Nuclear fusion is the source of energy in stars
a. True
b. False
Indicate whether the statement is true or false
True
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Suppose a planet is discovered by the Doppler technique and is then discovered to have transits. In that case, we can determine all the following about the planet except
A) its precise mass. B) its density. C) its physical size (radius). D) its rotation period. E) its orbital period.
A cast iron pipe (L 5 12 m, weight density 5 72 kN/m3, d2 5 100 mm, and d1 5 75 mm) is lifted by a hoist. The lift points are 6 m apart. The maximum bending stress in the pipe is approximately:
(A) 28 MPa
(B) 33 MPa
(C) 47 MPa
(D) 59 MPa
A hollow circular post ABC (see figure) supports a load P1 5 16 kN actat the top. A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB 5 30 mm, tAB 5 12 mm, dBC 5 60 mm, and tBC 5 9 mm, respectively. The lower part of the post must have the same compressive stress as the upper part. The required magnitude of the load P2 is approximately:
(A) 18 kN
(B) 22 kN
(C) 28 kN
(D) 46 kN
Reactions that take place in a breeder reactor change
A) elements into different elements. B) molecules into different molecules. C) ions into different ions. D) all of the above E) none of the above