Weight = mass x gravity
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While just holding the weight on his shoulder, the weight lifter does no work! For work to be done, the mass must be moved through a distance … No Movement, No Work! (but don't tell that to a weight lifter …)
Weight is mass times acceleration due to gravity.
The tin weight is 7g !
You cannot. You do not have the necessary information.
Weight = m g = (3) (9.8) = 29.4 newtons (6.61 pounds)