Theory of Machine
In a simple harmonic motion, the velocity vector with respect to displacement vector

Is in phase
Lags by 90°
Leads by 180°
Leads by 90°

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Theory of Machine
Which of the following is false statement in respect of differences between machine and structure?

Machines transmit mechanical work, whereas structures transmit forces
Machines modify movement and work, whereas structures modify forces
In machines, relative motion exists between its members, whereas same does not exist in case of structures
Efficiency of machines as well as structures is below 100 %

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