| ⇦ | 
| ⇨ |
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: - The drift speed of electrons in copper wire of diameter and length l is v.
- A current is flowing through resistance. A potential difference of 120 V
- “On flowing current in a conducting wire the magnetic field is produced around it”.
- A train of mass 2x 10⁵ kg has a constant speed of 20 m/s up a hill inclined
- Three masses are placed on the x-axis : 300 g at origin, 500 g at x = 40 cm
Topics: Motion in Straight Line
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The drift speed of electrons in copper wire of diameter and length l is v.
- A current is flowing through resistance. A potential difference of 120 V
- “On flowing current in a conducting wire the magnetic field is produced around it”.
- A train of mass 2x 10⁵ kg has a constant speed of 20 m/s up a hill inclined
- Three masses are placed on the x-axis : 300 g at origin, 500 g at x = 40 cm
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