Here is a list of five units for physical quantites. kgm-3 Nm-2 Cs-1 Ω m Ws From the list a) write down the unit for electrical current ................ b) write down the unit for mechanical stress ................ (2 Marks) (Marks available: 2) Answer Answer outline and marking scheme for question: 1 a) Cs-1 b) N m-2 (2 Marks) (Marks available: 2) Here is a list of five units J N Jkg-2 Nkg-1 From the list write down the correct unit for a) the energy stored in a stretched spring ................ b) centripetal force ................ (Marks available: 2) Answer Answer outline and marking scheme for question: 2 a) the energy stored in a stretched spring ............. J... b) centripetal force ......... N....... (Marks available: 2) The acceleration, a, of a body in simple harmonic motion is given by: a = - (2π f)2x Where f if frequency of the oscillation and x is the displacement. Show that the right hand side of the equation has the units of acceleration. (Marks available: 2) Answer Answer outline and marking scheme for question: 3 Unit of f 2 is s-2 (1 Mark) or f is s-1 (unit of x is m therefore) combined unit is m s-2 (which is the uni of acceleration) (1 Marks) (Marks available: 2 Marks)