10033 ` 4 ⋅ ∣⊡∣∎∎∎∥∎∣∣⊪∣∎∣∣∎

↿∆⋅∧⊔∏∎⋅↟∘↾∏↿∣∂↺⊄⊖⊺∘⇅∏↿∣⊖∏⊑⋔↾∊≊≖⊱∂⊊∂∎⋅⋂⋮↿∂⋁⊖⋂∣⋅∁∂∣⋁⋁∂∣∣↭∣⋅⇟↾↿⋁⋁↾↿∣⋅∁↾∥⋅≖⋂↴∂⇂≺⊝≘
an angle of 45°. The coefficient of friction between ladder and the wall is 0.4 and
that between ladder and the floor is 0.5. |! aman whose weight is one half that of
ladder climbs up then how high will it be when the ladder slips ?

SET 3 : Answer any 2 questions. Each question carries 10 Marks. (2x10=20 Marks)

15. Allift has an upward acceleration of 1.2m/s2. What force will a man weighing
750 N exert on the floor of the lift ? What force would he exert if the lift had an
acceleration of 1.2 m/s? downwards ۶ What upward acceleration would cause
his weight to exert a force of 900 N on the floor ?

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i 0 5
0 30° ।
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Fig. 7

In the reciprocating engine mechanism shown in Fig. 7, the crank OA rotates at
` 8 uniform speed of 300 rpm. The length of the crank and connecting rod are
12 cm and 50 cm respectively. Find the angular velocity of the connecting rod
and velocity of the piston when the crank makes an angle of 30° with horizontal.

17, A body moving with SHM, has an amplitude of 1 ന and period of oscillation is”
2 seconds. Find the velocity and acceleration of the body at t = 0.4 second ,
when the time is measured from mean position and extreme position ?