Board Competitive Exams 41 Two projectiles of same mass and with same velocity are thrown at an angle 60 and 30 with the

Question

Board Competitive Exams 41 Two projectiles of same mass and with same velocity are thrown at an angle 60 and 30 with the horizontal then which will remain same 1 Time of flight 2 Range of projectile 3 Maximum height acquired 4 All of these 42 Two particles having mass M and m are moving in a circular path having radius R and r If their time periods are same then the ratio of their angular velocities will be 3 1 43 If A B A 181 and B will be 1 90 3 0 R 4 then angle between A 2 120 4 60 44 A particle moves along a circle of radius with constant tangential acceleration If the velocity of the particle is 80 m s at the end of the second revolution after motion has begun the tangential acceleration is 1 40 m s 2 640 m s 4 40 m s 3 160 m s 45 The vector sum of two forces is perpendicular to their vector differences In that case the forces 1 Are equal to each other 2 Are equal to each other in magnitude 3 Are not equal to each other in magnitude 4 Cannot be predicted 46 A wheel has angular acceleration of 3 0 rad s and an initial angular speed of 2 00 rad s In a time of 2 s it has rotated through an angle in radian of 1 10 2 12 3 4 m 47 A particle is moving such that its position coordinates x y are 2 m 3 m at time t 0 6 m 7 m at time t 2 s and 13 m 14 m at time t 5 s 1 2 SECTION D Assertion Reason Type Questions In the following questions a statement of assertion A is followed by a statement of reason R 3 Motion in a Plane 225 Average velocity vector V from t 0 to f 5 s is 1 13 147 3 2 1 1 5 1 If both Assertion Reason are true and the reason is the correct explanation of the assertion then mark 1 2 If both Assertion Reason are true but the reason is not the correct explanation of the assertion then mark 2 3 If Assertion is true statement but Reason is false then mark 3 4 If both Assertion and Reason are false statements then mark 4 A If ALB then A BI IA BI R If ALB then A B is perpendicular to A B A The addition of two vectors P and Q is commutative R By triangle law of vector addition we can prove P Q Q P A A vector cannot be divided by other vector R A vector can be divided by a scalar 4 A At the highest point the velocity of projectile is zero R At maximum height projectile comes to rest A Horizontal range of a projectile is always same for angle of projection with horizontal or 0 with vertical R Horizontal range depends only on angle of projection

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