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The mechanical advantage of a wheel axle is 5. What will be the force required to lift a 200 kg wt?
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Important Questions on Laws of Motion
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A string of length and mass is lying on a horizontal table. A force is applied at one of its ends. Tension in the string at a distance from the end at which force is applied is
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A block is dragged on a smooth plane with the help of a rope which moves with a velocity as shown in figure. The horizontal velocity of the block is
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In the figure the ends P and Q of an unstrechable string move downward with uniform speed v. Mass M moves upwards with speed. 
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The frictional force of the air on a body of mass 0.25 kg, falling with an accleration of 9.2 m/s2, will be
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A block of mass 15 kg is placed on a long trolley. The coefficient of friction between the block and trolley is 0.18. The trolley accelerates from rest with 0.5 m/s2 for 20 s. then what is the friction force ?
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A pump is used to deliver water at a certain rate from a given pipe. To obtain n times water from the same pipe in the same time, by what factor, the force of the motor should be increased?
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A boy holds a pendulum in his hand while standing at the edge of a circular platform of radius r rotating at an angular speed . The pendulum will hang ai an angle with the vertical so that :
(Neglect length of pendulum)
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One end of a uniform wire of length and weight is attached rigidly to a point in the roof and weight is suspended from its lower end. If is the area of cross-section of the wire, the stress in the wire at a height of from its lower end is
