3. The quantity varies as the cube of (x + 2). y = 32 when = 0. y x Find when = 1. y x = Answer y ………….………… [3] The wavelength, of a radio signal is inversely proportional to its frequency, When = 200, 4. w, f. f = 1500. w (a) Find an equation connecting and f w. Answer (a) ……….………………….…… [2] (b) Find the value of when = 600. f w = Answer (b) f ……….………………….….. [1] 5. The force of attraction (F) between two objects is inversely proportional to the square of the distance (d) between them. When = 4, = 30. d F Calculate when = 8. F d = Answer F …………………….………… [3]
3. The quantity y varies as the cube of (x + 2). y = 32 when x = 0. Find y when x = 1. Answer y = ………….………… [3] 4. The wavelength, w, of a radio signal is inversely proportional to its frequency, f. When f = 200, w = 1500. (a) Find an equation connecting f and w. Answer (a) ……….………………….…… [2] (b) Find the value of f when w = 600. Answer (b) f = ……….………………….….. [1] 5. The force of attraction (F) between two objects is inversely proportional to the square of the distance (d) between them. When d = 4, F = 30. Calculate F when d = 8. Answer F = …………………….………… [3]