Recent content by Bhumble

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    Find the percentage uncertainty of a wooden block

    ΔV = V_measured - V_standard, V = V_standard etcetera for density You should have been given a standard, have to look one up, or incorrectly take an average of your results as a standard. I've never used this method for errors, except in several physics labs, and it always seemed kind of...
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    Einstein notion of time and the oscillation of the cesium atom

    I don't understand how an event does not have a speed (or more specifically a time dependence). I'm not sure how else would you describe an event other than some setting changing as a function of time? Assuming that you agree that an event does have a time dependence. Then doesn't it follow...
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    Einstein notion of time and the oscillation of the cesium atom

    @OP It seems intuitive for most people that there is an absolute or god's reference frame in which there is an infinitely fast transfer of information so that the appropriate time for all events can be recorded properly. This is likely because of how we are used to seeing this in our daily...
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    Newton's 1st Law: Object at Constant Speed, No Reaction Force

    Reference frame shouldn't matter because you still have potential energy from gravity between the book and presumably Earth or at least the table. Am I really missing something here? Seems to me like the only time this would ever be the case is in a closed system where we are ignoring potential...
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    Newton's 1st Law: Object at Constant Speed, No Reaction Force

    I'm not saying work must be performed just that there must be potential or kinetic energy for a force to be present.
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    Einstein notion of time and the oscillation of the cesium atom

    You seem to be ignoring the fact that speed is a function of position (magnitude only) over time. So any change in speed means that there was either a force exerted or something not quite right with perceived time. Einstein defined time as a part of a fourth dimension cT. An observers perception...
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    Newton's 1st Law: Object at Constant Speed, No Reaction Force

    ehild, I don't agree with your assertion that no energy is needed to produce a force. There is some potential or kinetic energy required for work to be performed and while it seems that there could be an ideal problem where there is a force with absolutely no motion that does not seem to be...
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    Where Does an Object Move in Space?

    Or are you referring to the discrete nature of energies and confusing this with the inability of a particle to stay at a location with not being able to move through it? Let's say there is some minimum movement for a particle based on a discrete energy that causes it to move some distance from...
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    Is polar attraction stronger than the repulsion of electrons?

    Approaching zero kelvin means that there is a large (approaching infinite) change in entropy with respect to a change in heat to the system. I perceive this to mean that there is a lack of micro states, even though this COULD be any constant I prefer to think that the discrete nature of energy...
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    Is Burnout Inevitable for Physics Students Pursuing Astrophysics Research?

    I just want to thank you for posting. I wish you the best of luck and had a similar experience in the latter years of college. I had never heard of imposter syndrome before but can honestly say that it describes my feelings/situation perfectly. I still experience these feelings but not anywhere...
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    Ampere Law in a hole Should give zero?

    It seems to me like you already answered your own question. "What is to be done is to add up both magnetic fields by superposition and therefore we indeed have the sum of the magnetic filed of the hole being ZERO, plus the magnetic field of the cable which is NOT zero at that point." You...
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    Calculating approx. Values in km3, m3, cubic miles, and gallons

    Yes your method is easier. I just couldn't get away from integration in my head so I pieced it out for the OP in not quite as eloquent manner as you did...
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    Time and air resistance question; throwing a ball upward.

    I hope you see (based on what multiple people here said) and even without dealing with the differential equations that you can intuitively know the answer just by recognizing that the direction of force due to air resistance is the same as gravity when the ball travels upward and in the opposite...
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    Time and air resistance question; throwing a ball upward.

    I'm guessing since air resistance is dependent on velocity that when throwing the ball upward since both air resistance and gravity are applying force in the same direction the ball will more quickly come to a stop however since when the ball is dropping the force due to air resistance is...
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    Power Source = I3 x 12 VPower Source = 7.38 W

    Assuming that you're analysis of resistors is correct (seemed like you had the right approach but I didn't double check), the equation you stated isn't correct because this is a current source not a voltage and your equation is mixing the two. This problem is to make sure you understand KCL. I_s...
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