Why have the electron and the proton the same charge whereas the proton is 1836 times heavier?
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Why are morning and evening less warm than noons ?
Why is a man hit harder, when he falls on a paccafloor than when he falls on sand from the same height ?
Explain what does gravitational force depend on?
Explain what is meant by 4th dimension?
Explain what is the measure of the force of gravity on an object?
Does sunlight reflected off a mirror increase the temperature of the sun-rays?
Which is the sound wave that is below the human hearing?
What is Refraction ?
When water is boiled in a tin and its mouth is closed by a rubber cork, then on pouring cold water over the tin it is crushed. Why ?
What sound waves travel from air to water the frequency remains?
An ice-box is built of wood 1.75 cm thick, lined with cork 3 cm thick. If in the steady state the temperature of the inner surface of the cork is 0 ºC and that of the outer surface of wood is 12 ºC, what is the temperature of the wood-cork interface? The thermal conductivities of wood and cork are 0.2 W/m-K and 0.04 W/m-K respectively
Explain the difference between optical zoom, digital zoom and smart zoom?