A 2-kg mass is held 4 m above the ground. What is the approximate potential energy of the mass with respect to the ground?

A) 20 J
B) 40 J
C) 60 J
D) 80 J
E) none of the above

D

Environmental & Atmospheric Sciences

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If a neutral element has the following chemical notation, how many electrons does it have?carbon-13

A. 6 B. 7 C. 12 D. 13 E. none of the above

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Atoms with different numbers of neutrons in their nucleus are

A. ions. B. electrons. C. isotopes.

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The use of what energy resource is a major contributor to acid rain?

A) coal B) geothermal power C) hydropower D) natural gas E) nuclear power

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The largest lithospheric plate is the Pacific Plate.

Answer the following statement true (T) or false (F)

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