In some areas in northern Virginia the frequency of the black phase of the gray squirrel (Sciurus carolinensis) is 25%.  One thought is that the black coloration helps protect squirrels from predators (more difficult to see in shady areas).  You find that over the course of a year 23 out of 67 gray squirrels are caught by predators, whereas for black squirrels 13 out of 57 squirrels are caught by predators. What is the overall probability of any squirrel surviving? (Just FYI – not important for answering the question – black squirrels are the result of a single allele change – sort of like black leopards or black jaguars).

A steel rod with a circular cross section is used as a weight hanger. The straight part of the rod is 170-mm long and has a diameter of 4.4 mm. Determine the longitudinal strain in this portion of the rod when it supports a tensile load of 12.0 N.

Select all that apply. When is D2O used in NMR experiments?©GMU 2020

______ is a term used to describe crimes that go unreported.

A load of 15 kN is applied through a pin connection and a square bearing plate to the end of a beam that has a rectangular cross section. The base of the beam’s cross section is 74 mm and the height is 140 mm. The size of the bearing plate is 94 mm. Determine the bearing stress between the plate and the beam.

If μ = 37 and σ = 7, what is Pr{Y > 37} ? (Hint, you don’t need tables – draw a picture and you should have the answer right away).

Select all that apply. Why does the NMR need to be cooled to 4ºK?©GMU 2020

Before an automotive engine is started, its timing belt has a length of 43.00 in. and a temperature of 70°F. At the engine operating temperature of 210°F, it is determined that the belt has elongated to 43.04 in. What is the coefficient of thermal expansion of the belt?

Rigid pipe (2) is supported by a pin connection at C and tie rod (1). The structure supports a load P = 19 kN at pin B. Assume x1 = 3.2 m, x2 = 1.7 m, and y1 = 3.2 m. Determine the force in tie rod (1).

A short column is loaded in compression. Segment (1) has a solid cross section with a diameter of 1.00 in. Segment (2) is hollow with an outside diameter of 1.26 in. and a wall thickness of 0.13 in. If segment (2) has a normal stress of 10 ksi, determine the normal stress in segment (1).