Posted by 50Cent
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
Posted by Linkinpark17UK
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.
Posted by Linkinpark17UK
I had a thought about the last one and the answer is 0.00093 metres but I'm probably wrong.
Posted by bavinski
linkin parks right.do ur own homework.well disguised tho.
bav
Posted by kimcheeboi
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!
Posted by 50Cent
i've been rumbled
worth a try...I've done most of them now neway.
Cheers
Twista
Posted by boto43
Its very easy but I dont have time to solve it right now.
Posted by 50Cent
its just about knowing what equations to apply to which questions.