For =450 Θ H = u2 /4g = 1/4 of the Rmax. Q6. State the parallelogram law of vector addition. Derive an expression for magnitude and direction of resultant of the two vectors. Ans. The addition of two vector and is resultant = + And R = ( A2 + B2+ 2AB CosΘ)1/2 And tan = B SinΘ/ ( A + B CosΘ) , β is the angle between vector and vector , And is the angle which makes with the Θ β direction of . Q7. A gunman always keeps his gun slightly tilted above the line of sight while shooting. Why, Ans. Because bullet follow parabolic trajectory constant downward acceleration. Q8. Derive the relation between linear velocity and angular velocity. Ans : Derive the expression V = r ω Q9. What do you mean by rectangular components of a vector? Explain how a vector can be resolved into two rectangular components in a plane . Q10. The greatest height to which a man can a stone is h, what will be the longest distance upto which he can throw the stone ? Ans: we know that Hmax.= Rmax /2 So h = R/2 Or R = 2h Short answer questions (3 marks)
For Θ =450 H = u2 /4g = 1/4 of the Rmax. Q6. State the parallelogram law of vector addition. Derive an expression for magnitude and direction of resultant of the two vectors. Ans. The addition of two vector and is resultant = + And R = ( A2 + B2+ 2AB CosΘ)1/2 And tan β = B SinΘ/ ( A + B CosΘ) , Θ is the angle between vector and vector , And β is the angle which makes with the direction of . Q7. A gunman always keeps his gun slightly tilted above the line of sight while shooting. Why, Ans. Because bullet follow parabolic trajectory constant downward acceleration. Q8. Derive the relation between linear velocity and angular velocity. Ans : Derive the expression V = r ω Q9. What do you mean by rectangular components of a vector? Explain how a vector can be resolved into two rectangular components in a plane . Q10. The greatest height to which a man can a stone is h, what will be the longest distance upto which he can throw the stone ? Ans: we know that Hmax.= Rmax /2 So h = R/2 Or R = 2h Short answer questions (3 marks)
CLASS%20XI%20PHYSICS.docx