For the polymer in Example problem 9.4, calculate the total strain after 30 days if the material is subject to a creep test with a constant stress of 3×107 Pa. Assume that this material behaves as a Maxwell solid and the viscous part of this material behaves as a Newtonian fluid.
What will be an ideal response?
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In the diagram below, which point indicates the location on the HR diagram of a one solar mass star when it undergoes helium flash?
a.
1
b.
2
c.
3
d.
4
e.
5
A object is 12 cm in front of a concave spherical mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 0.25 cm B) 15 cm C) 4.0 cm D) 2.4 cm E) 1.3 cm
A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object moving 6.0 m/s in a direction that is perpendicular to the initial direction of motion of the 1.0-kg object. The two masses remain together after the collision, and this composite object then collides with and sticks to a 3.0-kg object. After these collisions, the final composite (6.0-kg) object remains at rest. What was the speed of
the 3.0-kg object before the collisions? a. 15 m/s b. 10 m/s c. 5.0 m/s d. 20 m/s e. 25 m/s
A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
A) one-fourth as much. B) one-half as much. C) twice as much. D) four times as much. E) the same.