Ablock has a volume of 0.09 m3 and a density of 4,000 kg/m3. what's the force of gravity acting on the block in water? a. 3,528 n b. 882 n c. 2,646 n d. 3,038 n

The answer is 2,646 N

(see Page 90 - section 5 example)

F=Veg

F= 0.09 m3 x 4,000 kg/m3 x 9.8 m/s2

F= 360 x 9.8

F = 3,528 ( this is the force of gravity acting on the block in air)

What is the force of gravity acting on the block in water:

F=mg

F= Vdg

F= 0.09 m3 x 1,000 kg/m3 x 9.8 m/s2

F= 90 x 9.8

F= 882 N

subtract the weight of the displaced water from 3,528 N

(3,528 N - 882 N = 2,646 N)

The force of gravity acting on the block in water is 2,646 N

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because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .