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Physics questions |
50Cent
Joined: Nov 08, 2003
Posts: > 500
From: ...whatever psycho!!!
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I need help from all you physics buffs out there....could u guys "guide" me in the right direction with these questions...
1.During a vertical jump, a person crouches down to lower her or his center and then leaps straight up. The leg muscles essentially do all the work, accelerating the body over a push-off distance of about 1/3 m. Typically, people can support an additional load using the legs equal to their own weight, but only with considerable effort. Let's suppose then that our person can push off with a muscle-force equal to 1.5 times body-weight. Neglecting losses due to friction, how high can our friend jump?
2.A 60 kg stuntperson runs off a cliff at 4.7 m/s and lands safely in the river 8.4 m below. What was the splashdown speed?
3.A 1450 kg car racing up a mountain road runs out of gas at a height of 33 m while traveling at 17 m/s. Cleverly, the driver shifts into neutral and coasts onward.
(a) Neglecting all friction losses, will the car clear the 80 m peak?
(YES/NO)
4.A single barrel of oil contains the equivalent chemical PE of about 9 109 J. How high in the air could that much energy raise a million kilogram load, assuming it is all converted to gravitational PE? [Hint: Use the definition of PEG assuming g is constant.]
g= 9.81
Thanks
Twista
Trusted Trader: 50Cent (+6, -0)
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Linkinpark17UK
Joined: Jan 27, 2002
Posts: 372
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Are you asking us to do your homework for you?
Its been a long time since I did physics so I doubt if I'm any help. |
Linkinpark17UK
Joined: Jan 27, 2002
Posts: 372
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I had a thought about the last one and the answer is 0.00093 metres but I'm probably wrong. |
bavinski
Joined: May 07, 2004
Posts: 18
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linkin parks right.do ur own homework.well disguised tho.
bav
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kimcheeboi
Joined: Dec 19, 2003
Posts: > 500
From: Abducted by hot blondes to Les
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Sorry i'd help you but i've got things to do...i think 2 is easy tho-horizontal speed will remain the same and splash down just factor in gravity. Good luck!
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50Cent
Joined: Nov 08, 2003
Posts: > 500
From: ...whatever psycho!!!
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i've been rumbled
worth a try...I've done most of them now neway.
Cheers
Twista
Trusted Trader: 50Cent (+6, -0)
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boto43
Joined: Nov 23, 2003
Posts: > 500
From: Trnava-Nitra,Pardubice CSSR
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Its very easy but I dont have time to solve it right now.
ja cejtim se bejt esatem sk podvedenej  |
50Cent
Joined: Nov 08, 2003
Posts: > 500
From: ...whatever psycho!!!
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its just about knowing what equations to apply to which questions.
Trusted Trader: 50Cent (+6, -0)
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Posted: 2004-05-07 16:29
