JAMB Physics 2015 Objective — Question 30
Question 30 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2015 Objective paper, with the correct answer and a full explanation.
Advertisement
A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from a distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?
- A. 25cm
- B. 30cm
- C. 20cmCorrect
- D. 10cm
Explanation
By the principle of moments: 10×30 = 15×d ⟹ d = 300/15 = 20cm.
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.