| ⇦ | 
| ⇨ |
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 Galilean telescope has an objective of focal length 100 cm and magnifying power 50
- The coefficient of performance of a Carnot refrigerator working between 30⁰C and 0⁰C is
- A particle of mass m moves with constant speed along a circular path of radius r under
- An electron moving in a uniform magnetic field of induction of intensity B,
- Two point charges +2 coulomb and +10 coulomb repel each other with a force of 12 N.
Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
- The coefficient of performance of a Carnot refrigerator working between 30⁰C and 0⁰C is
- A particle of mass m moves with constant speed along a circular path of radius r under
- An electron moving in a uniform magnetic field of induction of intensity B,
- Two point charges +2 coulomb and +10 coulomb repel each other with a force of 12 N.
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