⇦ | ⇨ |
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: - According to photon theory of light which of the following physical quantities,
- The primary and secondary coil of the transformer have 50 and 1500 turns respectively
- In common base circuit of a transistor, current amplification factor is 0.95.
- If by mistake voltmeter is connected in series and ammeter in parallel then
- In a parallel plate capacitor of capacitance C, a metal sheet is inserted
Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- According to photon theory of light which of the following physical quantities,
- The primary and secondary coil of the transformer have 50 and 1500 turns respectively
- In common base circuit of a transistor, current amplification factor is 0.95.
- If by mistake voltmeter is connected in series and ammeter in parallel then
- In a parallel plate capacitor of capacitance C, a metal sheet is inserted
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