Recent content by kjamha

  1. K

    B Exploring the Relationship Between Mass and Matter in Particle Physics

    I think that I am beginning to see this and I am trying to develop a better sense of what is happening with the relationship between matter and mass and at the same time, get a better understanding of what mass is. I start to think that mass is not a property of matter, and that matter is a...
  2. K

    B Exploring the Relationship Between Mass and Matter in Particle Physics

    Would you consider mass and matter as separate entities? I did a little more digging and read an article about the big bang and the higgs field. I'm not sure it was correct, but it said that in the first few moments of the big bang, matter did not have mass. Because it's the big bang, all...
  3. K

    B Exploring the Relationship Between Mass and Matter in Particle Physics

    I searched through previous posts, but did not see this question posted - but I was wondering if mass and matter are different entities. I was reading a book that said something to the effect "if this entire paper clip was converted to energy using E=mc2"... but can a proton (what I see as...
  4. K

    B Big Bang & Size of Universe: Exploring the Unknown

    If the universe is infinitely large, has it always been so? If space and time did not exist outside the big bang, was the universe at the time of the big bang infinitely large? Does this suggest the vacuum of space was infinitely large and the big bang is expanding within it?
  5. K

    Work Kinetic energy using variable force

    ok - I read it quickly and thought it said relevant questions.
  6. K

    Work Kinetic energy using variable force

    taking the derivative, I would get acceleration = 24t if F = 0, then 0 = 24t and t would have to be 0 find the velocity at time 0 12(t)^2 - 6 = -6 is the answer -6 m/s?
  7. K

    Work Kinetic energy using variable force

    Are you asking for the acceleration?
  8. K

    Work Kinetic energy using variable force

    Homework Statement The position of an object of mass 2 kg is changing as a function of time by the formula x(t) = 4t^3-6t. (a) find the work done by the forces acting on the particle between t=1 and t=3s. (b) What is the object's velocity when the force on it is zero? Homework Equations is...
  9. K

    Confusion about work done by friction as negative or positive

    Your equation makes sense to me. Plugging in numbers for P0=K1+K2-Wf (using g = 10m/s2): 96 = 4v2 + 2v2 - 0.03x40x1.2 96 + 14.4 = 6v2 v = 4.29 m/s If friction is eliminated...
  10. K

    Confusion about work done by friction as negative or positive

    https://lh3.googleusercontent.com/0GOyZeQMdpLgYxYwwP4FMabe-Mk7QpADPC4ZK4PVpBGKvamcqjopOf3M0evdhE8PHZ3iTQ=s138 m1 is 4 kg and m2 is 8 kg. The kinetic friction coefficient on the table is 0.3. m1 is held in place. When m1 is released, m2 accelerates 1.2 m to the floor. Use conservation of...
  11. K

    I Question on convention - R vs r using universal law of grav.

    I have a question on convention regarding the universal law of gravitation formula. Sometimes the distance is represented with the lowercase r and sometimes with the uppercase R. Why is it listed two different ways? I am thinking that r is the total distance and R is the radial distance, no...
  12. K

    What doe it mean that energy is quantized?

    Just to double check my understanding... The two above quotes do not contradict each other. The first quote is referring to multiple systems (various black bodies) and the second quote is referring to a single system (a single black body).
  13. K

    What doe it mean that energy is quantized?

    The smallest amount of energy possible is called quantum of energy and is = hf. But are frequencies also quantized? or are they continuous. If frequencies are continuous, then energy can be continuous, no? I am thinking that Planck's constant would mean each frequency has its own quantum...
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