Applied Mechanics and Graphic Statics
A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length

Must be increased
Must be decreased
Is not changed but weight of the bob is decreased
Is not changed but weight of the bob is increased

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Applied Mechanics and Graphic Statics
When a body of mass M1 is hanging freely and another of mass M2 lying on a smooth inclined plane(α) are connected by a light index tensile string passing over a smooth pulley, the acceleration of the body of mass M1, will be given by

g(M2 + M1 sin α)/(M1 + M2­) m/sec²
g(M1 - M2 sin α)/(M1 + M2­) m/sec²
g(M1 + M2 sin α)/(M1 + M2­) m/sec
g(M2 × M1 sin α)/(M2 - M1­) m/sec²

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