Solar energy is a growing demand in the United States as more funding has allowed this energy source to become much cheaper and more available to the average person. They are converting the suns energy into electricity using solar cells. This relies on the photoelectric effect which is the ability of matter to emit electrons when a light is shone on it. Silicon is a semi-conductor which makes it a key ingredient in making solar cells. Sunlight is composed of many photons and as these hit the
The water bottle flip challenge became very popular very quick but it is not just luck in getting the bottle to land upright. When the bottle is moving through the air during its flip, the water begins to climb the sides of it. This causes an increase in it's moment of inertia which in return, decreases its rotational speed. This is very similar to a diver who extends his arms and legs in order to slow his spin or an ice skater. The amount of water inside of the bottle also plays a major rol
Bulletproof vests are becoming much more common as they are becoming very easy to conceal. People are able to wear them under shirts and jackets and no one would ever know. They are very widely used in the military and police and law enforcement work. The vests are designed to disperse a bullets energy in order to minimize the blunt force trauma. Their are a couple different types of body armor. One of which is heavy body armor and is made of strengthened steel plates. The only down side t
Video games are constantly progressing in terms of how real they are becoming and the graphics. Part of these games becoming more realistic is the implementation of physics into them. The purpose of them is making everything appear more real to the viewer as if they were actually in the game. One big part of this is ragdoll physics. This is where bodies in video games appear more and more to have a realistic bone structure and similar joint movements as an actual human body. This includes b
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
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
