How many elements occur naturally on Earth?
a. 102
b. 88
c. 112
d. 82
b
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A typical shooting star in a meteor shower is caused by a ________ entering Earth's atmosphere
A) boulder-size particle from an asteroid B) boulder-size particle from a comet C) pea-size particle from an asteroid D) pea-size particle from a comet E) microscopic particle of interstellar dust
Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (3.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 3.0 m
a. 0.79 kN/C b. 0.17 kN/C c. 0.62 kN/C d. 0.34 kN/C e. 0.28 kN/C
When hydrogen, from Group 1A, unites with chlorine, it forms a(n) ______________ compound
a. ionic b. metallic c. covalent d. organic
An SBc galaxy in the Hubble classification system would have...
A. a barred spiral shape with tight arms. B. a spiral shape with tight arms. C. a barred spiral shape with loose arms. D. an elliptical shape with a medium elongation.