Astudent pushes a 40-n block across the floor for a distance of 10 m how much work was done to move the block

w = 400 joules

Explanation:

Work done is the force that causes the displacement of an object. Work done is the product of force and distance. A force acting on an object is only regarded as a work done if the object has an appreciable displacement.

Mathematically,

Work = force × distance

force = 40 Newton

distance = 10 m

W = 40 × 10

w = 400 joules

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