Recent content by JakePearson

  1. J

    Dynamics (Help me understand)

    i can appreciate you comment. But this is what i mean. This isnt sinking in. My lectures speak to me like this. Could you work through it with me. Cheers
  2. J

    Dynamics (Help me understand)

    hey guys, i'm in the middle for revising for a dynamics paper in January. I'm in the middle of a 1st year BSc Physics degree. Looking through some past papers, there are questions that i can do, and there are questions that i am unable to do. These are usually question where you have to derive...
  3. J

    Adiabatics with OTTO CYCLE

    hey guys, just wanted to know, in the graph of the OTTO cycle in the link http://www.qrg.northwestern.edu/ther...Pv-diagram.gif [Broken] are stage (2-3) and (1-4) adiabatic or not, if so why are they the reason i ask is that i have a graph showing that these stages are adiabatic...
  4. J

    Kinetic energy of bullets

    you have not converted the mass of the bullet from grams to kgrams 0.50 x (3.5x10^-3) x 42.4^2 = 3.14J this is the answer i got
  5. J

    Adiabatics with OTTO CYCLE

    hey guys, just wanted to know, in the graph of the OTTO cycle in the link http://www.qrg.northwestern.edu/thermo/design-library/otto/Otto-Pv-diagram.gif are stage (2-3) and (1-4) adiabatic or not, if so why are they the reason i ask is that i have a graph showing that these stages are...
  6. J

    Maxima question needs checking

    question a rectangular plot of land requires fencing on all 4 sides. two opposite sides will use heavy duty fencing at £6/metre, whilst the other tow sides will use standard fencing at £3/metre. if the farmer buying the fencing has £5000 to spend, what is the maximum area he can enclose...
  7. J

    Are these correct

    1) Differentiate x(t) = pi / t2 pi x(t) = t-2 = pi (t-2) = -2pi t-3 2) Differentiate x(t) = 1 / (At3 + B) = (At3 + B)-2 x (2At2) = (-2At2) / (At3 + B) 3) Differentiate x(t) = [A sqrt(t+B)]4 = [A (t+B)1/2]4 = A4(t + B)2 = 2A4(t + B) 4) The nebraska board of grain are...
  8. J

    Are my dimensional analysis question correct

    for; v2/3A i got an answer of = L4/3T-2/3 is this correct
  9. J

    Trig identity question need checking

    1. cos(2x+y) = cos(a+b) = sinasinb + cosacosb = (2x+y) = sin2xsiny + cos2xcosy = sin2x = 2sinxcosx and cos2x = cos2x-sin2x = cos(2x+y) = (cos2x-sin2x)cosy - (2sinxcosx and cos2x)siny (is this correct) 2. evaluate the following exactly (use \sqrt{} in your answer where necessary) cos...
  10. J

    Logarithms questions need checking

    1. ln (x2 / y2) = log (A / B) = logA-logB = logx2-logy2 = 2logx - 2logy (is this correct) 2. can this expression be split into seperate log functions and numbers, is this question the answer log(2x + 3y) = log(2x + 3y) (is this correct)
  11. J

    Dimensional analysis question

    given a distance s = 8.6m, time t = 2s, and a mass = 1.01kg, evaulate the expression to a physically appropriate accuracy? m3 = 1.013 = 3.03kg is this correct
  12. J

    Are my dimensional analysis question correct

    are these dimensional analysis questions correct A = area V = volume v = speed p = density 1. VA / v = L3 L2 L-1 T-1 = L4T-1 2. V2/3 A = (LT-1)2/3 L2 = L2/3 T-2/3 x L2 = L10/3T-2/3 3. 3A3 + 2V2 = A3 = L6 V2 = (L/T)2 = L2T-2 = L4T-2 are these correct
  13. J

    Is these algebraic expression correct

    1.(x - 3)2 = 4 x2 - 6x + 5 = 0 (x - 1)(x - 5) = 0 x = -1, -5 (is this correct) 2. 2x + 4 / x +1 = x - 8 / 2x - 1 (2x + 4)(2x - 1) = (x - 8)(x + 1 4x2 - 2x + 8x - 4 = x2 - 7x -8 4x2 - 6x - 4 = x2 - 7x - 8 (where do i go from here) 3. (x / 3) - (y / 2) = -1 (y / 2) = -4 - 3x 6x + y...
  14. J

    Is this algebraic expression correct

    a(a-6) + 9 = 0 a2 - 6a + 9 = 0 (a - 3)(a - 3) = 0 a = -3 is this correct
  15. J

    Is this subtraction correct

    a gas contains 2 kinds of atoms 4x105atoms of type A and 8x105 atoms of type B. it is known that the mass of type A atoms is 5x10-26kg and the mass of the gas is 2.8x10-20kg. what is the mass of type B atom? answer; 2.8x10-20kg - 5x10-26kg = 2.8x10-20kg - 0.00005x10-20 = 2.799995x10-20kg...
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