Ion Time: Inour won the table ensuring that the position of the clamp is fixed. = Record the length lo. Taking values of 4 = 50cm 60cm, 70cm, 80cm, 90cm and 100cm, obtain the time for 20 oscillations for each length. Plot graph of the square of period of oscillatio against 4. Obtain the acceleration due to gravit and lo from your graph. Mention two precautior you took while performing this experiment

Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?