A simply supported steel beam of length L 5 1.5 m and rectangular cross section (h 5 75 mm, b 5 20 mm) carries a uniform load of q 5 48 kN/m that includes its own weight. The maximum transverse shear stress on the cross section at 0.25 m from the left support is approximately:
(A) 20 MPa
(B) 24 MPa
(C) 30 MPa
(D) 36 MPa
(B) 24 MPa
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A. 30
B. 35
C. -40
D. 45
E. -30
An object undergoing free fall experiences
A. an increase in both its acceleration and velocity B. a decrease in its acceleration and an increase in its velocity C. a constant acceleration and an increase in its velocity.
Which forces have physicists shown to be the same force under conditions of very high temperature or energy, as confirmed by experiments in particle accelerators?
A) gravity and the weak force B) gravity and the strong force C) the strong and weak forces D) the strong and electromagnetic forces E) the electromagnetic and weak forces
What is a compound?
A) a group of molecules B) a molecule containing hydrogen C) a molecule containing two or more elements D) an ionized molecule E) a molecule containing carbon