A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine?
A. 0.50 B. 0.63 C. 0.80 D. 1.60 Correct Answer: Option B B. 0.63A stone of mass 0.5kg is dropped from a height of 12m. Calculate its maximum kinetic energy. [g = 10ms‾¹]
A. 3.0J B. 6.0J C. 30.0j D. 60.0J Correct Answer: Option D D. 60.0J Explanation K.E = P.E = mgh = 0.5 x 10 x 12 = 60JElectric energy is measured in?
A. ampere B. coulomb C. kilowatt-hour D. kilowatt Correct Answer: Option C C. kilowatt-hourA body of mass 5kg moving with a velocity of 30ms‾¹ due east is suddenly hit by another body and changes its velocity to 50ms‾¹ in the same direction. Calculate the magnitude of the impulse received.
A. 100Ns B. 150Ns C. 250Ns D. 400Ns Correct Answer: Option A A. 100Ns Explanation I = Ft = m(v – u) = 5(50 – 30) = 100Products
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