Political opinion surveys.
Q1) If 2 political opinion surveys of about 3000 people each give results as 45% will vote No and the other 50% will vote No, and their stated estimated errors are each +/- 3%, can they be said to agree with each other? Support your answer. Q2)Radioactivity and the Age of the Earth. A) Define radioactivity and half- life. B) Draw curves showing how the relative amounts of a radioactive parent and a stable daughter can yield an absolute date for a rock sample. C) What are the main uncertainties in this technique? D) WHAT EVIDENCE SHOWED Lord Kelvin’s estimate for the age of the Earth was incorrect? Q3) KEPLER AND NEWTON. In the late 1500s Kepler derived his three laws of planetary motion by laboriously hand calculating the orbit shape that best fit Tycho Brahe’s observations of the positions of Mars and then Jupiter and the other then known planets. A) Briefly state Kepler’s 3 laws, using a sketch if needed. B) Explain why the 2 nd law is a logical consequence of his 1 st law and the law of conservation of energy, both kinetic and potential. C) Explain how, about 80 years later, Newton used Kepler’s third law to give support to his proposed gravity force law, F G =GMm/R 2 , specifically the 1/R 2 part