What is the net force on the box above?

A. 10 N

B. 15 N

C. 25 N

D. 30 N

30 N

Explanation:

Data:

The net force is the difference in the forces on the box. Suppose the box was being pulled by a force of 60 N and the frictional force was 30 N. The net force would be given as:

       = 60 - 30

       = 30 N

the answer is otpion c) understanding

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ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg