| ⇦ | 
| ⇨ |
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: - Which one of the following bonds produces a solid that reflects light in the visible region
- The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
- A vertical spring with force constant k is fixed on a table. A ball of mass
- A speeding motorcyclist sees traffic jam ahead him. He slows down to 36 km per hour
- For transistor action (1) Base, emitter and collector regions should have similar size
Topics: Motion in Straight Line
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which one of the following bonds produces a solid that reflects light in the visible region
- The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
- A vertical spring with force constant k is fixed on a table. A ball of mass
- A speeding motorcyclist sees traffic jam ahead him. He slows down to 36 km per hour
- For transistor action (1) Base, emitter and collector regions should have similar size
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