A body weighing 80N stands in an elevator that is about to move. The force exerted by floor on the body as the elevator moves upward with an acceleration of 5 ms−² is? [g = 10ms−²]
A. 40 N B. 80 N C. 120 N D. 160 N Correct Answer: Option D – 160 N Explanation Let M = mass of elevator m = mass of the body g = acceleration of free fall a = upward acceleration of the elevator (5m/ss) when the elevator is at rest, the force it exerts on the...
The hydrostatic blood pressure difference between the head and the feet of a boy standing straight is 1.65 x 10^4 Nm−². Find the height of the boy. [Density of blood = 1.1 x 10³ kgm−³, g = 10ms−²]
A. 0.5 m B. 0.6 m C. 1.5 m D. 2.0 m Correct Answer: Option C = 1.5 m Explanation [Density of blood = 1.1 x 10³ kgm−³, g = 10ms−²] Pressure = pgh, where p = density, h = the height, g = acceleration of free fall due to gravity 1.6.5 x 104 = 1.1 x 10³ x 10 x h therefore...
A wheel and axle is used to raise a load of 500N by the application of an effort of 250N. If the radii of the wheel and the axle are 0.4cm and 0.1cm respectively; the efficiency of the machine is?
A. 20 % B. 40 % C. 50 % D. 60 % Correct Answer: Option C – 50 % Explanation Efficiency = M.A/V.R X 100/1 M.A = Load/Effort = 500/250 = 2 V.R. = radius of wheel/radius of axle = 0.4/0.1 = 4. therefore Efficiency = 2/4 x 100/1 = 50...
A copper cube weighs 0.25 N in air; 0.17N when completely immersed in paraffin oil and 0.15N when completely immersed in water. The ratio of upthrust in oil to upthrust in water is?
A. 3 : 5 B. 4 : 5 C. 7 : 10 D. 13 : 10 Correct Answer: Option B = 4 : 5 Explanation Wt. in air = 0.25 N Wt.in water = 0.15 N therefore lost in wt. in water = Upthrust in water = 0.25 – 0.15 = 0.10 N. Wt. in paraffin oil = 0.17 N. .. loss in wt.in oil = upthrust...Products
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