Turn over 3 3 When a force F is applied to a spring with stiffness k, the elastic potential energy stored is E. What is the elastic potential energy stored when a force 2F is applied to a spring with stiffness 2k? A E 2 B E C 2E D 8E (Total for Question 3 = 1 mark) 4 There are several different methods that can be used to determine the distance from our solar system to astronomical objects. These include the measurement of red shift, trigonometrical parallax and the use of standard candles. Which row of the table shows a suitable method for each of the objects named? Nearby star Nearby galaxy Very distant galaxy A parallax red shift standard candle B red shift standard candle parallax C parallax standard candle red shift D red shift parallax standard candle (Total for Question 4 = 1 mark)