72.
The Law of Polygon of Forces states that

76.
A train weighing 196 tonnes experiences a frictional resistance of $$5\frac{{11}}{{22}}$$  per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is

77.
A trolley wire weighs 1 kg per metre length. The ends of the wire are attached to two poles 20 m apart. If the horizontal tension is 1000 kg, the central dip of the cable is

78.
A particle moves along a straight line such that distance ‘x’ traversed in ‘t’ seconds is given by x = t2(t + 1), the acceleration of the particle, will be

80.
The forces which meet at one point and have their lines of action in different planes are called

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