If a point charge of -30 µC experiences an electrostatic upward force of 27 mN at a certain location in the laboratory, what are the magnitude and direction of the electric field at that location?
What will be an ideal response?
0.90 kN/C downward
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Most of the mass of a galaxy is contained in the
a. massive O and B stars in the galaxy. b. H I regions of the galaxy. c. H II regions of the galaxy. d. dark matter of the galaxy. e. disk of the galaxy.
A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
Of the five rock-forming mineral groups—the silicates, carbonates, oxides, sulfides, and sulfates—which two form economically important ores?
A) silicates and carbonates B) carbonates and oxides C) oxides and sulfides D) sulfides and sulfates
The diagram below shows two stars in a binary system and the center of mass of the system. Based on the diagram, the ratio of the mass of star A to the mass of star B is _____
A) 2:1 B) 1:2 C) 1:3 D) 3:2