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hyperpathia    
疼痛性触觉过敏; 痛觉过敏

疼痛性触觉过敏; 痛觉过敏


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  • Why is kinetic energy 1 2 mv^2? - Physics Forums
    The discussion centers on the derivation of the kinetic energy formula, T = 1 2 mv^2, and the reasoning behind the 1 2 factor It explains that this factor arises from the Work-Energy theorem and is necessary for the change in kinetic energy to equal the work done on an object The historical context is provided, noting that earlier concepts like "vis viva" proposed m*v^2 without the 1 2
  • Kinetic energy of a rotating disc - Physics Forums
    Kinetic energy (KE) in a rotating disc is not uniformly distributed; parts of the disc further from the center move faster and thus have higher KE The correct way to assign kinetic energy to the whole disc involves using the moment of inertia (I) and angular velocity (ω), leading to the formula KE = 1 2 Iω² The moment of inertia for a solid disc is I = 1 2 MR², where M is the mass and R
  • How is momentum conserved if you lose kinetic energy?
    The energy component of KE is the velocity Momentum is mass x velocity so, in a collision containing in-elasticity, if KE is lost to heat then that heat energy must have been supplied by the velocity of the object
  • Calculating Kinetic Energy for an Object at an Angle
    To calculate kinetic energy for an object shot at an angle, the angle is not necessary if only the speed is required, as kinetic energy is a scalar quantity However, understanding the angle is crucial for determining the object's trajectory and velocity components In problems involving projectile motion, the angle can influence calculations related to height and direction, even if it doesn't
  • How Do You Calculate the Uncertainty in Kinetic Energy?
    The discussion focuses on calculating the kinetic energy of an object with mass and speed, including the uncertainty in that calculation The kinetic energy formula used is K = (1 2)mv², and the uncertainty is derived using propagation of errors
  • How is the formula Kinetic Energy=1 2mv^2 derived?
    The discussion focuses on the derivation of the kinetic energy formula, KE = 1 2 mv^2 It begins with a particle experiencing a constant force, leading to the relationship between velocity, acceleration, and displacement The derivation involves integrating the work done by the force over the particle's trajectory, resulting in the work-energy theorem Various methods are presented, including
  • Kinectic energy of a system of 2 objects • Physics Forums
    is it possible to find kinetic energy of a system of 2 objects when they're both moving at 2 different constant speeds? because In my textbook, they all assume that one stays at rest and another is moving
  • Bullet Penetration: Kinetic Energy vs Momentum - Physics Forums
    Kinetic energy and momentum are both crucial in assessing bullet penetration, but they serve different purposes Articles on dangerous game hunting often present conflicting information regarding the energy required for effective penetration, leading to confusion Factors such as bullet mass, shape, and velocity significantly influence penetration capabilities, making simplistic energy
  • Escape Velocity Question: Why is the final kinetic energy = 0?
    Final kinetic energy approaches zero as the object moves infinitely far from the planet, indicating that it will not return, while gravitational potential energy also approaches zero at infinity The escape velocity represents the threshold where an object's initial kinetic energy is sufficient to ensure it remains unbound from the planet
  • Calculating Kinetic Energy in English Units - Physics Forums
    Homework Statement An object has a mass of 10 lbm b Find the change in kinetic energy ft·lbf when its velocity decreases from 50 mph to 15 mph Homework Equations KE=1 2mv^2 Ke=(ft*lbf) 1MPH=1 4667 ft s The Attempt at a Solution When calculating this, does it need to be in slugs, lbm, or





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