Mechanical energy can be either
A. kinetic or electric B. chemical or potential C. potential or kinetic? D. electric or heat Correct Answer: Option C C. potential or kinetic?A plane inclined at 30o to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly on the plane
A. 50.0N B. 120.0N C. 200.0N D. 240N Correct Answer: Option B B. 120.0N Explanation V.R = 1/sinθ=1/sin30 = 2 M.A = (E×V.R)/100=(50×2)/100 =1 Effort = load/M.A =120/1 =120NA car of mass 800kg moves from rest on a horizontal track and travels 60m in 20s with uniform acceleration. Assuming there were no frictional forces, calculate the accelerating force
A. 240.0N B. 800.0N C. 1600.00N D. 2400.0N Correct Answer: Option A A. 240.0N Explanation S = at + ½at² 60 = 0 x 20 + ½ x a x 20 a = 310m/s² F = ma = 800 x 310=240NAn external force of magnitude 100N acts on a particle of mass 0.15kg for 0.03s. Calculate the change in the speed of the particle
A. 50ms‾¹ B. 25ms‾¹ C. 20ms‾¹ D. 5ms‾¹ Correct Answer: Option C C. 20ms‾¹ Explanation a = F/m=1000.15=666.7 v = u + at = 0 + 66.7 x 0.03 = 20m/s²Products
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