What Does the "p" in "1.25p r/s2" Mean?

  • Thread starter Thread starter amcavoy
  • Start date Start date
  • Tags Tags
    Mean
AI Thread Summary
The discussion centers on the meaning of "p" in the context of angular acceleration expressed as "1.25p r/s2." Initially, there is confusion about whether "p" could stand for pico or momentum, given the context of a rotating mass. However, it is later clarified that "p" actually represents pi (π), which is consistent with the notation used in other parts of the problem. The user expresses concern that this misunderstanding led to incorrect answers for subsequent questions. Ultimately, the clarification resolves the confusion regarding the notation used in the physics problem.
amcavoy
Messages
663
Reaction score
0
I have a question that says "the angular acceleration is 1.25p r/s2." What does the "p" mean?

Thanks.
 
Physics news on Phys.org
Could it be pico? It might help to know the context.
 
A small block of mass m = 0.400 kg is attached to a massless rod of length L = 1.00 m and rotated in a vertical circle with uniform angular acceleration 1.25p r/s2. Assume the mass starts from rest at the top of the circle and rotates clockwise.

...the questions follow after that (such as what is the angular speed at 2 sec), but when I answered them without regard to the "p," I got the answers wrong. This makes me think the "p" actually means something, I just don't know what.

Thanks again.
 
Could this be momentum? I don't know why it would be here, but that's the only thing I can think of...

Edit: Sorry about that. I found out it represented pi. I don't know why it was written only with a p in that particular question (since it was written as "pi" throughout the others), but that's how it goes.

Thanks again.
 
Last edited:
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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}...
Back
Top