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Ahsome
 one year ago
Velocity Question
Ahsome
 one year ago
Velocity Question

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ahsome
 one year ago
Best ResponseYou've already chosen the best response.1The world record for fresh hen’s egg throwing is 96.90 m, set in 1981. Assuming no air resistance, what would have been the (a) throwing speed; (b) elevation angle; (c) maximum height; (d) time of flight?

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1I'm having some weird issues, where I am given too little information to solve...

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Let \(x\) be the total velocity \(x_h=x\times\cos\left(\theta\right)\) \(x_y=x\times\sin\left(\theta\right)\) \[t=\frac{96.90}{x\times\cos\left(\theta\right)}\] \[s_y=x_yt+\frac{1}{2}a_yt^2\] \[0=x\times\cos\left(\theta\right)\times\left(\frac{96.90}{x\times\cos\left(\theta\right)}\right)+\frac{1}{2}\times9.8\times\left(\frac{96.90}{x\times\cos\left(\theta\right)}\right)^2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0If the world record is set then the angle of elevation should be 45 degrees otherwise it would not have been a record

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Then why would they ask for elevation angle..?

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Whoops, thats meant to be \(x\times \sin\left(\theta\right)\)

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Any dieas @ganeshie8 @UnkleRhaukus ?

UnkleRhaukus
 one year ago
Best ResponseYou've already chosen the best response.1i also think it is justified to use 45° as the elevation angle

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1But I still don't know why they would ask it in the question... let me look at the solution

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Wow. The angle is 45 degrees in the book _

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Can you solve it without knowing the angle?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0its like common sense @Ahsome :P

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.1you cannot use common sense in physics

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1But I guess I'll just assume you had to assume the whole time..?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0any other ideas?? @nincompoop

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3dw:1434178782194:dw

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.1dw:1434178667144:dw

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.190 degrees would most likely not reach the distance horizontally

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.1dw:1434178899967:dw

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3For a given range, the max height could be "anything", so there is no unique answer. To get an unique answer we need to use a bit of common sense here that the given range is the world record (maximum possible for a given velocity)

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1The answer itself says the angle is 45 degrees

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.1dw:1434178985932:dw

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.145 degree angle is the optimal angle provided the same newton force is applied

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.1as the egg elevates gravity is pushing it down

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Then why would part of the question ask what is the angle...

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3They are testing if you know that the maximum is achieved when \(\theta = 45\) you may prove it if you want to..

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3You need to assume the starting speed is constant (all humans have more or less same throwing power) and vary only the angle and see which angle produces maximum range

nincompoop
 one year ago
Best ResponseYou've already chosen the best response.1correct, and that is determined by the velocity of the egg itself

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3\[R = \dfrac{v_0^2\sin(2\theta)}{g}\] what angle makes \(R\) large ?

ahsome
 one year ago
Best ResponseYou've already chosen the best response.145 degrees? Since \(45\times 2=90\) and \(sin(90)=1\)

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3Yep! maybe just put that for justification

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1Ahh, thanks @ganeshie8 and @nincompoop and everybody who helped :D

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.3np:) please medal divu.mkr not me

ahsome
 one year ago
Best ResponseYou've already chosen the best response.1If you say so @ganeshie8 ;)
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