Why is an egg less likely to break when dropped onto soft foam rather than concrete?
When the egg is dropped on a hard surface, dt is small thus F is large enough to break the egg. If it’s dropped on a soft surface, it still undergoes the same change in momentum, but it takes longer to come to rest, so dt is large, thus F is small.
Why are eggs more likely to break on concrete than foam?
When an egg is dropped on concrete, the surface of the concrete is harder than the grass. Due to the harder surface, the egg will break in a shorter time interval than if were dropped on grass. Grass will have the effect of an air bag so the time interval will be longer.
Why does an egg break when dropped?
Gravity causes an object to fall to Earth when dropped. Drop an egg from eye level so that it breaks. When the egg hits the ground with a given force, the ground exerts the same force back on the egg. If too large a force is delivered to the egg shell, the egg will crack.
What is the albedo value of a perfect black body?
Albedo varies between 0 and 1. Albedo commonly refers to the “whiteness” of a surface, with 0 meaning black and 1 meaning white. A value of 0 means the surface is a “perfect absorber” that absorbs all incoming energy.
What is a black body GCSE?
An object that is good at absorbing radiation is also a good emitter , so a perfect black body would be the best possible emitter of radiation. Features of a perfect black body. Stars are considered to be black bodies because they are very good emitters of most wavelengths in the electromagnetic spectrum .
What Colour emits the most radiation?
A black body also is a perfect emitter of light over all wavelengths, but there is one wavelength at which its emission of radiation has its maximum intensity. Hotter objects emit more radiation than colder objects over all wavelengths.
What is a Leslie cube used for?
Leslie’s cube is a device used in the measurement or demonstration of the variations in thermal radiation emitted from different surfaces at the same temperature.
Does a mirror get hot?
Yes. One of the main forms of heat transfer is by electromagnetic radiation. Visible light is one sort of electromagnetic radiation and it carries some heat energy. That can be reflected by mirrors, but mirrors are designed to reflect visible light best.
How much heat does a mirror absorb?
If it were a perfect mirror at all wavelengths (colours including the ones you can’t see) you are right it wouldn’t heat up as all the energy would be reflective. However a normal mirror is not perfect and probably absorbs 5-10% of the visible light on it and a bit more in the infra-red.
Can you see fire in a mirror?
Mirrors can potentially reflect these sources of radiation. But they cannot reflect physical processes like flames or light bulbs, just the radiation that comes out of them.