General Dynamics

The following is the top view of an assembly kept on a smooth horizontal table. A massless inextensible string of length D D lies with one end fixed, while the other is attached to one end of a uniform rod of length L L . The system is initially at rest with the rod aligned along the x x -axis and the string stretched to its natural length at an angle with the negative y y -axis θ \theta ( cos θ = 1 3 ) (\cos \theta= \frac{1}{3}) . At a certain instant, a bullet of the same mass m m as the rod and negligible dimensions is fired horizontally along the positive y y -direction. The bullet hits the rod at its right end with velocity v v and gets lodged in it, the impact being nearly instantaneous. What is the tension ( T ) (T) in the string immediately after the impact? Assume the string doesn’t break.
If your answer comes in the form of T = α m v β γ ( 1 δ D + 1 L ϕ ) T =\frac{\alpha mv^{\beta}}{\gamma} \bigg( \frac{1}{\delta D}+\frac{1}{L\sqrt{\phi}}\bigg)
Type your answer as α + β + γ + δ + ϕ \alpha +\beta+\gamma+\delta+\phi
Details and Assumptions
1) α , β , γ , δ , ϕ \alpha ,\beta,\gamma,\delta,\phi all are positive integer.
2) γ > 3 \gamma >3 it may help you.
The problem is not original.


The answer is 31.

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2 solutions

Dark Angel
May 13, 2020

Its me thanks for help

dark angel - 1 year ago

I posted it from another account

dark angel - 1 year ago

Ur a genius Only they can solve these

dark angel gaming - 1 year ago

got it correctly on my first attempt. my solution is quite long to latex. you should try my problems. nobody has solved my capacitor and pneumatic cylinder problem.

@Ramon Vicente Marquez Sir waiting for your solution. And I have seen your problems. They are awesome. I also don't able to solve the problem (capacitor and pneumatic cylinder) , but your solution is very good.

A Former Brilliant Member - 1 year, 1 month ago

@Ramon Vicente Marquez Please Sir post your solution. Thanks in advance

A Former Brilliant Member - 1 year, 1 month ago

I got it correct but it is not showing correct now it might be bug Ans(5mv^2)/(4)((1/18D)+(1/L√2) So im unable to post solution

dark angel - 1 year, 1 month ago

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@dark angel Are you using Brilliant app. Don't use brilliant through app. Go to website through chrome in your computer or mobile.

A Former Brilliant Member - 1 year, 1 month ago

Yeah ill post from different account

dark angel - 1 year, 1 month ago

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@dark angel in brilliant app I also encounter this problem that when a question is solved correct by you, after some time when you again go to the question it seems incorrect. This problem is not in brilliant website. So , use brilliant through website only.

A Former Brilliant Member - 1 year, 1 month ago

Can i know how to post solution on browser

dark angel - 1 year, 1 month ago

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@dark angel
1) Go to brilliant website through chrome.
2) Log in with your id and if you want to post solution, you have to login with another I'd as you know.
3) Using your mobile camera, click the solution's photo.
4) When you solve this question through your second Id correctly, brilliant will say you to upload your own explanation.
5) when you go in the green Arrow option Brilliant will open your gallery.and click on the solution photo which you want to post, after that brilliant will generate link of photo itself.
I hope you will definitely post your solution.



A Former Brilliant Member - 1 year, 1 month ago

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Thank u very much

dark angel - 1 year ago

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