This question involves the concepts of frictional force and weight.
The magnitude of the force Q for which the drum just starts spinning is "750 N".
MAGNITUDE OF FORCE Q
The magnitude of force required must be equal to the frictional force between the drum and contact surface:
Q = μR
where,
- Q = magnitude of required force = ?
- μ = coefficient of static friction = 0.5
- R = Normal Reaction = Weight of drum = 1500 N
Therefore,
Q = (0.5)(1500 N)
Q = 750 N
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