Recent content by amcelroy13

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    Programs Will my medical degree make a difference?

    Almost all physics graduate programs in the US require at least one semester of quantum, E&M, and often times, depending on the program, either thermal/statistical/classical or all three for the top notch school. You also will most likely have to take the Physics GRE, a test that even people who...
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    Basic S.T.R. problem. K vs K' systems.

    Homework Statement An event occurs in system K' at x' = 2 m, y' = 3.5 m, z' = 3.5 m, and t' = 0. System K' and K have their axes coincident at t = t' = 0, and system K' travels along the x-axis of system K with a speed 0.92c. What are the coordinates of the event in system K...
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    Programs Which Major is Better: Chemistry or Physics?

    "I'm sure every chemistry major has done the electrolysis of water into hydrogen and oxygen." This is actually not a very common experiment. In fact, there are still entire labs devoted to this system in an attempt to turn it into a viable energy source. As far as physics vs chemistry...
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    Pluto's Atmosphere: Estimating Temp

    No, I've never seen that before. I feel as though it's supposed to be easier than that. THe answer is supposedly 108K, but I'm not sure how to get it at all.
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    Pluto's Atmosphere: Estimating Temp

    Homework Statement In 1988 telescopes viewed Pluto as it crossed in front of a distant star. As the star emerged from behind the planet, light from the star was slightly dimmed as it went through Pluto's atmosphere. The observations indicated that the atmospheric density at a height of 50 km...
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    Moment of Inertia problem with multiple masses

    Ya, the shape is kinda strange, turns out my calculator was almost out of batteries so it kept giving me wrong answers. I had no idea that could happen. however, the next part is proving extremely difficult for me. This is the actual, complete question: A string is wrapped around a uniform...
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    Moment of Inertia problem with multiple masses

    Homework Statement A string is wrapped around a uniform disk of mass M = 2.5 kg and radius R = 0.04 m. Attached to the disk are four low-mass rods of radius b = 0.09 m, each with a small mass m = 0.6 kg at the end in an "x" configuration through the center of the disc. What is the moment of...
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    Optimization and related rates trig.

    I figured it out, thanks for the help
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    Optimization and related rates trig.

    as of now i have gotten: time=((r(pi-2theta)/2)+r*2theta/4 r=2 so i have: time = pi-(pi*theta)+2pi I have no idea how to optimize... any help?
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    Optimization and related rates trig.

    never mind, that was dumb, its not a right triangle, BC would be r*(pi-2theta)
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    Optimization and related rates trig.

    so if arc AB = r*2theta (i think) would BC = 2/sin(pi-2theta)?
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    Optimization and related rates trig.

    Homework Statement A woman at point A on the shore of a circular lake with radius 2 miles wants to arrive at point C diametrically opposite A on the shore of the lake in the shortest time possible. She can walk at 4 mph and row a boat at 2 mph. To what point on the shore of the lake should...
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