A(n) _____ is a cluster of galaxy clusters
A) supercluster
B) protocluster
C) megacluster
D) extrasolar cluster
A
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Two identical charges, 2.0 m apart, exert forces of magnitude 4.0 N on each other. The value of either charge is:
A) 1.8 × 10-9 C B) 2.1 × 10-5 C C) 4.2 × 10-5 C D) 1.9 × 105 C E) 3.8 × 105 C
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?
A) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. B) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. C) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. D) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.
A drive shaft resists torsional shear stress of ?xy 5 40 MPa and axial compressive stress ?x 5 70 MPa. One principal normal stress is known to be 38 MPa (tensile). The stress ?y is approximately:
(A) 23 MPa
(B) 35 MPa
(C) 62 MPa
(D) 75 MPa
Two nonparallel vectors determine a plane. Relative to the plane determined by the position vector and velocity vector of a particle, in which direction is the angular momentum vector about the origin?
A) in the plane, but perpendicular to the velocity vector B) in a direction dependent on the magnitudes of the velocity and position vectors C) perpendicular to the plane D) in the plane, but perpendicular to both the position vector and the velocity vector E) in the plane, but perpendicular to the position vector