Confusion on displacement question

AI Thread Summary
The discussion centers on a displacement calculation for a car moving east at 18 m/s for 5 minutes. The correct displacement is determined using the formula X = v * t, where time is converted to seconds, resulting in 5400 m. The initial confusion arose from an incorrect calculation of time, as 5 minutes equals 300 seconds, not 5. The teacher's answer of 5400 m is correct, and the direction should be included for completeness. The participant acknowledges their mistake and emphasizes the importance of unit conversion in physics problems.
ArcherofScience
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Homework Statement


A car moves east at 18 m/s for 5 minutes. What its displacement? It says that the answer
to this question from my teacher is: 5400 m.


Homework Equations


→ →
X= v *t

The Attempt at a Solution


→
V= 18 m/s [E]
t= 5 min.

→ → →
X= v *t = x= (18) (5)
→
X= 90 m/s [E]



am i wrong? or is my teacher's answer wrong? Because my teacher's answer does not include a direction and it seems impossible for that amount to be attained.
 
Physics news on Phys.org
5 minutes is 300 seconds. Watch units! Displacement has units of length.
 
oh man, how little was my mistake *facepalm* :frown:.

yeh it turned 5400 m, but I'm putting to the east to make the answer complete.

thanks for your help! :D
 
Thread 'Variable mass system : water sprayed into a moving container'

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}...
View full post »

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