In the cosmological principle, ________ implies that the direction the observer faces makes no difference on the grandest scale
Fill in the blank(s) with correct word
isotropy
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The stars of the halo are all old, and those of the disk are all new
Indicate whether the statement is true or false
Calculate the kinetic energy (in eV) of a nonrelativistic neutron that has a de Broglie wavelength of 9.9 × 10-12 m. (h = 6.626 × 10-34 J ? s, mneutron = 1.675 × 10-27 kg, 1 eV = 1.60 10-19 J)
What will be an ideal response?
Of the quarks u, d, c, s, t, and b, which have positive fractional electronic charge?
a. u, d, c c. s, t, b b. d, s, b d. u, c, t
A rectangular plate in plane stress is subjected to normal stresses ?x and ?y and shear stress ?xy. Stress ?x is known to be 15 MPa, but ?y and ?xy are unknown. However, the normal stress is known to be 33 MPa at counterclockwise angles of 358 and 758 from the x axis. Based on this, the normal stress ?y on the element in the figure is approximately:
(A) 14 MPa
(B) 21 MPa
(C) 26 MPa
(D) 43 MPa