Second Semester Physics Portfolio

Pics for final portfolio

Radio Communication Final

Radio Communication-Physics Final

Sound- pressure variations in matter, like water and air. Does not travel through a vacuum. Radio waves are electromagnetic waves that do trave through a vacuum. When you tune on te radio, you hear the music and sounds because the radio station has a transmitter that converts the sound waves into electromagnetic waves. A transmitter is an electornic device that with the use of an antenna, produces radio waves. The electromagnetic waves are then encoded onto an electromagnetic wave in radio frequency range. AM radio range is 500-1600 kHz and for FM radio, it's 86-107 kHz. Radio electromagnetic waves are important because they travel through large spaces without being absorbed. Radios receive radio information, decode the information and uses speakers to change it into a sound wave.

"Independent" Research Projects

BOAT: We chose the project to do the clay boats and hot air balloons. They float because of the density of air and buoyancy to float on the water. Buoyancy is the force equal to fluid...the weight of the displaced fluid. It is the upward force and keeps things floating. An object will float if the buoyancy is greater then the weight. We found the weight of the displaced fluid. We placed the boat in a container filled to the very top with water and formed a meniscus. When the boat was placed in the water, water spilled into a larger container and the this was the water the boat pushed out. Our little boat was 67.17 grams and the water it pushed out should have been equal to the boat. The water pushed out was 70 grams.

BALLOON:Denisty is: Mass/Volume Denisty is a physical property of matter that expresses a relationship of mass to volume. The denser, of two equal volume objects will be heavier. We made a hot air balloon with tissue paper, glue, templates and paper clips. We followed all the directions and created a balloon. We used the Indoor Balloon Tester and the pressure of the air pushing the balloon up made it float.

ARCHIMEDES: Archimedes Principle states:An object immersed in a fluid is buoyed up up by a force equal to the weight of the fluid displaced by the object. Knowing mass and volume of an object allows to calculate density.

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Pinhole Cameras and Their Pictures...