Four rods that obey Hooke's law are each put under tension. (a) A rod 50.0 cm 50.0 cm long with cross-sectional area 1.00 mm 2 1.00 mm2 and with a 200 N 200 N force applied on each end. (b) A rod 25.0 cm 25.0 cm long with cross-sectional area 1.00 mm 2 1.00 mm2 and with a 200 N 200 N force applied on each end. (c) A rod 20.0 cm 20.0 cm long with cross-sectional area 2.00 mm 2 2.00 mm2 and with a 100 N 100 N force applied on each end.

Four rods that obey Hooke's law are each put under tension. (a) A rod 50.0 cm long with cross-sectional area 1.00 mm2 and with a 200 N force applied on each end. A rod 25.0 cm long with cross-sectional area 1.00 mm2 and with a 200 N force applied on each end. .00 mm2 and with a 100 N on each end. (c) A rod 20.0 cm long with cross-sectional area 2 force applied Order the rods according to the tensile stress on each rod, from smallest to largest.

Explanation:

Tensile stress is given as =

σ = Force/Area

A. Given that

Length of rod = 50cm

Cross-sectional Area A = 1mm²

A = 1 × 10^-6m²

Force applied F = 200N

Then, σ = F/A

σ = 200/1×10^-6

σ = 200 × 10^6 N/m²

σ = 200 Mpa

B. Given that,

Length of rod = 25cm.

Cross-sectional Area A = 1mm²

A = 1 × 10^-6m²

Force applied F = 200N

Then, σ = F/A

σ = 200/1×10^-6

σ = 200 × 10^6 N/m²

σ = 200 Mpa

C. Given that,

Length of rod = 20cm.

Cross-sectional Area A = 2mm²

A = 2 × 10^-6m²

Force applied F = 100N

Then, σ = F/A

σ = 100/2×10^-6

σ = 50 × 10^6 N/m²

σ = 50 Mpa

It is noticed that

50Mpa < 20Mpa =200Mpa

Then, C < B = A

The tensile strength of rod A and B are equal and their tensile strength is greater than that of Rod C

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

hope this !