We can not open or close the door by applying force at the hinges why ?
Is it necessary that a mass should be present at the centre of mass of any system
Can a simple pendulum be used in an artificial satellite.
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To open or close a door, we apply a force normal to the door. ... If the force is applied at the hinges the perpendicular distance of force is zero. Hence, there will be no turning effect however large force is applied
No, there need not be any mass at the centre of mass of a system. For example centre of mass of a ring lies at its centre where there is no mass
A simple pendulum cannot be used in an artificial satellite because: In an artificial satellite acceleration due to gravity is zero so the pendulum will not vibrate inside it. ... Pendulums are often used in clocks because they take the same amount of time to swing in both the directions
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