If a polymer is to be extruded at a high shear strain rate, which of the following material characteristics is most desirable?
(a) Shear thickening.
(b) Newtonian fluid.
(c) Shear thinning.
(d) Elastic.
(c) Shear thinning.
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In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the earth using a pendulum 11.0 m long, which was set up in the Paris Observatory
How long would it have taken for Foucault's pendulum to make one complete swing back to its starting point if g = 9.81 m/s2 at the observatory? A) 6.65 s B) 5.63 s C) 1.79 s D) 2.12 s E) 2.58 s
Why do some scientists think that Jupiter's existence may have been critical for life to evolve on Earth?
A) It prevented Earth from migrating outward and thus ensured a stable climate. B) It prevented Earth from migrating inward and thus ensured a stable climate. C) It kicked out many comets from the inner solar system through gravitational encounters, thus limiting the number of objects that could potentially hit the inner planets. D) Meteorites from Jupiter may contain bacteria that started life on Earth. E) It stabilized Earth's axis tilt and thus ensured a stable climate.
The rate at which work is done is equivalent to which of the following?
a. increase in potential energy b. thermal energy c. potential energy d. power
Three identical bar magnets, each 2 cm long, are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends. They are constrained so they cannot rotate, but they can slide along the straight line. The left magnet has its north pole nearest the north pole of the middle magnet, and the right magnet has its south pole toward the middle magnet's south pole. Once they are in place and released from rest, which of the following best describes the motion of the magnets?
a. The end magnets will move away from the center magnet. b. The magnets will not move since they are equally spaced. c. The magnets will snap together. d. None of the above would happen.