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The ratio of angular speeds of minute hands and hour hand of a watch isCorrectIncorrect
A particle of mass m is rotating in a plane in circular path of radius r.Its angular momentum is L. The Centripetal Force acting on particle isCorrectIncorrect
When a disc rotating with angular velocity ω , a particle situated at a distance of 4cm just begins to slip .If the angular velocity is doubled ,at what distance will the particle start to slip?CorrectIncorrect
A ball of mass 0.25 kg attached to the end of string of length 1.96m is moving in a horizontal circle. The String will break if the tension is more than 25N. What is the maximum speed with which ball can be moved?CorrectIncorrect
If a particle is moving in a circular path of radius ‘r’ with a uniform speed ‘v’ ,then the angle described by it one second will beCorrectIncorrect
A toy cart is tied to the end of an unstretched string of length . When revolved, the toy cart moves in horizontal circle with radius and time period . If it is speeded until it moves in horizontal circle of radius with period , relation between and is______. (Hooke’s law is obeyed)CorrectIncorrect
The maximum speed of a car on a road turn of radius , if the coefficient of friction between the tyres and the road is , will beCorrectIncorrect
A ceiling fan rotates about its own axis with some angular velocity. When the fan is switched off, the angular velocity becomes of the original in time and revolutions are made in that time. The number of revolutions made by the fan during the time interval between switch off and rest are (Angular retardation is uniform).CorrectIncorrect
A mass attached to once end of a string crosses top-most point on a vertical circle with critical speed. Its centripetal acceleration when string becomes horizontal will be (g = gravitational acceleration)CorrectIncorrect
A stone of mass 1kg is tied to the end of a string of 2 metre long and rotated at constant speed of 40 m/s in a vertical circle . The ratio of tension at the top and bottom is (take g= 10)CorrectIncorrect