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Revision Test 3: Algebra and simple equations

D + 4 d Evaluate d when T = 10 and D = 32 (5)

19. The modulus of elasticity E is given by the formula: E = F L

x A where F is force in Newton’s,

L is the length in metres, x is the extension in metres and A the cross-sectional area in square metres. Evaluate A, in square centimetres, when E = 80 × 109N/m2, x = 2 mm, F = 100 × 103N and L = 2.0 m (5)