The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that on the moon. The ratio of the mass of the moon to that of the earth is?
A. 1:80 B. 1:320 C. 1:1280 D. 1:4 Correct Answer: Option A = 1:80 Explanation NOTE: Firstly, it should be noted that the mass, as well as the weight of a body, is independent of its size. ∴ Let the weight of the moon = Mm x gm weight of the earth = Me x ge But ge =...
As the pressure of a fluid increases; its viscosity?
A. decreases B. increases C. increases then decrease D. remains constant Correct Answer: Option B – increases
A 100kg box is pushed along a road with force of 500N. If the box moves with a uniform velocity; the coefficient of friction between the box and the road is?
A. 0.4 B. 1.0 C. 0.8 D. 0.5 Correct Answer: Option D = 0.5 Explanation Coefficient of friction μ = F/R = F/mg = 500/1000 = 0.5 ∴ μ = 0.5
In a hydraulic press; a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N; the area of the large piston is?
A. 4m² B. 8m² C. 2m² D. 1m² Correct Answer: Option A Explanation Pressure developed in the effort piston = F/a ∴F/a = 40/0.4 = 400/4 = 100Nm2 this pressure is transmitted to the larger piston of area A; => P = F/A ∴ 100 = 400/A => A = 400/100 =...Products
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