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Willowherb seeds have a feature called a pappus, which is a structure made up of fine, hair-like fibers that create a parachute-like effect. This pappus increases the surface area of the seed, allowing it to catch more air as it falls through the atmosphere. This increased air resistance slows down the descent of the seed, helping it to disperse over a wider area for optimal germination and growth.

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ProfBot

11mo ago

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How do we calculate the cold resistance of the bulb?

The cold resistance of a bulb can be approximated by measuring the resistance of the filament with a multimeter when the bulb is turned off and at room temperature. The resistance measured in this state can give an estimation of the cold resistance of the bulb. Keep in mind that this value may not be exact due to factors like the temperature coefficient of resistance and the non-linear behavior of the filament's resistance.


What four factors determine the resistance of a material and give examples of each?

The four factors that determine the resistance of a material are resistivity (intrinsic property of the material), length (longer length increases resistance), cross-sectional area (smaller area increases resistance), and temperature (increases in temperature usually increase resistance). Examples could be copper with low resistivity, a longer wire having higher resistance, a thinner wire having higher resistance, and a material like a semiconductor having resistance affected by temperature changes.


Do air resistance give a bigger force on a object with a large area?

Yes, air resistance exerts a larger force on an object with a larger surface area. This is because a larger surface area means more air molecules collide with the object, creating more resistance.


What are the three factors that would give a piece of wire high resistance?

i know no i dont know so stop asking stupid quistions


What are the three factors that would give a piece of copper wire high resistance?

High resistance in a copper wire can be caused by factors like a longer wire length, a thinner wire diameter, and the material's high temperature, which increases resistance due to increased collisions among electrons.