| ⇦ | 
| ⇨ |
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: - In a transistor the collector current is always less than the emitter current
- A thin rod of length L and mass M is held vertically with one end on the floor
- On adjusting the P-N junction diode in forward bias,
- Two balls of mass m₁ and m₂ are separated from each other by powder charge
- For CE transistor amplifier, the audio signal voltage across the collector resistance
Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In a transistor the collector current is always less than the emitter current
- A thin rod of length L and mass M is held vertically with one end on the floor
- On adjusting the P-N junction diode in forward bias,
- Two balls of mass m₁ and m₂ are separated from each other by powder charge
- For CE transistor amplifier, the audio signal voltage across the collector resistance
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