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Propably because it would be very difficult to measure the difference between the rings' diameters.

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Q: Why should radius of curvature of lens in newton's ring apparatus be large?
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Why should you use a convex lens of large radius of curvature in performing newtons ring experiment?

Radius of rings is directly proportional to the square root of the radius of curvature. Thin lens would have larger radius of curvature and hence the option

How get degree of curvature?

The degree of curvature measures how much a curve deviates from a straight line. It is commonly used in mathematics, engineering, and surveying. Two common methods are the circular curve method and differential geometry. The circular curve method determines the degree of curvature by measuring the central angle subtended by a 100-foot arc along the curve. The differential geometry approach calculates the curvature at each point on the curve and integrates these values to find the total degree of curvature. The specific method used depends on the field and context. Consult relevant resources or experts for detailed instructions.

Should you never touch an apparatus without the teachers permission?

to avoid any breakage of the apparatus

From what language has apparatus been derived?

I should assume Latin

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In general a brace would be used when a curvature of the spine is at 25-40º

What is the measure of the force of attraction between objects due to gravity called?

The force of gravity between two objects is measured in newtons. This is no different, technically, than what weight "should" be measured in. We use pounds and kilograms, but we should be using newtons, to be scientifically correct.

How do you remove excess hydrogen from a apparatus where oxygen should be collected?

fill with water

Common name for raduis?

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Torque is equal to friction force (F) * radius (r). Torque is also equal to moment of inertia (I) * Angular acceleration (a). Angular acceleration is equal to rotational velocity * 2Pi/time, which is 2 seconds. So, F = IRa/r, or 45.63 Newtons

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