Answer:
Plantlife, grow a garden. Animal life, raise some livestock. And a water source, most definitley.
Explanation:
Answer:
C. Plants must be able to increase their mass using substances in addition to what is found in soil
Explanation:
The plant increased its mass by 74.4 kg, and the mass of the soil decreased only by 54 g (less than 0.1 % the mass of the plant).
The plant must have gotten its mass from someplace other than the soil.
A is wrong. The plant gets its mass from someplace else.
B is wrong. Plants don't need soil as such, but they need the water that is in the soil.
D is wrong. The water contains no food. It is just water.
E is wrong. The experiment demonstrated nothing about oxygen.
Answer:
b. laminar flow
the reynold number is 1329.26
Explanation:
Re = (V x D x ρ)/ η
where,
V = mean velocity = 15.9 cm/s = 0.159m/s
D = vessel diameter = 2.15cm = 0.0215m
ρ = blood density = 1050 kg/m3 = 0.00105 kg/cm3
η = dynamic viscousity= 2.70 × 10-3 Pa·s = 2.70 × 10-3 kg/m-s
applying the formular to calculate for reynolds number, Re =
Re = (V x D x ρ)/ η
=(0.159 x 0.0215 x 1050) / 2.70 × 10-3
=3.589/0.0027 = 1329.26
the Reynolds number for the blood leaving the heart through the aorta if the diameter of the aorta is 2.15 cm and the blood has a dynamic viscosity of 2.70 × 10-3 Pa·s, a density of 1050 kg/m3, and travels at a mean fluid velocity of 15.9 cm/s is 1329.26
which flow through the aorta in a Laminar flow
Note that
a) turbulen= Re >4000
b) laminar= Re <2300
c) transitioning between laminar and turbulen= Re between 2100 and 4000
