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A company wishes to enhance its image by replacing oil-based plastics in its products by polymers that are based on natural materials. Use CES EduPack to find information on biopolymers. List the materials you find and state their significant applications. Which materials biopolymers are made from? Describe a plastic product on the market made from a bio-polymer, including which bio-polymer it is made from.
The wire of a hoist has a cross sectional area of 80 mm2. The hoist is used to lift a crate weighing 500 kg. What is the stress in the cable? The free length of the cable is 3 m. How much will it extend if it is made of steel (modulus 200 GPa)? How much will it extend if it is made of polypropylene, PP (modulus 1.2 GPa)? (assume purely elastic deformations).
a full-revolution press has 100 rpm flywheel rotation. the press is equipped with two-hand palm buttons mounted on the
determine the maximum pressure across a 10 hp pump that has an inlet diameter of 1.0 inches and velocity of 10 fps. the
a seismic instrument has a natural frequency of 20 hz and a damping ratio of 0.65. determine the maximum input
an opaque horizontal plate is well insulated on the edges and the lower surface. the irradiation on the plate is 3000
a glass beaker with water is placed inside a bell jar and the jar is subjected to vacuum. the room temperature was
rod bde is partially guided by a roller at d which moves in a vertical track. knowing that the instant shown the
you are required to investigate the dynamic movement of a mass m sliding along a rod as shown in the diagram below. the
a piston-cylinder device with a set of stops on the top initially contains 3 kg of air at 200 kpa and 27 degrees
an air conditioner using r-134a as the working fluid and operating on the ideal vapor-compression refrigeration cycle
two materials a and b of the same density are being considered for the design of a large plate that is 2 m wide and 3 m
electric space heaters for home use commonly utilize a ceramic filament as the heating element. list the mechanical
a 98 kg log is being moved by placing it on two cylinders. when the log has a linear velocity of 2.76 ms a force
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