FYFD

Tag: physics

  • How Not to Get Wet in the Rain

    [original media no longer available]

    Ever wonder how to minimize how wet you get if you’re caught in the rain without an umbrella? This lecture discusses just that problem and how to calculate an answer. I actually solved a version of this problem when studying for my PhD quals, only I first had to determine the terminal velocity of a rain drop (~10 m/s assuming a 4mm spherical drop) and work from there. We also had to compare moving upright to running at an angle. It makes for an interesting little diversion. (via physicsphysics)

  • The ABCs of Physics

    The ABCs of Physics

    b=buoyancy is part of Ashley JM’s photo set The ABCs of Physics. In her words:

    Buoyancy is what causes less dense objects to float in a more dense fluid, such as a helium balloon in air. There is a buoyant force that pushes up on the object, equal to the weight of the displaced fluid.

    That little diagram up there is called a force diagram, they can be even more daunting than equations at times. This one shows that the buoyant force up on the balloon is equal to the force of tension in the string, this keeps the balloon in equilibrium.

    Be sure to look at the rest of her physics photos! # (via physicsphysics)