Physics Online Course Essay Example for Free

Physics Online Course Essay1-How can you demonstrate that weewee is denser than crank without weighing them? What is the principle involved?Release an ice cube in water the ice cube go out float. The ice cube will dissolve some water as it pushes the water away. The principle involved is displacement.2-The density of water is a maximum at 4C. Why is this property of water important for aquatic life?The maximum density being attained at 4C means that even if the water gets colder, the density will decrease. Therefore, ice (when it forms) floats instead of sinks. This makes the continuity of aquatic life during winter possible.3-When two different materials ar given the same amount of heat will their temperatures gain by the same amount? Explain with reasons?No. It depends on the ability of the materials to conduct heat.4-It is generally observed that it is more difficult to cook food at high altitudes. Explain the possible reason for this?In higher altitudes, there is lower pressure. This means that water will not boil at nose candyC, but at a lower temperature, making your water not as hot as on sea-level, making cooking time longer.5-What are the variable factors that affect the pitch (frequency) of a vibrating string? How are these factors controlled in a stringed musical instrument such as a violin?The belt along and wavelength of the waves formed by striking an object. A musician controls the frequency through the strings tension and density, by pressing some of the strings.6-If you want to see yourself fully in a plane reflect, the mirror needs to be only half your height. Draw a ray draw showing how this is possible. Explain the diagram and principles you used.The image in the mirror looks as if the figure is far away, when in fact, it is right in front of the mirror. This is because the light received by the eye travelled in a straight line as if it came from behind the mirror. The mirror is also laterally inverted, meaning the figures rig ht will appear as the mirror images left.ReferencesLeigh, J.R. (1988). Temperature measurement and control. USA Institute of Engineering and Technology.Sumich, J.L. and Morrissey J.F. (2004). Introduction to the biology of marine life. Massachusetts Jones and Bartlett Publishers.Pople, S. (1987). Explaining physics. United Kingdom Oxford University Press.Dolan, G., Duffy, P. and Percival, A. (1996). Physics. United Kingdom Heinemann.