| ⇦ | 
| ⇨ |
A body of mass 2 kg travels according to the law x(t)=pt+qt²+rt³,where p=3 m/s,q=4 m/s² and r=5 m/s³.The force acting on the body at t=2 s is
Options
(a) 136 N
(b) 134 N
(c) 158 N
(d) 68 N
Correct Answer:
136 N
Explanation:
m = 2 kg, x = pt + qt² + rt³
⇒ dx/dt = p + 2qt + 3rt²
d²x/dt² = 2q + 6rt = acceleration(a)
At t=2s,
a = 2q +12r = 2 x 4 + 12 x 5
= 68 m/s²
F=ma = 2 x 68 = 136 N.
Related Questions: - A,B and C are voltmeters of resistance R, 1.5 R and 3R respectively, as shown
- The momentum is most closely related to
- A radioactive substance has a half-life of four months. Three-fourth of substance
- Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10⁻² C
- A ship A is moving westwards with a speed of 10 km/h and a ship B 100 km
Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A,B and C are voltmeters of resistance R, 1.5 R and 3R respectively, as shown
- The momentum is most closely related to
- A radioactive substance has a half-life of four months. Three-fourth of substance
- Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10⁻² C
- A ship A is moving westwards with a speed of 10 km/h and a ship B 100 km
Topics: Laws of Motion (103)
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