The average size of a suitcase is 28 inches by 32 inches. Airlines restrict the size of a suitcase that can be carried on the airplane and the size that can be in the cargo hold. Usually, a bag that is 16 inches by 20 inches is the largest carry-on bag. The cargo hold cannot hold a suitcase that is larger than 63 inches long.
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To measure a suitcase, use a tape measure to determine the length, width, and height of the suitcase. Include both the wheels and handles in your measurements if they cannot be removed. Always refer to the airline's specific dimension requirements to ensure your suitcase is within their size limits.
In the metric system the most suitable measurement would be cm (centimeters). And you would use a measuring tape.
I would suggest the Kilogram would be the appropriate unit to use. Indeed this is what airlines quote.
Technically, no; work is performed when lifting the suitcase, but not when holding it level. Work IS performed to accelerate the suitcase at the beginning of the sprint, when turning or climbing stairs, and to slow it down at the end; but carrying the suitcase at a constant velocity and constant height is not "work".
Yes, the boy holding a suitcase in his hand is exerting force. The force he applies is in opposition to the force of gravity acting on the suitcase, allowing him to lift and support its weight.
A suitcase is a second-class lever because the load (suitcase contents) is between the fulcrum (hinge or handle) and the effort (force applied to lift or carry the suitcase). This lever arrangement allows for increased mechanical advantage, making it easier to lift and carry the load.
A spiral suitcase is an example of an inclined plane simple machine. The spiral shape of the suitcase helps to minimize the effort required to lift and move it by converting a vertical movement into a longer, more gradual slope.
When you pull a suitcase with wheels, the force you apply is actually doing work only when it is in the direction of the motion of the suitcase. Any force applied in other directions, like lifting the suitcase off the ground or turning it, does not contribute to the work done on the suitcase. This is because work is defined as force exerted in the direction of the displacement.