NEET Physics Laws of Motion Questions Solved


For a rocket moving in free space, the fraction of mass to be disposed off to attain a speed equal to two times the exhaust speed is given by (given e -7.4) (a) 0.63 (b) 0.37 (c) 0.50 (d) 0.86

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(2)

 

                            

If acceleration of wedge is 'a'From wedge frame:

                           

Block is in equilibrium   ma cos θ=mg sin θ        a=g tan θ        a=g34           tan 37°=34   For whole system,          Mg=M+4+1a     asys=Net driving forceMass of system          Mg=M+53g4              4M=3M+15               M=15 kg

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(3)

                               

Length of the element = R×2θMass of full length = mMass of unit length = m2πRMass of the element = m2πR×R×2θ                              dm =mπ×θ

2TSinθ=dmv2R= mπ×θ×v2RAs, θ is very small, Sinθθ 2=mπ×θ×v2R       T=mv22πR

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