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here is a physics

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here is a physics

Post  alphappy on Thu Apr 25, 2013 7:47 pm

This has absolutely nothing to do with anything ever, but I just want to share the most bizarre problem I have ever seen...
A pendulum swinging on a rocket accelerating in outer space, beyond significant gravitational influence from any celestial body, has a length of 10.0 cm and a period of 0.400 s. What is the acceleration of the rocket?
I just think it's really odd that they tell about the pendulum, then ask about the rocket.

p.s. yes I've figured it out.
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Re: here is a physics

Post  Red Hawk One on Thu Apr 25, 2013 8:49 pm

Outer space implies no external forces, assume cord is rigid.

Assuming the rocket is orbiting the central point:
cord length and period give you tangential velocity, use a(cent) = v^2/r to calculate centripetal acceleration. Rocket can be assumed to have accelerated rocket to this velocity but is otherwise negligible.

Assuming it's rocking like a pendulum
same thing as any other pendulum problem, just replace 'g' with an arbitrary rocket acceleration that fits the cord parameters. Rocket is a framing device to explain the arbitrary acceleration.

I've seen weirder (momentum balance with snowballs wars on frictionless sleds, anyone)?
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