Which energy is an energy of position?
(a) kinetic
(b) heat
(c) potential
(d) force x time
(e) watts
Answer: (c) potential
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a. changing b. increasing c. constant d. decreasing
The separation of different isotopes of a particular element can be difficult because
A. all isotopes are dangerous because of their radioactivity. B. the masses of the isotopes are the same. C. neutrons are so small. D. chemical reactions happen the same way for the isotopes.
If the earth's electric field is 100 N/C downward, what must be the charge on a 1-kg object so that it would be "weightless"?
A) 9.8 C B) 0.22 C C) 1.0 C D) -9.8 × 10-2 C E) 9.8 × 10-2 C
Find the sum of the following two vectors: (i) 50 units due east and (ii) 100 units 30° south of west
a. 100 units 30° south of west c. 87 units 60° south of west b. 62 units 54° south of west d. 62 units 15° south of west