| ⇦ | 
| ⇨ |
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: - An alternating electric field, of frequency v, is applied across the dees (radius = R)
- A block of mass m is moving on a wedge with the acceleration aᵒ
- An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series
- An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp
- A battery charges a parallel plate capacitor seperated by distance(d) so that the energy
Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An alternating electric field, of frequency v, is applied across the dees (radius = R)
- A block of mass m is moving on a wedge with the acceleration aᵒ
- An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series
- An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp
- A battery charges a parallel plate capacitor seperated by distance(d) so that the energy
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