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Question 1: The shutter speed S of a camera varies inversely to the square of the aperture setting f. When S = 0.0034, f = 10. a) Find a formula for S in terms of f b) Calculate S when f = 16 c) Calculate f when S = 0.0053125.  
Question 2: The pressure p (measured in atmospheres) acting on a hotair balloon is inversely proportional to the square root of the height h in metres. At a height of 2116m the pressure is 0.62 atmospheres. a) Find a formula for p in terms of h b) What is the pressure at 8836m (to 2 d.p.)? c) At what height (to 2 d.p.) is the pressure 0.38?  
Question 3: Y is inversely proportional to the cube of X. When X = 3, Y = 0.1. a) Find a formula for Y in terms of X b) Calculate Y when X = 13 (to 4 d.p.) c) Calculate X when Y = 13 (to 2 d.p.)  
Question 4: A is inversely proportional to the cube root of B. When A = 2.1, B = 1.728. a) Find a formula for A in terms of B b) Calculate A (to 3 d.p.) when B = 140.608. c) Calculate B (to 3 d.p.) when A = 9.3.  
Question 5: P is inversely proportional to Q. Complete the table.

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Question 1: a) S= \Large {\frac{0.34}{f^2}} b) 0.001328125 c) 8  
Question 2: a) p= \Large {\frac{28.52}{\sqrt{h}}} b) 0.3 atmospheres c) 5632.9m  
Question 3: a) Y= \Large {\frac{2.7}{X^3}} b) Y = 0.0012 c) X = 0.59  
Question 4: a) A = \Large {\frac{2.52}{\sqrt[3]{B} }} b) 0.485 c) 0.020  
Question 5:
