C c) A light spiral spring is loaded with a mass of 50g and it extends
by 10cm) Calculate the period of
small vertical oscillations
i) A simple pendulum has a period
of 2.0s and on amplitude of swing
5.0 com. Calculate the maximum
magnitudes of
the velocity of the bob,
the acceleration of the bob
of
,
On the hood

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?