# Recent questions in Physics Fundamentals

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# From which end (north or south) of a bar magnet do magnetic field lines emerge?

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Light with an intensity of 1 kW/m2 falls normally on a surface and is completely reflected. The radiation pressure is:​1. 1kPa2. 3×1011Pa3. 1.7 × 10−6 Pa4. 3.3 × 10−6 Pa5. 6.7 × 10−6 Pa
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# Light with an intensity of 1kW/m2 falls normally on a surface and is completely absorbed. The radiation pressure is:

Light with an intensity of 1kW/m2 falls normally on a surface and is completely absorbed. The radiation pressure is:​1. 1kPa2. 3×1011Pa3. 1.7 × 10−6 Pa4. 3.3 × 10−6 Pa5. 6.7 × 10−6 Pa​The answer is D, but I don't know why.
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# Physics Fundamentals - University

A certain wire stretches 0.90 cm when outward forces with magnitude F are applied to each end. The same forces are applied to a wire of the same material but with three times the diameter and three times the length. The second wire stretchesi need steps​
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