A pinned-end copper strut (E 5 110 GPa) with length L 5 1.6 m is constructed of circular tubing with outside diameter d 5 38 mm. The strut must resist an axial load P 5 14 kN with a factor of safety of 2.0 with respect to the critical load. The required thickness t of the tube is approximately:
(A) 2.75 mm
(B) 3.15 mm
(C) 3.89 mm
(D) 4.33 mm
(D) 4.33 mm
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This frame from Figure 16.12 is from a supercomputer model of the formation of one of the first stars in the universe. Color indicates gas temperature: Blue and green represent cool gas (100—300 K), orange and red represent warm gas (500—3000 K), and yellow represents gas at intermediate temperatures (300—500 K). Use the information in the figure to answer the following questions.
According to the principle of equivalence, acceleration is equivalent to
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A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
a. ?14 J b. ?12 J c. ?10 J d. ?16 J e. ?25 J
An object is 50 cm from a concave mirror of radius of curvature of magnitude 60 cm. How far is the image from the mirror?
A) 19 cm B) 35 cm C) 60 cm D) 75 cm E) 120 cm