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Mini Exercise
(1) In a right angled triangle length of base is 4 cm and its perpendicular is 3 m. Find
(2) A force of 150 N can loosen a nut when applied at the end of a spanner 10cm long. What should be the length of the spanner to loosen the same nut with 60 N force? How much force would be sufficient to loosen it with a 6 cm long spanner?
(3) Can a small child play with a fat child on the see-saw? Explain how?
(4) Two children are sitting on the see-saw, such that they cannot swing. What is the net torque in this situation?
(5) A ladder leaning at a wall as shown in figure 4.31 is in equilibrium. How?
(6) The weight of the ladder in figure 4.31 produces an anticlockwise torque. The wall pushes the ladder at its top end thus produces a clockwise torque. Does the ladder satisfy the second condition for equilibrium?
(7) Does the speed of a ceiling fan go on increasing all the time?
(8) Does the fan satisfy the second condition for equilibrium when rotating with uniform speed?