What volume of alcohol will have same mass as 4.2m³ of petrol? Density of alcohol = 8.4 x 102kgm−³, density of petrol =7.2x103kgm−³
A. 0.8m³ B. 1.4m³ C. 3.6m³ D. 49m³ Correct Answer: Option C – 3.6m³ Explanation Mp = ep x Vp Mp = 7.2 x 10² x 4.2 = 3024 VA = M/eA VA = 3024/(8.4×10²) VA = 3.6
Calculate the work done when a force of 20N stretches a spring by 50mm.
A. 0.5J B. 1.5J C. 2.0J D. 2.5J Correct Answer: Option A – 0.5J Explanation W = ½Fe W = ½×20×0.05 W = 0.5J
What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?
A. 80N B. 90N C. 100N D. 120N Correct Answer: Option C – 100N Explanation M.A. = Eff×V.R/100 M.A. = 90×2/100 M.A. = 1.8 E = L/M.A. E = 180/1.8 E = 100N
The coefficient of friction between two perfectly smooth surface is?
A. infinity B. one C. half D. zero Correct Answer: Option D – zeroProducts
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