![A 20kg mass is to be pulled up a slope inclined at 30° to the horizontal. If the efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms−²]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
by Sunday | Nov 1 | Physics JAMB
A. 87N B. 73.5N C. 133.3N D. 533.2N Correct Answer: Option C – 133.3N Explanation V. R = 1/Sinθ m = 20kg V.R = 1/Sin30 = 2 Efficiency = 75% Load = mg = 20 x 10 = 200N Efficiency = M.A/V.R×100 75/100 = M.A/2 M .A = 75×2/100 M. A = 1.5 Since M. A. = Load/Force...
by Sunday | Nov 1 | Physics JAMB
A. 0.8Ns B. 1.2Ns C. 12.0Ns D. 80.0Ns Correct Answer: Option A = 0.8Ns Explanation Momentum = Mass x Velocity Change in Momentum = Mass x (change in velocity) Change in Momentum = Mass x (v – u) Mass = 100g = 0.1kg U = 2ms−¹ V = 10ms−¹ Change in momentum = m (v...
by Sunday | Nov 1 | Physics JAMB
A. Adhesive B. Cohesive C. Magnetic D. Repulsive Correct Answer: Option A – Adhesive Explanation The term Adhesive forces refers to the attractive forces between unlike substance
by Sunday | Nov 1 | Physics JAMB
A. 0kgm B. 2kgm/s C. 4kgm/s D. 8kgm/s Correct Answer: Option D – 8kgm/s Explanation Initial momentum = (0.8) × (5) = 4.0kgms−1 Final momentum = (0.8) × (– 5) = – 4.0kgms−1 Impulse on ball = Change in momentum = 4.0 – (– 4.0) =...
by Sunday | Nov 1 | Physics JAMB
A. An electron B. An ion C. A neutron D. A proton Correct Answer: Option B – An ion Explanation If an atom gains or loses an electron, it becomes an ion. An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a...
Land Law and the Consequences of Unauthorized Land Transfers in Nigeria
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