2025年1月11日 · Does the v with the arrow underneath stand for velocity vector? If so, does the length of the arrow indicate the magnitude of the velocity? Is arrow length usually specific (x cm, or y mm, or whatever, indicating a specific magnitude, sometimes to scale)? Or is it usually relative (longer or...

2025年1月28日 · Fundamentally, velocity and position are unrelated. There is no physical law that says that if your ##x## position is ##x_0## then your velocity must be ##v_0##. You can be anywhere with any velocity. Cranking through the Euler-Lagrange equations as you did gets you to ##v=\mathrm{const}##, and still you can still have any velocity at any position.

2016年6月24日 · No it doesn't. You're mixing symbols with units, s is short for seconds. eg velocity is metres per second (m/s) In the kinematic equations (SUVAT) 's' is used to represent distance (which has units of metres) s is distance in metres (m) u is initial velocity in metres per second (m/s) v is final velocity in metres per second (m/s)

2025年2月5日 · The problem is literally to find the initial velocity. I suggest you work symbolically to find expressions involving the quantities given in the problem and the initial velocity. Preferably starting from the relevant equations that you did not write. (Please write out the equations you think are relevant).

2024年12月16日 · (1) this exceeds sonic velocity so the calculation should be done for compressible flow, the actual initial velocity will be lower (probably just over one-half of the 1256 ft/sec calculated above) (2) the volume in your 50 feet of tube is only 0.068 ft^3 so it will be drained in 0.04 seconds (this means that the details of the configuration ...

2016年8月28日 · If I'm not mistaken, the closing velocity is the velocity that the planes get closer to each other. And the closing speed is its magnitude, that is, the rate of change of the distance between the airplanes. If the planes are at positions $\mathbf p_1$ and $\mathbf p_2$ and have velocities $\mathbf v_1$ and $\mathbf v_2$, then the closing ...

2009年10月29日 · Problem: How long does it take to fall 1000ft with no drag? What is the final velocity? displacement: s=1000ft acceleration: a=9.8 (gravity) time: t=? Homework Equations s=v(bar) * t (distance = average rate * time) s=(1/2)at 2 (distance = one half * acceleration * time squared) v=at The Attempt at a Solution Step 1) Convert 1000ft to 304.8 m

2024年12月27日 · 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, I thought both of those were vector quantities, e.g; v (final velocity) 112km/hr North

2022年10月31日 · 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 the ratio between the viscous force and the shear rate. As long as viscous force and shear rate have a linear relationship, viscosity will have a single fixed value.

2013年8月24日 · I'm busy preparing for my upcoming physics final by going through some old papers. I came across this question and I honestly have no idea what to do. Here's the question: A β-particle was emitted with an energy of 5.7 x 103 eV. …