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NARA [144]
2 years ago
14

Some homes have stairs that are too steep or narrow for moving large pieces of furniture. In such cases, furniture may be lift e

d by pulleys and moved in through upper windows. What is the efficiency of a system that uses 280 N of force to lift a 100 kg bed 6 m to an upper window? Those working the system have to pull 24 m of rope to lift the bed.
Biology
1 answer:
torisob [31]2 years ago
7 0

Answer:

The efficiency of the system is 89.3%

Explanation:

Efficiency of a machine is defined as the ratio of useful work done by a machine to the total work put into the machine.

Mathematically, efficiency = (work output/work input) * 100%

work output = load * load distance

where load = 100 kg * 10 m/s² = 1000 N; load distance = 6m

work output = 1000 * 6 = 6000 J

work input = effort * effort distance

where effort = 280 N, effort distance = 24 m

work input = 280 * 24 = 6720 J

Efficiency = (6000/6720) * 100%

Efficiency = 89.3%

Therefore, the efficiency of the system is 89.3%

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There are several different kinds of aquatic ecosystems. Bogs get their water from precipitation, so they don't have many Fill i
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  2. Marsh plants are adapted to waterlogged <u>soil</u>
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Explanation:

A wetland is a biome which has both water and land that are intermixed in various ways. According to the type of the wetland, the ecosystem differs.

Bogs: Wetland with water from precipitation and no inflow or outflow of surface or ground water.  

Soil: Acidic, infertile with less nutrient content

Vegetation: Acid-loving plants

Swamps: Forest wetlands near rivers and lakes.

Soil: well draining, mineral soil

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Soil: Organic and mineral soil

Vegetation: Hydrophytic plants adapted to waterlogged soil

Estuaries: Wetland regions enclosed by land one side where fresh water mixes with saline ocean water.  

Soil: Saline alkaline soil

Vegetation: Mangrove trees

Rivers and lakes are water bodies that form a part of wetlands.  

Rivers are flowing water bodies which flows through water current and picks up sediments as it flows.

Lakes are stationary water bodies that are enclosed by land mass on all its sides.

The wetlands act as a natural filter and receive all the sediments, pollutants etc which are dissolved in water and carried by the rivers and other water sources.

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