1. A disc of moment of inertia 1.8 kg.m2 is rotating at a constant angular velocity of 3.2 rad.s-1. Another disc of moment of inertia 0.6kg.m2 initially at rest falls onto the first disc and the two rotates as a system. Which of the following statement(s) is/are true of this sprocess?
(i) The angular velocity for this process is conserved
(ii) The initial angular momentum of the first disc before the second disc fell on it is 5.76 kg.m2.s-1
(iii) The angular momentum of the system is conserved.
2. What is the pressure in absolute units at the eye of a hurricane if a mercury barometer placed there reads 700 mm? The density of mercury is 13600 kgm-3
Choose the statement(s) that is/are true of elasticity of a material.
(i) Elasticity is the ability of a material to undergo deformation.
(ii) Elasticity is the ability of a material to regain its original shape after being deformed.
(iii) Elasticity is the ability of an object to resist deformation.
(iv) A higly elastic material can be stretched easily.
3. A steel column that has a diameter of 10 cm supports a mass of 1000 kg resting on it. What is the stress produced on the steel column?