Newton's Laws of Motion PYQs Set 7 (PDF)

Set 7 of 7 · Questions 181-185 of 185

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Mere Teacher · Previous Year Questions NEET Physics · Newton's Laws of Motion · Set 7 (Q181-185)
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181. $The initial mass of a rocket is 1000kg. Calculate at what rate the fuel should be burnt so that the rocket is given an acceleration of 20 m s^{- 2} . The gases come out at a relative speed of 500 m s^{- 1} with respect to the rocket:[Use g = 10 m / s^{2}]$ (1) $6.0 \times 1 0^{2} kg s^{- 1}$ (2) $500 kg s^{- 1}$ (3) $10 kg s^{- 1}$ (4) $60 kg s^{- 1}$ 182. $A mass of 10 kg is suspended vertically by a rope form the roof. When a horizontal force is applied on the rope at some point, the rope deviated at an angle of 45º at the roof point. If the suspended mass is at equilibrium, the magnitude of the force applied is (g = 10 m s^{- 2})$ (1) $200 N$ (2) $100 N$ (3) $140 N$ (4) $70 N$ 183. $A force vector applied on a mass is represented as F = 6 i - 8 j + 10 k and accelerates with 1 m / s^{2} . What will be the mass of the body?$ (1) $10 kg$ (2) $20 kg$ (3) $102 kg$ (4) $210 kg$ 184. $Two forces with equal magnitudes F act on a body and the magnitude of the resultant force is F/3. The angle between the two forces is$ (1) $cos^{- 1} (- \frac{17}{18})$ (2) $cos^{- 1} (- \frac{1}{3})$ (3) $cos^{- 1} (\frac{2}{3})$ (4) $cos^{- 1} (\frac{8}{9})$ 185. $A light spring of spring constant k is cut into two equal halves. Each half is connected in Parallel then net spring constant of the combination is$ (1) $\frac{k}{4}$ (2) $\frac{k}{2}$ (3) $2k$ (4) $4k$