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# PHYSICS5 - Competition in Physics(Sample Questions Multiple...

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Competition in Physics (Sample Questions) Multiple Choice Part 1) Given the vectors A =2 i +3 j, B = i - j ( i and j are unit vectors in the x and y directions respectively) and C=A+B, the magnitude of C is (A) 5 (B) 13 (C) 10 (D) none of the above 2) For the same two vectors in 1), A B, the dot product of A and B, is 3) An object moving in a circular path with constant speed on a plane has 4) A block of mass m is pulled at constant velocity over a floor by a force T inclined at an angle θ with the floor as shown. The magnitude of the vertical component of the force exerted on the block by the floor is 5) A cart of mass 2M has a velocity v o before it strikes another cart of mass 3M at rest, as shown below. The two carts couple and move together with a velocity give by (A) (1/5) v o (B) (2/5) v o (C) (3/5) v o (D) (2/3) v o T θ 2M 3M v o

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