The friction of the air causes a vertical retardation equal to 10%

The Friction Of The Air Causes A Vertical Retardation Equal Physics Question

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:

  1. A bar magnet of pole strength 10 A-m is cut into two equal parts breadthwise.
  2. The order of the electric field near the earth’s surface is
  3. A proton is moving in a uniform magnetic field B in a circular path of radius a
  4. 34 gram of water at 30⁰C is poured into a calorimeter at 15⁰C.
  5. The ultimate individual unit of magnetism in any magnet is called

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*