Recent content by Ockonal

  1. O

    How to calculate motor force from power?

    There is car, that has motor with power P. From power I can calculate motor work per time: A = P*\Delta t P - power, A-work, \Delta t - time interval. \Delta t and P are known (calculations are performing by discrete time steps). Now, I want to calculate force F, that will produce car's...
  2. O

    How Much Work is Required to Accelerate a Mass from 2 m/s to 60 m/s?

    Homework Statement What work needs to be done to change body speed with mass 6×10⁴ kg from 2 m/s to 60 m/s? Homework Equations A = mgh A = FS A = mv²/2 The Attempt at a Solution A₁ = mV₁² / 2 A₂ = mV₂² / 2 A_res = A₂ - A₁; A_res = m/2 × (V₁² - V₂²) A_res = 3×10⁴ × (4 -...
  3. O

    Calculating Freefall Acceleration on the Moon

    Sorry, I can't understand from where did you get GM/R² in g' = G(M/100) _______ R/4
  4. O

    Calculating Freefall Acceleration on the Moon

    Didn't understand right, maybe: g_moon = G × ( M_earth / 25 × R_earth² ) g_earth = G × ( M_earth / R_earth² ) g_moon / g_earth = M_eath × R_earth² ----------------------- = M_earth × 25 × R_earth² 1/25
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    Calculating Freefall Acceleration on the Moon

    As I understand: D/4 = Moon's diametr, so: R/4 + R/4 = D/4 So radius is smaller in 4 times?
  6. O

    Calculating Freefall Acceleration on the Moon

    D_moon = 1/4 D_Earth R_moon = (1/4 D_Earth)/2 I'm confused :(
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    Calculating Freefall Acceleration on the Moon

    so: g_moon / g_earth = M_moon × R_earth² ------------------- M_earth × R_moon² Now I'm passing data instead of *_moon: (M_earth/100) × R_earth² ---------------------- M_earth × (D_earth / 4) How to make it easier? ----- I did this: M_earth × R_earth²...
  8. O

    Calculating Freefall Acceleration on the Moon

    so: g_moon / g_earth = M_moon × R_earth² ------------------- M_earth × R_moon² Now I'm passing data instead of *_moon: (M_earth/100) × R_earth² ---------------------- M_earth × (D_earth / 4) How to make it easier?
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    Calculating Freefall Acceleration on the Moon

    Homework Statement Mass of the Moon is nearly less in 100 times than Earth's, and the diametr is less in 4 times. Find the acceleration of free falling at the Moon. Homework Equations F = G×((M×m)/R²) g = 9.8N The Attempt at a Solution M_moon = M_earth / 100 D_moon = D_earth / 4...
  10. O

    Is it possible for a balloon to rise up with an acceleration of 1 m/s²?

    Homework Statement A balloon which has weight 10.8 kN fall down with acceleration 1 m/s². What mass we have to pull of from balloon to make it(ballon) rise up with same acceleration. Homework Equations P = m×g P = m(g ± a) F =m×a P = 10.8 kN = 10.8×10³ N a = 1 m/s² g = 10 m/s² m₀ -...
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    Solving Inclined Plane Motion: Find Force for Acceleration

    Homework Statement There is inclined, smooth plane whish is sloped with angle 30 degrees. Some objects moves on it. The attraction power is 17 Newtons. Find the force which gives acceleration for the body. Homework Equations F = m×a; F_attraction = m×g; L = 30⁰; F_friction = u×N...
  12. O

    Steel pulling through ice, find weight of object

    Oh, if I understand you right: 0 = F - kN; 0 = N - mg; N = mg; 0 = F - kmg 0 = 2 - 0.02×k×10 k = 10; P = m×g; P = 10×10 = 100 (Newtons) And that is answer. Thanks, but did I understand right, there there woudnlt' be moving?
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    Steel pulling through ice, find weight of object

    But this way there shouldn't be any moving, should it?
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