Recent content by Ofey

  1. O

    Ideal Gas Law and dimensional analysis

    Yes you have the right density. However, remember that the acceleration due to gravity has a different value on Venus, so you cannot you g=9.81 m/s^2. (Check the appropriate value from a book or wikipedia). I have no idea what a steel shell is. I assume that "steel shell" stands for a "steel...
  2. O

    What Magnetic Field Strength Keeps an Electron on a Straight Path?

    Forget qvB=(mv^2)/r. This equation describes an electron (or any other particle with a charge q) moving in a circular path, this is not true in your assignment. If a particle with the charge q is accelerated with the voltage U it will gain kinetic energy according to qU=\frac{1}{2}mv^2 From...
  3. O

    What Magnetic Field Strength Keeps an Electron on a Straight Path?

    If the electron travels in a straight line it doesn't accelerate upwards/downwards, which essentially means that the sum of all forces acting in the direction of the y-axis is zero. The magnetic force has to be equal, but opposite to that of the electric force.
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    Frequency of Harmonic Oscillator w/ Gravitational Force

    One question. In wikipedia it says: "If F* is the only force acting on the system, the system is called a simple harmonic oscillator" But F isn't the only force if gravity also acts on the system? *F=-kx In all proofs of harmonic motion gravity is neglected. I don't understand why we...
  5. O

    Frequency of Harmonic Oscillator w/ Gravitational Force

    I apologize for my english. The computer is placed on a horizontal plane which oscillates in the vertical direction.
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    Frequency of Harmonic Oscillator w/ Gravitational Force

    A computer used in space shuttles has to work during extreme circumstances. The computer has to work during an acceleration equivalent to 10G without breaking. The computer is tested by placing it on an oscillating horizontal plane. The amplitude of the oscillation is 0.10m. Determine the...
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    Frequency of Harmonic Oscillator w/ Gravitational Force

    The frequency of a harmonic oscillator is (as you know) f=\frac{1}{2\pi}\sqrt{\frac{k}{m}} I am wondering if this equation only applies for massless harmonic oscillators (or oscillators oscillating sideways)? The proof for the equation above is \sum {F=ma} -kx=ma...
  8. O

    Physics Final-Multiple Problems-Help

    Perhaps too late, but better late than never. In the first assignment. What is the momentum of the jumper when when the rope begins to tighten? Since you know that the jumper eventually stops moving at the bottom, you can solve the impulse. In the second assignment you will save a lot of work...
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    How Does Removing Pigs Affect the Decibel Level in a Pig Pen?

    You know the noise level and the total intensity. How can you, using the information you have, solve what intensity one of the 213 pigs has? Hint: Use the definition of decibel.
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    Ideal Gas Law and dimensional analysis

    What happens to a steel shell (with the specifications you mentioned), if dropped close to the surface of Venus? There are three options. It will just continue falling down after you've dropped it, until it hits the surface (assuming the surface is solid, I have no idea if it actually is)...
  11. O

    Ideal Gas Law and dimensional analysis

    You don't have to substitute M, since you can calculate a value for it. After all it says "carbon dioxide", which has a specific molar mass. Do you know how to calculate the molar mass for carbon dioxide?
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    Ideal Gas Law and dimensional analysis

    You (may) know that n=\frac{m}{M} where m is the mass, M is the molar mass and n is the number of moles. Try substituting this in the ideal gas law and solve for \frac{m}{V} which is the same thing as the density of the gas. Does this help?
  13. O

    What are the frequencies of the fundamental and first two overtones?

    Isn't it 0.00317/0.9 since it says that the whole string has the mass 3.17 grams?
  14. O

    What are the frequencies of the fundamental and first two overtones?

    I am not totally sure on this, but since it states that the whole string has a mass of 3.17 gram, doesn't that mean that the 60 cm has a smaller mass? If the answer is wrong it might be because of the wrong value on mass. EDIT: I didn't notice that this was exactly what Chewy said, I am sorry.
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