Relationship between viscosity and velocity in fluid mechanics
Oct 31, 2022 · The viscous force within a fluid will depend on the velocity gradient (aka shear rate) within the fluid. That does not mean that the viscosity is a function of velocity. Viscosity is …
Is velocity ever a scalar quantity? - Physics Forums
Dec 27, 2024 · I thought velocity was always a vector quantity, one with both magnitude and direction. When it came to the suvat equations, where v = final velocity, and u = initial velocity, …
Problem in understanding instantaneous velocity - Physics Forums
Jul 11, 2025 · The average velocity is the rate of change of position over a time interval, while the instantaneous velocity is the rate of change of position at a point in time. As a time interval …
Vertical circular motion minimum speed proof - Physics Forums
Nov 21, 2009 · hi, i've read in a lot of places that the minimum speed fora body to "finish" a vertical circle is (rg)^0.5, but I've never understood why.. they assume the...
Invariance of 4-velocity - Physics Forums
Jul 8, 2025 · The vacuum-speed-of-light is a scalar invariant under Lorentz transformations, while the 4-velocity is a 4-vector and is therefore not invariant (although the scalar product of two 4 …
Velocity of an Object Dropped from Height: Law Explained
May 5, 2005 · an increase in the height from which an object is dropped positively correlates with the final velocity of the object as it falls. It has more time to fall, so it will hit at a greater speed. …
Torque & Power: Understanding Angular Velocity - Physics Forums
Sep 9, 2008 · how can we say that torque is equal to power / angular velocity though we know that torque is equl to I x (change of angular velocity over time ). and how can we relate torque …
How to find the initial velocity given only angle and distance …
Sep 19, 2010 · Right so vertically final velocity is zero. We have the initial velocity as 27.586 m/s at an angle of 33°, so what is the vertical component of this velocity? We have 1) Final velocity …
Terminal Velocity from a graph - Physics Forums
Mar 16, 2006 · One would think that the ball bearing would reach terminal velocity almost immediately after entering the syrup, unless it was at a high temperature, in which case it will …
What is Velocity in Quantum Mechanics? - Physics Forums
Jul 16, 2010 · I want to know what does velocity really mean in quantum mechanics. Since the particle doesn’t have exact position, how can we talk about the velocity and momentum?