All Mechanics DOUBTS HERE!!!

[astarmathsandphysics]

1st thing in morning

[falafail]

Someone help me with january 2009 Q7 (b)..

I have the mark scheme i just don't understand how they freakn get there =/

CIE or edexcel?

[Saladin]

Answering it soon.

[Sweet_03]

hello

M1 , jan2006
can someone please explain how to do :
all of Question 4
and Question 6 part (d) only
 

[Saladin]

Answering it soon.

Jan 2009 m1

7(b)

This is basically asking you to find the resistance force that R give Q. The thing thatprevents it from having an acceleration of 9.8 ms^-2

So

[halosh92]

M1 edexcel
jan 2001
Q6d
URGENT! thx

[Saladin]

M1 edexcel
jan 2001
Q6d
URGENT! thx

Post all your working upto 6 (c)

or else i will have to do the whole thing

[halosh92]

Post all your working upto 6 (c)

or else i will have to do the whole thing

sure

b) v=u +at
v=at
v = 9.8 *2 = 19.6 m/s

c) 1/2 * 2 *19.6 = 19.6m
1/2 * (19.6 + 4) *5 = 59
59 + 19.6= 78.6m

[astarmathsandphysics]

here

[halosh92]

sure

b) v=u +at
v=at
v = 9.8 *2 = 19.6 m/s

c) 1/2 * 2 *19.6 = 19.6m
1/2 * (19.6 + 4) *5 = 59
59 + 19.6= 78.6m

could someone solve this plz

[Phosu]

the distance that the helicopter is above the ground is 125m
this is the total distance under the graph, since its the total distance that the woman covers before reaching the ground
out of which 78.6m is the distance between the woman in air, and the helicopter

125=78.6+4T
4T=46.4
T=11.6

total time taken = 2+5+11.6=18.6s

[Ghost Of Highbury]

A load of weight 7kN is being raised from the rest with constant acceleration by a cable. After the load has been raised 20 metres, the cable suddenly becomes slack. The load continues to move upwards for a distance of 4 metres before coming to an instantaneous rest. Assume no air resistance, find the tension in the cable before it became slack.

[halosh92]

the distance that the helicopter is above the ground is 125m
this is the total distance under the graph, since its the total distance that the woman covers before reaching the ground
out of which 78.6m is the distance between the woman in air, and the helicopter

125=78.6+4T
4T=46.4
T=11.6

total time taken = 2+5+11.6=18.6s

how did u get this equation exactly??

[Phosu]

how did u get this equation exactly??

which one?
the calculation of T or the total time taken?

[halosh92]

which one?
the calculation of T or the total time taken?

no calculation for T