Exit velocity of a gas through a hole • Physics Forums
Sep 25, 2016 · The discussion centers on the relationship between the exit velocity of gas and the diameter of a hole in a pressurized container. Initially, it was suggested that the exit velocity …
Phase and group velocity for the wave function - Physics Forums
Jul 20, 2025 · Since the phase velocity is linear in , , the group velocity is an average of all the phase velocities in the wave pocket. This turns out true in the simplest case which wave …
Is velocity ever a scalar quantity? • Physics Forums
Dec 27, 2024 · Velocity is fundamentally a vector quantity, possessing both magnitude and direction, while speed is a scalar representing only magnitude. In the context of the SUVAT …
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 …
Can force be expressed as mass flow rate times velocity
Aug 1, 2015 · Force can indeed be expressed as mass flow rate times velocity, particularly in fluid dynamics scenarios like water flowing through a pipe or gas from a spray can. According to …
Why is the Velocity equal to joules per kilogram? - Physics Forums
Feb 8, 2017 · Homework Statement Calculating the rms speed of an N2 molecule. The units I end up with are J/kg and this is equivalent to Velocity. my question is why? Homework Equations v …
Addition of Velocities (Velocity Composition) in Special Relativity
May 20, 2024 · The “Addition of Velocities” formula (more correctly, the “Composition of Velocities” formula) in Special Relativity v A C c = v A B c + v B C c 1 + v A B c v B C c is a …
Finding distance traveled up a ramp given m, angle, and velocity
Sep 23, 2010 · A block with a mass of 18.4 kg slides down a ramp at a 43.5-degree angle with constant velocity, indicating zero net acceleration. The coefficient of kinetic friction was initially …
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 …
Find the pebble's position, velocity, and acceleration
Nov 28, 2007 · A tire rolls in a straight line without slipping. Its center moves with constant speed V. A small pebble lodged in the read of the tire touches the road at t = 0. Find the pebble's …