# Jeremy Walther

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Gravity

## Waves

Waves have a surprising amount of physics behind them, and not the waves at football games.  The simplest definition of wave motion is that it moves energy from one point to another.  Waves are an oscillation of energy that travels through a medium.  Their are tow main types of waves, one being mechanical waves.  Mechanical waves travel through a medium and are then restored by restoring forces to reverse the work done.  The other type of waves is electromagnetic waves in which the main differen

## Physics of bball

Marcus has been wondering why I always win in our 1 v 1 basketball games and their is lots of physics behind it.  The first part of my success is how high I am able to jump.  There are horizontal and vertical components to jumps and being able to shoot and or block shots during the top part of the flight plays a major role in winning.  I also am able to jump higher giving me the ability to have a longer hang time.  This increases the time during the top part of my flight.  The equation to calcul

## Physics of a yo-yo

Their are many factors that make a yo-yo spin showing they are actually more complicated than people may first think.  Gravity is an obvious force as it is what pulls the yo-yo down.  Friction is the reason that it unwinds and returns.  Without friction the yo-yo would not spin nor would it return to the starting position.  When it is at this starting position it is containing the potential energy to fall and spin.  This is then converted into kinetic energy when it starts its trip.  The yo-yo h

## Physics of sleeping

The brain goes through lots of weird stages and experiences while sleeping that are very different from when you are awake.  For one, the brain waves slow down dramatically.  When awake the brains frequency is around 30hz and that drops to less than 3.5hz when the person falls asleep.  There are around 5 stages of sleep every time you go to bed at night.  The first stage includes a very light sleep while the second becomes slightly deeper.  The third and fourth stages are the deepest part of it

## Physics of a hot air balloon

I think that everyone knows how a hot air balloon works in theory but what are the basic physics behind it?  The basic concept of it is that it blows hot air into the large balloon at the top to create buoyancy which eventually causes the balloon to lift.  The air inside of the balloon is ultimately less dense than the air outside and this difference in density is also what causes the balloon to lift.  The principle behind this lift is called Archimedes principle.  This states that the upward bu

## Javelin Throwing

Javelin throwing as it can be implied is largely dependent on the throwing angle.  While it seems as if it should be like any other activity where 45 degrees is the optimal firing angle, it is not that case.  Wind speed and direction have a huge dependence on choosing this angle.  The strength and speed that the thrower can release with is also a huge factor.  When studied it was found that some of the best javelin throwers in the world were actually releasing at a angle lower than 45.  The opti