| ⇦ | 
| ⇨ |
The friction of the air causes a vertical retardation equal to 10% of the acceleration due to gravity (take g=10 ms⁻²). The maximum height will be decreased by
Options
(a) 8%
(b) 9%
(c) 10%
(d) 11%
Correct Answer:
9%
Explanation:
Retardation due to friction of air = 8/10. Hence, in upward motion
Total retardation = g + (8/10) = 11g / 10
.·. H(m) = u² sin² θ / 2g
H(m)’ = u² sin² θ / 2×(11g/10) = (10/11)×(u² sin² θ / 2g) = (10/11) H(m)
.·. % decreases in H(m) = {[H(m) – H(m)’] / H(m)} × 100
= [1 – (10/11)] × 100 = 9%
Related Questions: - “On flowing current in a conducting wire the magnetic field is produced around it”.
- If the radioactive dacay constant of radium is 1.07 x 10⁻⁴ year⁻¹, then its half-life
- A metal conductor of length 1m rotates vertically about one of its ends at angular
- A step-down transformer has 50 turns on secondary and 1000 turns on primary winding.
- A body is hangfing from a rigid support by an inextensible string of length
Topics: Motion in Straight Line
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- “On flowing current in a conducting wire the magnetic field is produced around it”.
- If the radioactive dacay constant of radium is 1.07 x 10⁻⁴ year⁻¹, then its half-life
- A metal conductor of length 1m rotates vertically about one of its ends at angular
- A step-down transformer has 50 turns on secondary and 1000 turns on primary winding.
- A body is hangfing from a rigid support by an inextensible string of length
Topics: Motion in Straight Line (93)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply