Is it jut me or is there an error in this example?

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The discussion centers on identifying potential typos in a given example. Participants agree that the value of 12 m/s is likely a typo, while the value of 50 may also be incorrect. There is a consensus that the repeated mention of 410 N could also indicate a typographical error. The conversation highlights the importance of accuracy in numerical values within examples. Overall, the participants conclude that the initial assumption of a typo is valid.
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Where did the 50 for the v value come from?
 
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It must be a typo.

ehild
 
More likely the 12 m/s was a typo, since 50 as a typo also means that the 410 N (stated twice) were also typos.
 
D H said:
More likely the 12 m/s was a typo, since 50 as a typo also means that the 410 N (stated twice) were also typos.

You are right, 12 was the typo :biggrin:

ehild
 
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
I was thinking using 2 purple mattress samples, and taping them together, I do want other ideas though, the main guidelines are; Must have a volume LESS than 1600 cubic centimeters, and CAN'T exceed 25 cm in ANY direction. Must be LESS than 1 kg. NO parachutes. NO glue or Tape can touch the egg. MUST be able to take egg out in less than 1 minute. Grade A large eggs will be used.
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