Physics, 21.02.2020 22:30 MrConman8460
It is said that walking at a comfortable speed involves a pendulum-like motion of your legs. We want to see how good this claim is quantitatively.
(A) First we are going to predict your gait. The legs are not a SIMPLE pendulum, in that all the mass is not concentrated at your foot, but is distributed. For such a pendulum the period T is given by the equation T = 2π √(I/mgL) where I is the moment of inertia. m is the mass of the pendulum; L is its length. As you recall, for a uniform rod, I=1/3 mL 2 This is a tough estimation because you know your leg has more mass at the thigh than the ankles, but for the moment, it's going to be our best guess. Now m is not your whole mass, but the mass of your leg, which is typically about 5% of your m. So, with a ruler and a scale, make a PREDICTION of the period of your leg as it swings in a walking motion.
(B) CHECK your prediction! Time yourself (or do it with a friend, more fun) walking 20 steps. Now there's just one more little trick here. If you watch carefully, a "step" is only half a cycle, since the leg must then swing back. So 20 steps = 10 cycles. Take the time you measure for 20 steps, divide by 10, and see if you are any where near the prediction from part A. Note that because of your length of leg and weight, everybody can have a different answer to this question!
Answers: 3
Physics, 21.06.2019 17:10, seby77L
Aspecial electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop ride at an amusement park. the sensor measures the magnitude of the normal force that the seat exerts on a rider. the loop-the-loop ride is in the vertical plane and its radius is 23 m. sitting on the seat before the ride starts, a rider is level and stationary, and the electronic sensor reads 740 n. at the top of the loop, the rider is upside down and moving, and the sensor reads 370 n. what is the speed of the rider at the top of the loop?
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Physics, 21.06.2019 22:30, ceceshelby646
Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.
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Physics, 22.06.2019 09:10, kingdesto3481
Which lists the organs in the correct order as food passes from the mouth to anus?
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It is said that walking at a comfortable speed involves a pendulum-like motion of your legs. We want...
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