A50 wt% ni–50 wt% cu alloy is slowly cooled from 1400°c (2550°f) to 1200°c (2190°f).
(a) at what temperature does the first solid phase form?
(b) what is the composition of this solid phase?
(c) at what temperature does the liquid solidify?
(d) what is the composition of this last remaining liquid phase?

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.