Which of the following procedures would not be expected to increase the yield strength of LDPE?
(a) Quenching the LDPE to room temperature from the liquid state
(b) Increasing the crystallinity
(c) Increasing the molecular mass
(d) Decreasing the side branching
(a) Quenching the LDPE to room temperature from the liquid state
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A light aircraft that weighs 1,600 N is accelerated at 8 m/s/s for 15 seconds. The work done on the aircraft is _________
Fill in the blank(s) with correct word
A body of permeable rock through which groundwater moves is called
a. an aquifer. b. a water table. c. a porosity level. d. a zone of aeration.
Projectile Motion: A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down. Which of the following statements about the rock's motion are true just before it hits the ground? (There could be more than one correct choice.)
A. Its horizontal velocity component is zero. B. Its velocity is vertical. C. Its vertical velocity component is the same as it was just as it was launched. D. Its horizontal velocity component is the same as it was just as it was launched. E. Its speed is the same as it was just as it was launched.
A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive spaceship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is
A) still zero. B) non-zero, directed toward the spaceship. C) non-zero, directed away from the spaceship.