When drilling a well at constant angular velocity, the bottom end of the drill pipe encounters a torsional resistance ta. also, soil along the sides of the pipe creates a distributed frictional torque along its length, varying uniformly from zero at the surface b to ta at a. determine the minimum torque tb that must be applied by the drive unit to overcome the resisting torques, and calculate the maximum shear stress in the pipe. the pipe has an outer radius ro and an inner radius ri.
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Physics, 22.06.2019 01:10
The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2
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Physics, 22.06.2019 06:50
Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.
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Physics, 22.06.2019 20:00
Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?
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Physics, 23.06.2019 01:30
Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class
Answers: 3
When drilling a well at constant angular velocity, the bottom end of the drill pipe encounters a tor...
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