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  1. E

    Heat transfering issue

    yes actually the answer should take account both reasons..deltaT and the radiation emmissions which vary propotional to T^4 and that's a lot of difference with a small temperature change. and the surrounding temperature of the environment.
  2. E

    Ne1 know nething regarding kinetic friction

    where exactly is your attempt to the solution?
  3. E

    Equatorial Velocity

    try rotational velocity, or sun's rotation velocity...u'll find it
  4. E

    A force question

    ok wait i didn't pay attention that the acceleration is the force pulling after friction has been taken into account.sorry my bad
  5. E

    A force question

    First of all Weight x coeff. Friction, is right, but the weight ain't 1000Kg !!! it's mass x gravity remember ?? Btw if you draw a Free Body Diagram for your system u'll realize that u really misused the information given to you, for example not all the force exerted by car A is going to the...
  6. E

    Solar water heating tubes.

    have you tried some kind of solution?
  7. E

    Another Thermo Question

    for isentropic expansion and compression in ICEs we use the same principle u used to find the first 2 works. we use : W= (PoVo-PoVo/4)/(1-k) k=Cp/Cv. for isentropic adiabatic compression or expansion. How did u know the gas was monoatomic?
  8. E

    General Gravitational Potential Energy (Help)

    how do u calculate P.E with respect to two masses?
  9. E

    General Gravitational Potential Energy (Help)

    btw. both r pulling also in my example. the gravity of the earth is pulling and the rope is pulling opposite to it
  10. E

    General Gravitational Potential Energy (Help)

    u r considering potential !! don't forget. Lets reconsider u tied up by a rope from a building at 5m height. the rope is the gravity of the second star that's holding u from fallin back. but when i ask u what is ur P.E u say mgh and u take height that u r currently on and forget whether another...
  11. E

    Challenging Thermodynamics Problem

    what level is this question?
  12. E

    Weight in orbit?

    OMG now i see. it means that you and the scale are moving at the same gravitational pull thus no weight will be displayed.
  13. E

    Weight in orbit?

    that's because u have another acceleration that cancels the gravity factor,here the acceleration is equal to gravity of free fall this is why u feel weightless. try this what if the elevator was accelerating with a value A less than that of gravity, u'll feel difference in weight! but in space...
  14. E

    Weight in orbit?

    the upward motion is a reaction to ur weight ur exerting on the scale, which is gravity induced. in space gravity is less but u still have weight, thus u still might put tension on the spring !
  15. E

    Weight in orbit?

    my god !! wrong window again.. well what is cancelling the gravitational pull form the planet to the person in space? i meant rotational sorry..
  16. E

    Weight in orbit?

    sorry not rotational,. potential !! sorry misconcentration
  17. E

    Gravity's affect on the rebounce height of a tennis ball

    Here goes what i think: the higher the initial height, more friction then more losses due to heat before and on impact. More air resistance is encountered the higher u go, because ur lenghthening the time air resistance is beating on the ball then more losses are encountered. the deformation...
  18. E

    General Gravitational Potential Energy (Help)

    this confirms what i said in my second post ! the potential gravitational pull is only related to the pulling mass and the mass in question, no relation with the other mass, which in this case is the second star
  19. E

    General Gravitational Potential Energy (Help)

    can u explain more where the equation is wrong, and how to correct it?
  20. E

    General Gravitational Potential Energy (Help)

    wait a minute here,.isn't Potential energy the mass*gravitational pull*height? when i say gravitational pull i mean w.r.t the star its falling towards. shouldn't it be like the energy that this object will have if it started falling towards a certain star considering the other star was suddenly...
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    Weight in orbit?

    i have a question about this subject. r u assuming that the rotational gravitational pull is cancelling the gravitaional pull by Triton?
  22. E

    General Gravitational Potential Energy (Help)

    First calculate the gravitational pull between the shuttle and the star at x=0 this would be F1= -GM1m/r...then with the star at 10R_s, this would give F2=-GM2m/(10R_S-r).M1=M2, u can replace them by M. and since the forces are opposite each other u would have to substract them from each...
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    Elevator and Spring question

    Its very easy. take initial to be at the moment the cable snaps, where we only would have potential energy or mgh which u calclated to be 2.5x10^5 + mgy that would be Einitial. Efinal is after the spring compresses as much as it can, so that means the velocity2 is zero, and potential enery 2 is...
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