Who doesn't love a good espresso? But as I'm sure every great barista knows, the real key is all about permeability...As every great barista also knows, the ideal espresso shot (double, of course) is 60 ml, extracted at a brewing temperature of 94 degree C and a pressure of 9 bars, and takes 26 seconds to "pull". The standard diameter of the brewhead (and therefore of the coffee "puck" through which the water flows) is 58 mm. The "puck" is typically 7/8" thick. (A) What are the hydraulic conductivity and permeability of the ideal espresso puck? Be mindful that fluid properties (density and viscosity) are dependent on temperature, so you'll need to do some digging for the right values. (B) In the case of the overzealous home barista, a common mistake is to grind the coffee too coarse or too fine. Suppose all of the above parameters are the same, except that the result is a measly 25 ml espresso shot that takes 57 seconds to produce. What's the permeability of that puck 13 pts, and what should be changed to fix the problem?

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

The dot diagram represents the motion of the motorcycle as it moves from left to right

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?