An aluminum beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 60 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 16 mm
(C) 22 mm
(D) 26 mm
(C) 22 mm
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Equilibrium: A uniform 1200-N piece of medical apparatus that is 3.5 m long is suspended horizontally by two vertical wires at its ends. A small but dense 550-N weight is placed on the apparatus 2.0 m from one end, as shown in the figure. What are the tensions, A and B, in the two wires?
A. A = 880 N, B = 880 N B. A = 840 N, B = 910 N C. A = 9000 N, B = 8200 N D. A = 910 N, B = 840 N E. A = 8200 N, B = 9000 N
Suppose you find an X-ray binary that exhibits X-ray bursts. Is it possible that the system's X-ray binary consists of a red giant and a black hole? Why or why not?
What will be an ideal response?
A 24.0-kg crate, initially at rest, slides down a ramp 4.0 m long and inclined at an angle of 20° with the horizontal. If there is no friction between ramp surface and crate, what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s2)
a. 880 J b. 940 J c. 644 J d. 322 J e. 161 J
The fuel that provides most of the electricity in the U.S. is ________
a. oil b. natural gas c. coal d. uranium e. solar