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Which of the following actions is expected to increase the elastic modulus of a semicrystalline polymer? Select as many as appropriate. 1.increasing the volume fraction of crystalline phase (vs amorphous phase) 2.deformation by drawing (consider the elastic modulus parallel to the drawing direction) 3.annealing of undeformed material 4.annealing of material that has been deformed by drawing (consider the elastic modulus parallel to the drawing direction)
Three athletes are tugging on a ring. Martha pulls with a force of 150N in the northernly direction. How big is the resultant of the three forces
An airplane pilot wishes to fly to his destination 500 mi due west, but the wind is blowing at 21.5 mi/hr toward 18.9° north of west. what will be the speed of the plane relative to the ground
A 46.2 kg girl is standing on a 132 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the ice surface
A ranger in a national park is driving at 44 km/h when a deer jumps onto the road 70 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -3.00 m/s2.
A thick spherical shell of charge Q and uniform volume charge density ? is bounded by radii r1 and r2, where r2 > r1. With V = 0 at infinity, find the electric potential V as a function of the distance r from the center of the distribution, consid..
A physics professor is pushed up a ramp inclined upward at an angle 34.0 degrees above the horizontal as he sits in his desk chair that slides on frictionless rollers, Use the work-energy theorem to find his speed at the top of the ramp
An orienter runs the following course: 100 m at 35 degrees, 150 m at 220 degrees, and 50 meters at 170 degrees. find the resultant displacement.
Suppose that the coefficient of kinetic friction between Zak's feet and the floor, while wearing socks, is 0.250. what distance will he slide before stopping
In the absence of air resistance, a ballplayer tosses a ball straight up. By how much does the speed of the ball decrease each second while it is ascending
Using a 677-nm wavelength laser, you form the diffraction pattern of a 0.111-mm wide slit on a screen. How far is the screen located from the slit
Calculate the magnitude of the gravitational force exerted on a 429-kg satellite that is a distance of 2.91 times earth radii from the center of the earth. What is the magnitude of the earth's acceleration
Consider a fusion reaction in which two deuterium nuclei fuse to form a tritium nucleus and a proton, How much energy is released in this reaction
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