Recent content by indietro

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    What are the differences between h and d in pressure/fluid concepts?

    yes, that was very helpful thank you!
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    What are the differences between h and d in pressure/fluid concepts?

    Homework Statement so i just had some questions: 1. is there a difference between h and d? sometimes i see P = \rhogh and other times P = \rhogd is there a difference? because if d=depth while h=height, would d always be a neg number? 2. for hydrostatic pressure, i was taught: P = Patm...
  3. I

    Pressure on a window of a submarine

    i really just can't seem to wrap my head around pressure concepts, if someone knows how to explain it clearly or knows a website where i can see examples and stuff that would be great!
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    Pressure on a window of a submarine

    anyone??
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    Pressure on a window of a submarine

    ok so i solved it with the help of a different post but i had a question: she does p' = p1 + \rhogd p' - p1 = \rhogd and then she says that p1 = 1x105 Pa > atmospheric pressure. I was just wondering why? can someone explain how \Deltap = p1 - po relates or is used in conjunction with...
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    Pressure on a window of a submarine

    Homework Statement a research submarine has a 20 cm diameter window 8 cm think. the manufacturer says the window van withstand forces up to 1x106N. What is the submarine's maximum safe depth? Homework Equations p = po + \rhogd The Attempt at a Solution p = F/A = 1X106 / 0.03 =...
  7. I

    Simple Harmonic Motion, Velocity at a certain time

    so to get the right answer i had to add the negative value i got for the time to the period. T = 2\pi / \omega = 0.41888 T + t = 0.0195 s ** and this is the right answer But can someone explain why I had to add it to one cycle (one period) ??
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    Simple Harmonic Motion, Velocity at a certain time

    can some one just confirm my algebra, because I am pretty sure it is just a calculation error...? greatly appreciated thanks!
  9. I

    Kinetic Energy of an arrow problem

    I think i would approach this problem as a conservation of momentum rather than kinetic energy. Pi = Pf marvi ar + m apvi ap = marvf ar + m apvf ap so you know the mass of the apple, both initial and final velocities of the arrow as well as both initial and final velocities of the apple...
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    Kinetic Energy of an arrow problem

    i think i would approach this questions as a conservation of momentum problem rather than
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    Simple Harmonic Motion, Velocity at a certain time

    Homework Statement The velocity of an object in simple harmonic motion is given by v(t)= -(0.347 m/s)sin(15.0t + 2.00π), where t is in seconds. What is the first time after t=0.00 s at which the velocity is -0.100 m/s? Homework Equations The Attempt at a Solution -0.1 = -(0.347)sin(15t...
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    Calculating Work: Piano Lowering 5m, 2500N Gravity, T1 1830N, T2 1295N

    oh yes thank you! i was using an angle that gave the component perpendicular to motion :)
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    Calculating Work: Piano Lowering 5m, 2500N Gravity, T1 1830N, T2 1295N

    Homework Statement There is a piano that is being lowered 5 m. It has gravity force acting in y-direction (down) of 2500 N. Then it has two ropes attached, they are vectors that are pointing up and out. so T1 is 1830N [W60\circN] and T2 is 1295N [E45\circN] Homework Equations so the work...
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    Conservation of Momentum in an Explosion Problem

    ok i was thinking about this all wrong.. i had assumed that since it was at rest it would be sitting on a table or the floor so all the pieces would fly out (semi-circle-type) and none would fly out in the negative y-direction. THANK YOU for all your help!
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    Conservation of Momentum in an Explosion Problem

    OH! i hadnt understood that. so is it always true that in an explosion problem the momentum of the piece(s) flying in positive direction will equal the momentum of the piece(s) flying in negative direction?