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  • Derivation of velocity in nth Bohr orbit • Physics Forums
    The discussion focuses on deriving the expression for the electron's speed in the nth Bohr orbit, specifically addressing parts (a), (b), and (c) of a homework problem The key equations involved include the momentum equation mvr = hn 2π and the relationship between force and centripetal motion, m (v^2 r) = ke^2 r^2 The highest speed is confirmed to occur in the n = 1 orbit, with the speed
  • Why is velocity squared in the equation for kinetic energy?
    The discussion centers around the question of why kinetic energy is proportional to the square of velocity in the equation for kinetic energy Participants explore historical perspectives, mathematical reasoning, and the implications of this relationship in physics, touching on theoretical and conceptual aspects Some participants note that Newton proposed kinetic energy as proportional to
  • Centrifugal Compressor: Absolute Velocity Calculation
    The discussion revolves around calculating the absolute velocity of air at the outlet of a centrifugal compressor, focusing on the relationships between impeller diameter, RPM, and slip factor Participants explore the implications of these variables on flow velocity components, particularly the absolute flow angle and the radial component of velocity, within the context of turbomachinery
  • Does a rotating accelerometer moving linearly measure linear velocity . . .
    If you know the initial linear velocity and orientation, and keep track of the linear acceleration (accelerometer) and angular velocity (gyroscope), then you can calculate linear velocity by integration It's simple in theory, but tricky in practice, because small initial errors add up over time (drift)
  • Why is friction proportional to velocity? • Physics Forums
    The discussion revolves around the relationship between friction and velocity, particularly why friction is often modeled as being proportional to velocity in certain contexts Participants explore this concept within the framework of phenomenological equations, considering its applicability in various scenarios, including low-speed and high-speed interactions with fluids Some participants
  • Numerade
    Confusing speed with velocity, neglecting the directional component of velocity Overlooking that deceleration is still a form of acceleration (negative acceleration) Failing to correctly apply the vector nature of velocity and acceleration in problem-solving
  • Exit velocity through a nozzle: Bernoulli vs. Experience
    The discussion revolves around the exit velocity of fluid through a nozzle, comparing theoretical predictions from Bernoulli's equation with real-world experiences Participants explore the implications of nozzle diameter on exit speed, considering factors such as friction losses and flow conditions One participant states that according to Bernoulli's equation, the exit speed of fluid is
  • Why Does a Car Move at Constant Velocity Despite Equal Opposing Forces . . .
    The discussion remains unresolved regarding the initial confusion about the relationship between force, acceleration, and velocity Participants reference Newton's laws, but there are varying interpretations of how these laws apply to the scenario of a car moving at constant velocity against opposing forces
  • Torque Power: Understanding Angular Velocity - Physics Forums
    The discussion revolves around the relationship between torque, power, and angular velocity, particularly in the context of rotating systems Participants explore how torque can exist in systems with constant angular velocity and the implications of this on the understanding of power and friction
  • Velocity Ratio, mechanical advantage, Efficiency of a screw jack
    The Velocity Ratio is calculated as VR = 94 2 using a lead screw of 12 mm and a radius of 180 mm The Mechanical Advantage is determined to be 24 51, based on a load of 200 kg converted to Newtons





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