In this part of the experiment, you will investigate the physical parameters that have an effect on the resistance of a conductor. The conductors to be used are given as in the following. Brass (0.00203 cm') Brass (0.00519 cm) Brass (0.00811 cm") Brass (0.0127 cm) Copper (0.00811 cm) Aluminum (0.00811 cm") Stainless Steel (0.00811 cm) Nichrome (0.00811 cm") Part C: Resistance vs Resistivity (p) In this part resistance of five different material wires with same diameter and length are to be measured and compared. (I = 1A with the exception of (I = 0.5A) for Nichrome) Table 3. Resistance of conductor for different resistivity D (cm) A(cm) Length (cm) I (A) Voltage (mV) TA Res. (A) Pam) Brass 0,1016 337 5,3 0,00811 24 Copper 0,1016 0,00811 0,00811 24 Aluminum 0,1016 24 Stainless Steel0,1016 Nichrome IA TA 122, 3 0,00811 24 332 0,1016 0,00811 24 0,5 Question: How did the resistance of the conductor change with respect to cross-sectional area? Did the change occur as you have expected? Explain how you performed the calculation of resistivity. Your Answer: Task (Plot): Plot Resistance vs Resistivity (p) graph (Independent variable p on x axis, dependent variable R on y axis)

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.