JAMB Physics 2017 Objective — Question 29
Question 29 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2017 Objective paper, with the correct answer and a full explanation.
Advertisement
A block and tackle pulley arrangement has 6 pulleys, in which an effort of 50N supports a load of 200N. Calculate the efficiency of the machine.
- A. A. 80.0%
- B. B. 76.6%
- C. C. 66.7%Correct
- D. D. 60.7%
Explanation
V.R = number of pulleys = 6; M.A = Load/Effort = 200/50 = 4. Efficiency = M.A/V.R x100% = 4/6x100 = 66.7%.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.