KTET Category-3|Previous Questions with Answers|Physical Science|Solved Problems|Part-1 |KtetExamspl

karthika s nair

8 Jan 202120:35

Summary

TLDRThis transcript covers a range of fundamental physics and electrical concepts, including the relationship between kinetic energy and momentum, the reactivity of metals with dilute hydrochloric acid, and the effect of wire radius on electrical resistance. Additionally, it discusses temperature conversions and the calculation of filament resistance in an electric lamp. The script provides both theoretical explanations and numerical examples, helping to clarify these concepts in a practical, easy-to-understand manner. It is ideal for students looking to reinforce their understanding of these basic scientific principles.

Takeaways

😀 The kinetic energy of a body increases four times its initial value, but the new momentum will be twice the initial value.
😀 The relationship between kinetic energy (E) and momentum (p) is given by the equation E = p^2 / 2m.
😀 If the kinetic energy is four times the initial value, the final momentum is half the square root of the initial momentum.
😀 The momentum ratio (p1 / p2) can be expressed as 1 / 2 based on the kinetic energy relationship.
😀 The final kinetic energy (E2) in the given situation is four times the initial kinetic energy (E1).
😀 A wire with a smaller radius (1 cm) will have higher resistance compared to a wire with a larger radius (2 cm) if they are made of the same material and have the same length.
😀 Resistance is inversely proportional to the square of the radius (R ∝ 1/r²).
😀 An electric lamp rated at 220 volts and 100 watts has a filament resistance that can be calculated using the formula R = V² / P.
😀 The filament resistance of the 220V, 100W lamp is approximately 484 ohms.
😀 The script includes a brief mention of various scientific principles, such as the reactivity of metals and resistance calculations, with some minor confusion in the numerical examples.

The video is abnormal, and we are working hard to fix it.
Please replace the link and try again.