of is "A Simple Wish" and I can't remember hardly anything in it except that it's a girl not a boy. Sorry if that is of no help.
Category: Movies
Miley Cyrus NAKED In Wrecking Ball: See Her In Every Angle HERE ...
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I want to remove a tattoo & heard of "Wrecking Ball" has anyone tried that product,I like to know if it works?
I went to the (wrecking ball) website and read good yet negative comments about it,so now i like opinions/comments out of the website.I want to know before i decided to get Laser on it...Thank You
Answer: Wrecking Balm is a scam. Typically with that kind of product they offer the cream and a concealer both being very costly. The only way a cream could actually remove a tattoo would be to chemically burn it out. It's too deep for a cream to dissolve without ruining the skin above it. The ads for those creams usually have a disclaimer under the before and after saying "results not typical, results with cream and concealer". Pretty much the scam is sell a regular old cream and claim lies for it and sell a cover up that will conceal it.
Category: Tattoos
Explosion Levels 2 Buildings in New Jersey, Killing 1 and Injuring 4
A powerful explosion killed a construction worker and critically injured four others in a hardscrabble town in New Jersey yesterday as it leveled a nearly built home and an abandoned apartment building and sent a hurricane of fiery debris, splintered wood and shattered glass flying for blocks around. The blast -- apparently the fault of bumbling - Natural gas explosion levels two Irvington, NJ, buildings; construction worker Mario Goncalves is killed and four others are injured; one home was nearly built and other was abandoned apartment building; vagrants are suspected of having broken into new home to steal pipes for scrap and severing gas line; 36 surrounding homes are damaged; photos; maps (M) - Reporting was contributed by Alain Delaquérière, Elizabeth Dwoskin, Kareem Fahim, Richard G. Jones and Nate Schweber. - By ROBERT D. McFADDEN; Alain Delaquérière, Elizabeth Dwoskin, Kareem Fahim, Richard G. Jones and Nate Schweber contributed reporting.
CONNECTICUT; Saving History From the Wreckers
Fairfield County has lost some of its loveliest old homes because of the often-grotesque trend of razing older houses to replace them with McMansions. But what new owners gain in modern conveniences, residents lose in the abrupt change in the appearance of their neighborhoods and the loss of old, sometimes historic homes. Because it is so difficult - Editorial commends residents for helping to establish third historic district in Greenwich, Conn, and decries inability to form another one in Cos Cob
By how much has the gravitational potential energy of the ball changed?
A 1400kg Wrecking Ball hangs from a 12m -long cable. The ball is pulled back until the cable makes an angle of 30.0 degrees with the vertical.
By how much has the gravitational potential energy of the ball changed?
Answer: From the geometry of the situation, the 12 m-long cable forms the hypotenuse of a right triangle, with the longer of the other two sides of length 12 m * cos(30 deg), which is about 10.4 m. Thus, the ball has risen by 12 m - 10.4 m = 1.6 m.
The potential energy will have changed by m*g*h, which is 1400 kg * 9.8 m/s^2 * 1.6 m , or about 22000 J.
Category: Physics
Do your dogs go into wrecking ball mode?
I have a Basset Hound and this is very rare but once in a great while hell go into wrecking ball mode! Meanings he jumps around barks howls and jumps in my recliner and almost makes it fall over so I was just wondering what your dogs did? Oh plus after every time my chiweenie eats shell just start rolling all over the ground and starts biting people and stuff.
Answer: MacKenzie...
Well...and I'm sure everyone experiences this...my dogs get into the "Charge of the Light Brigade" mode (also known as "the zoomies"). When they do, I always accompany them with my vocal bugle as follows:
http://www.youtube.com/watch?v=Vna4AAC1bdE
Category: Dogs
Miley Cyrus - Wrecking Ball - YouTube
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How much to rent a wrecking ball?
Ive looked up a lot of demolition rental sites and cant manage to find anyone who supplies wrecking balls. Im only looking for pricing, not planning any demolition so dont worry about the details. Just a figure and preferably a source for that price. I found out many demo suppliers dont use balls anymore, does anyone still know of a place that does?
Answer: never been able to rent one could never insure. do not use anymore. not safe. take way to long to get building down. grapplers / shears can grap a chunk of building and put into truck or recycle piles. I would imagine some countries still use them. if still used around 4 grand delivery, $1200-$1500 hr to run. requires 3 people
Category: Maintenance & Repairs
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Does anyone remember an old video game with a wrecking ball?
Does anyone know the name of an old video game (maybe 20 years ago) where you controled a wrecking ball and destroyed buildings with it? It might have been for the Apple II/e.
Answer: I hate you! :) This question has been driving me nuts for the last 24 hours. Obviously, the two above answers are not correct. I seem to vaguely recall a game like that. There was a game for the Mac called Hard Hat but that was more or less a kids game where you basically worked construction, including the very important wrecking ball. There's games like Construction Destruction that are more recent, but I cannot for the life of me come up with the game that's in my head.
Now, perhaps I just made this game up, but from what I remember you had to choose the height of the wrecking ball and trajectory and then based on math the ball would swing and hit buildings. It was a side perspective game. Dang, I wish I could help you. I asked my best friend and avid Apple gamer like me from our youth and he doesn't recall it at all. And we spent a BUNCH of time playing Apple games, including the almost first and still classic Lemonade Stand.
I hope you find your answer. I'll keep digging and if I find something before this closes I'll edit this post.
Category: Video & Online Games