A load of mass 120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms‾²]
A. 60W B. 80W C. 100W D. 120W Correct Answer: Option B B. 80W Explanation p = mgh/t=(120×10×2)/30 = 80WWhich of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved
A. parallel to the line of action of the force from a reference point B. perpendicular to the line of action of the force from a reference point C. on a line through the reference point D. by the object Correct Answer: Option A A. parallel to the line of action of the...In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms‾²]
A. 0.280kg B. 0.400kg C. 0.613kg D. 0.800kg Correct Answer: Option D Explanation m = (0.7×40)/35 =0.8kgA spiral spring of natural length 30.0cm and force constant of 20Nm‾¹ is compressed to 20.0cm. Calculate the energy stored in the spring
A. 0.1J B. 1.0J C. 10.0J D. 100.0J Correct Answer: Option A Explanation Energy = ½ke²=½ × 20×0.1² = 0.1JProducts
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