IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: T.Q on December 13, 2009, 09:46:31 pm
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A post is driven into the ground by means of a blow from a pile-driver. The pile-driver falls
from rest from a height of 1.6 m above the top of the post.
(a) Show that the speed of the pile-driver just before it hits the post is 5.6 m s–1. (2 marks)
The post has mass 6 kg and the pile-driver has mass 78 kg. When the pile-driver hits the top
of the post, it is assumed that the there is no rebound and that both then move together with
the same speed.
(b) Find the speed of the pile-driver and the post immediately after the pile-driver has hit the
post. (3 marks)
The post is brought to rest by the action of a resistive force from the ground acting for 0.06 s. By modelling this force as constant throughout this time,
(c) find the magnitude of the resistive force, (4 marks)
(d) find, to 2 significant figures, the distance travelled by the post and the pile-driver before
they come to rest.(4 marks)
i need help in part C
By the way in the mark scheme the answer is F = 8103.2 N
i need to know the way we solve this question plz help
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When i get up
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check this
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8103.2N is the answer in the markscheme
i did it YAY!
astar used f=ma
f=84x86.7
f = 7282.8
i tried F-84g=84x260/3
F= 8103.2N
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How did i forget gravity
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plzxplain Q7-b) in same paper
http://freeexampapers.com/FreeExamPapers.com_.php?__lo=QSBMZXZlbC9NYXRocy9FZGV4Y2VsL00xL00xIE1vY2sucGRm
sry i cnt get da scaner 2 work :s
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thanx :)