A machine whose efficiency is 60% has a velocity ratio of 5. If a force of 500N is applied to lift a load P; what is the magnitude of P?
A. 1500N B. 500N C. 4166N D. 750N Correct Answer: Option A – 1500N Explanation efficiency = (M.A / V.R) x 100/1 => 60/100 = M.A/5 ∴M.A = (60 X 5) / 100 = 3 But M.A = Load/Effort; => 3 = Load/500 ∴Load = 500 x 3 =...
A body of mass 4kg is acted on by a constant force of 12N for 3 seconds. The kinetic energy gained by the body at the end of the time is?
A. 144J B. 162J C. 81J D. 72J Correct Answer: Option B = 162J Explanation K.E = 1/2MV2 Force, F = ma => a = F/m = 12/4 = 3ms-2 But a = (V-U) / t => V = u + at If the initial velocity U = 0, then V = at = 3 x 3 = 9ms-2 ∴ K.E, = 1/2ms-2 1/2 4 x 9 x 9 =...
If the angle between two vector P and Q is O°; the vectors are said to?
A. intersect at the angle 45° B. intersect at the angle 60° C. be parallel D. be perpendicular Correct Answer: Option C – be parallel
To protect a material from the influence of an external magnetic field; the materials should be kept?
A. square steel ring B. triangular zinc ring C. soft iron ring D. loop of copper wire Correct Answer: Option C – soft iron ring Explanation In order to protect material from the influence of an external magnetic field, the material is placed in a soft iron ring,...Products
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