24. A water jet whose cross section area is a striker wall making an angle e...

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24. A water jet whose cross section area is a striker wall making an angle e with the normal and rebounds elastically. The velocity of water of density d is v. Force exerted on wall is :- 0 (1) 2avd cos 0 (2) 2avd sin 0 (3) 2avd cos 0 (4) avd cos 0 25. Two blocks of masses 5 kg and 10 kg are connected to a pulley as shown. What will be their acceleration if the pulley is set free? (g = acceleration due to gravity) (1) g (3) g/3 5 kg 10 kg (2) g/2 (4) g/4 26. Figure shows three blocks in contact and kept on a smooth horizontal surface. What is ratio of force exerted by block A on B to that of B on C :- (1) 1:2 (3) 1:3 F=16N A B 5kg 2kg 1kg (2) 2:1 (4) 3:1 27. If a = 2, b = 5 and | a 5 = 8 then a B is (1) 6 (2) 12 (3) 9 (4) 4 28. If A = 1 + 2j + 3k, B = 1 + j + 4k and C = 31 - 3 - 12k, then find the angle between the vectors (A + B + c) and (A x B). (1) 0 (3) 90 (2) 180 (4) 60 24. A water jet whose cross section area is a striker wall making an angle e with the normal and rebounds elastically. The velocity of water of density d is v. Force exerted on wall is :- 0 (1) 2avd cos 0 (2) 2avd sin 0 (3) 2avd cos 0 (4) avd cos 0 25. Two blocks of masses 5 kg and 10 kg are connected to a pulley as shown. What will be their acceleration if the pulley is set free? (g = acceleration due to gravity) (1) g (3) g/3 5 kg 10 kg (2) g/2 (4) g/4 26. Figure shows three blocks in contact and kept on a smooth horizontal surface. What is ratio of force exerted by block A on B to that of B on C :- (1) 1:2 (3) 1:3 F=16N A B 5kg 2kg 1kg (2) 2:1 (4) 3:1 27. If a = 2, b = 5 and | a 5 = 8 then a B is (1) 6 (2) 12 (3) 9 (4) 4 28. If A = 1 + 2j + 3k, B = 1 + j + 4k and C = 31 - 3 - 12k, then find the angle between the vectors (A + B + c) and (A x B). (1) 0 (3) 90 (2) 180 (4) 60

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24 When a water jet strikes a wall and rebounds elastically the force exerted on the wall can be determined using the principle of conservation of momentum The momentum of the water jet before strikin... View the full answer