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valedictorian    音标拼音: [v,æləd,ɪkt'ɔriən]
n. 致告别辞者

致告别辞者

valedictorian
n 1: the student with the best grades who usually delivers the
valedictory address at commencement [synonym: {valedictorian},
{valedictory speaker}]


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  • Does Potential Energy = 0 at Earth Centre? • Physics Forums
    The discussion revolves around the concept of gravitational potential energy at the center of a perfectly round Earth with uniform density Participants explore whether the potential energy can be considered zero at this point, the implications of reference points, and the nature of gravitational potential in relation to work done Some participants suggest that gravitational potential energy
  • Gaussian - What exactly does the second derivative of the PES represent
    The discussion revolves around the interpretation of the second derivative of the potential energy surface (PES) in the context of molecular structures, particularly in computational chemistry Participants explore the implications of first and second derivatives in relation to molecular stability, optimization, and vibrational frequencies One participant describes the potential energy
  • What exactly does the second derivative represent - Physics Forums
    The first derivative of this potential energy surface is called the "force" which makes sense to me because the y-axis represents the potential energy so when the molecule is in a stable conformation, the force which would ordinarily push the molecule into a stable conformation (if it was in an unstable one) is 0
  • Why is electric potential present inside a conductor?
    A participant reiterates their reasoning about the electric potential, explaining that as a test charge approaches the conductor, its potential energy increases until it reaches the surface, and then remains constant once inside Another participant expresses uncertainty about the question and hopes for further input from others
  • What is the electric potential for a cylinder with uniformly . . .
    The discussion revolves around two physics problems: one involving the collision dynamics of an alpha particle with a lead nucleus, and the other concerning the electric potential of a uniformly charged hollow cylinder Participants are exploring concepts related to electric potential energy, angular momentum, and electric fields Participants are attempting to relate potential energy to
  • Electric Potential inside an insulating sphere - Physics Forums
    The discussion revolves around calculating the electric potential inside an insulating sphere, specifically addressing the potential at a point within the sphere compared to its surface The original poster attempts to derive the potential using Gauss' Law and the relationship between electric field and potential difference Participants discuss the integration process for calculating
  • Pulley Problem on an Inclined Surface Using Energy Methods
    The discussion revolves around a problem involving a particle on an inclined plane connected to another particle hanging freely The original poster is attempting to calculate the distance traveled by particle A after the string snaps, using energy methods The problem includes parameters such as mass, friction, and angles, and references a discrepancy between their calculations and a textbook
  • Why does the potential energy get lower as atoms get closer?
    A participant draws an analogy between atomic interactions and gravitational potential energy, suggesting that potential energy decreases as atoms approach and is converted to kinetic energy, but this is challenged by another participant who points out the weakness of gravitational forces at atomic scales
  • Potential Energy and Velocity of a Spaceship - Physics Forums
    The discussion focuses on calculating the potential energy and velocity of a spaceship traveling from Earth to the Moon The minimum speed required to reach the Moon is established as vmin = 11068 m s, while an initial attempt at v = 5534 m s results in a distance of 8 44 x 10 6 meters from the Earth's center The key equations utilized include the conservation of energy principle, ΔE = 0
  • What does negative potential energy mean? • Physics Forums
    The discussion revolves around the concept of negative potential energy, particularly in the context of gravitational potential energy Participants explore the implications of negative values in potential energy equations and the significance of reference levels in defining potential energy





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