Engineering Mechanics - Mechanical Engineering Questions and Answers

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Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

upwards

downwards

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According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then

their algebraic sum is zero

their lines of action are at equal distances

the algebraic sum of their moments about any point in their plane is zero

the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.

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If u₁ and u₂ are the velocities of two moving bodies in the same direction before impact and v₁ and v₂ are their velocities after impact, then coefficient of restitution is given by

\(\frac { v_1-v_2 } { u_1 - u_2 } \)

\(\frac { v_2 - v_1} { u_2 - u_1} \)

\(\frac { u_1 - u_2 } { v_1-v_2 } \)

\(\frac { u_2 + u_1 } { v_2 + v_1 }\)

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Two bodies of masses m₁,and m₂ are hung from the ends of a rope, passing oyer a frictionless pulley as shown in the figure below. The acceleration of the string will be

\(\frac { g (m_1 - m_2) } { m_1 + m_2 }\)

\(\frac { 2g (m_1 - m_2) } { m_1 + m_2 }\)

\( \frac { g (m_1 + m_2) } { m_1 - m_2 }\)

\(\frac { 2g (m_1 + m_2) } { m_1 - m_2 }\)