| ⇦ | 
| ⇨ |
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: - At absolute temperature, the kinetic energy of the molecules
- A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis
- If the feedback voltage is increased in a negative feedback amplifier, then
- The radius of a nucleus of mass number A is directly proportional to
- The energy required to charge a parallel plate condenser of plate separation d
Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- At absolute temperature, the kinetic energy of the molecules
- A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis
- If the feedback voltage is increased in a negative feedback amplifier, then
- The radius of a nucleus of mass number A is directly proportional to
- The energy required to charge a parallel plate condenser of plate separation d
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