In raising a 5000-N piano with a pulley system, it is noted that for every 1 m of rope pulled down, the piano rises 0.1 m. Ideally, this means the force needed to lift it is about
A) 50 N.
B) 500 N.
C) 5000 N.
D) not enough information given
B
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Pollution of water in large aquifers is essentially irreversible in the short term (decades).
Answer the following statement true (T) or false (F)
Which of the following is true of the reaction: O2(g) ? 2 O(g)?
A) It is endothermic. B) It is exothermic. C) It is neither endothermic nor exothermic. D) None of these, the reaction cannot occur.
Supplies of fossil fuels are
A. Continually expanding in nature B. Almost entirely depleted C. Easily found through better technology D. Being steadily depleted E. Being renewed as fast as we use them
High salinity values in ocean water are due to ________.
A) higher evaporation rates B) higher longitudes C) lower longitudes D) lower evaporation rates