kinetic energy

  1. S

    Energy Definition

    Let's say one gallon of fuel can make a spaceship rocket engine with a mass M to run for 1 hour and to create a constant acceleration A. If we will use the full gallon starting from zero velocity, we will reach a velocity of A*1=V, the kinetic energy of the spaceship then will be Ek=0.5MV^2 . We...
  2. L

    Expression of power

    Power is defined by P=W/t where W is work done and t is the time. If force F is constant, then power can also be P=Fv where v is the velocity, which sort of can be derived from P=W/t=Fs/t=Fv. Since F=ma, also P=mav..........(1) However, if work done is turned into kinetic energy, E=(1/2)mv^2...
  3. S

    Diatomic Molecules

    In this problem we will use our knowledge of translational, rotational and simple har- monic motion as well as statistical physics to understand the behavior of a gas of diatomic molecules. (H2, O2, N2 etc.) A simplified model of a diatomic molecule consists of two atoms. The interaction...
  4. S

    My Case of Total Translational Kinetic Energy of Ideal Gas

    I have really problem with equation of the root – mean – square (rms) speed of the gas molecules when we use the universal gas constant (R) mentioned in all references. Accordance to all reference books, we have below equation for the total translational kinetic energy: Vrms = (3RT/ M)^0.5...
  5. B

    Kinetic Enery of a Spring?

    A cart attached to a spring vibrates with amplitude A. What fraction of the total energy of the cart-spring system is kinetic energy when the cart is at position x=A/2.0? K/(Utotal) = ? Express your answer using two significant figures. I have figured that the maximum kinetic energy...
  6. T

    Rotational Kinematics/ Kinetic Energy Problem

    Question: A cylinder of inertia 1.167 kgmm rotates about a vertical frictionless axle with angular velocity 32 radians/second. A second cylinder of inertia 1.6 kgmm is initially not rotating and it drops onto the first cylinder. The two surfaces are rough and they eventually come to the same...
  7. K

    billiards, kinetic energy

    Hello, i an new and i need help with two questions. 1) In billiards(pool), is it possible for the cue ball, when struck, to stop and transfer all the momentum to the ball it hit? If yes, why does it stop?? 2) Calculate the kinetic energy of Staten Island ( a city in new york) and compare it to...
  8. joepinsley

    Mechanics Problem

    Three stars, each with the mass of our sun, form an equilateral triangle with sides 3.8x10^12 m long. The triangle has to rotate, because otherwise the stars would crash together in the center. What is the period of rotation? Give your answer in years. Try conservation energy/momentum or forces...