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For a short time the 250 kg roller coaster car is traveling along the spiral track such that its position measured from the top of the track has a component r=8m theta=(0.1t + 0.5)rad z=(-0.2t)m were t is in seconds. Determine the magnitude of the components of force which the track exerts on the car in r, theta, andz direction when the time instant t=2s. Neglect the size of the car.
consider the following states of biaxel stress 1 sigma1 30 sigma2 0. 2 sigma1 30 sigma2 -15
determine the time it takes for the ball to start rolling without slip and its speed when it does so. In addition, determine the distance it travels before it starts rolling without slip. Assume (mu)K = 0.10.
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air at 100 lbf in 2 500 degree f and a velocity of 100 ft s enters a nozzle operating at steady state and expands
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