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Calculate the amount of benzoyl peroxide (C6H5CO - O - O - OCC6H5) initiator required to produce 1 kg of polyethylene with an average molecular weight of 200,000 g/mol. Each benzoyl peroxide molecule produces two free radicals that are each capable of initiating a polyethylene chain. Assume that 20% of the initiator actually is effective and that all termination occurs by the combination mechanism.The polyethylene produced above is used to make a rope. The rope weighs 0.5 kg per meter. Calculate:i. the number of polyethylene chains in a 3-meter length of rope.ii. the total length of chains in the rope, assuming that the length of one repeat unit is 0.24495 nm.the percent crystallinity of the rope if the density of the rope is 0.92 g/cm3 and of the amorphous polyethylene is 0.87 g/cm3. Also, the density of fully crystalline polyethylene at room temperature is found to be equal to 0.993 g/cm3.Calculate the amount of benzoyl peroxide (C6H5CO - O - O - OCC6H5) initiator required to produce 1 kg of polyethylene with an average molecular weight of 200,000 g/mol. Each benzoyl peroxide molecule
A uranium atom is ionized seven times, losing seven electrons inthe process. Its resulting mass is 3.90×10−25 kgand it is given a kinetic energy of 3000 eV. If it circles ina magnetic field at a radius of 4.00 m, what is the strength of the magnetic ..
A bicyclist moves 400 ft north in 80 s, and then moves 300 ft east in 70 s. The magnitude of the average velocity of the bicyclist is most nearly? A rock is dropped from rest on a planet with no air resistance. It falls freely for 3.0 m in the first ..
Suppose a planet is discovered orbiting a distant star with 11 times the mass of the Earth and 1/11 its radius. How does the escape speed on this planet compare with that of the Earth
A square loop of wire is believed in a uniform 0.29 T magnetic field directed perpendicular to the plane of the loop. The length of every side of the square is decreasing at a constant rate of 5.8 cm/s. What emf is induced in the loop when the length..
A rod with an initial length of 4.67 m i heated from a temperature of 5 oC to 58 oC. What is the new total length of the rod
A motor running at 1500 revs/min has on its shaft three pulleys, of radii 6, 10 and 25 cm, respectively. Find the linear velocity of the outside rim of each pulley
A mass m slides without friction on a 1-dimensional track. The mass is moving from left to right with initial velocity v0. Determine the position where the mass will come to rest
a patient is going to be prescribed bifocals which will be 2.50 cm from the eye. the prescribed powers in diopters for
A hoodlum throws a stone vertically downward with an initial speed v0 from the roof of a building, a height h above the ground. How long does it take the stone to reach the ground
a helicopter is ascending vertically with a speed of 13.6 ms. at a height of 125 m above the earth a package is dropped
A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center of the disk. The platform has a radius of 2.75 m and a rotational inertia of 294 kg·m2 about the axis of rotation.
A cargo plane in flight lost a package because somebody forgot to close the rear cargo doors. You are on the team of safety experts trying to analyze what happened, Calculate the time at which the package fell off the back ramp
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