Question

please help!!!will give medals.

Answer 1

the diagram shows a plank of mass 5.0kg and length 3.00m resting horizontally on two trestles, P and Q, which are a distance of 2,50m apart. When a student of mass 60.0kg walks along the plank from one trestle to the other, the plank sags.
(a)Explain why the sag increases as the student walks towards the middle of the plank.
(b)Calculate the downwards force exerted on each trestle when the student is a distance of:
(i) 0.50m from trestle P,
(ii) 1.25m from trestle P,
[g=10.0 N kg^-1]

Answer 2

the diagram shows a plank of mass 5.0kg and length 3.00m resting horizontally on two trestles, P and Q, which are a distance of 2.50m apart. When a student of mass 60.0kg walks along the plank from one trestle to the other, the plank sags.
(a)Explain why the sag increases as the student walks towards the middle of the plank.
(b)Calculate the downwards force exerted on each trestle when the student is a distance of:
(i) 0.50m from trestle P,
(ii) 1.25m from trestle P,
[g=10.0 N kg^-1]

Answer 3

(a) It increases because you are adding more pressure to it.
(b) 25, Divide 1.25 by 0.50 then multiply by 10.0.
Hope that helps...