M1 Help - Slopes
Hi, can anyone help me with part (ii) of this question.. this is what I've got and after that I'm stumped! Thanks!
P cos 60º = Fr + 30 g sin 60º
R = P sin 60º + 30 g cos 60º
Original post by clarewithnoi
Hi, can anyone help me with part (ii) of this question.. this is what I've got and after that I'm stumped! Thanks!
P cos 60º = Fr + 30 g sin 60º
R = P sin 60º + 30 g cos 60º
Hi, can anyone help me with part (ii) of this question.. this is what I've got and after that I'm stumped! Thanks!
P cos 60º = Fr + 30 g sin 60º
R = P sin 60º + 30 g cos 60º
Fr = mu R
Original post by TenOfThem
Fr = mu R
I tried that but I ended up wit 1900N when the answer was 1440N
Do you have to rearrange the equations or something? I'm so confused!Original post by clarewithnoi
I tried that but I ended up wit 1900N when the answer was 1440N Do you have to rearrange the equations or something? I'm so confused!
Do you have to rearrange the equations or something? I'm so confused!yep
Used your equations
1440
Original post by TenOfThem
yep
Used your equations
1440
Used your equations
1440
I'm still getting the wrong answer! I just checked the markscheme, the only part I didn't get was 15g root 3 and 15g in my equations, can you explain where they came from?
Original post by clarewithnoi
I'm still getting the wrong answer! I just checked the markscheme, the only part I didn't get was 15g root 3 and 15g in my equations, can you explain where they came from?
The fact that cos(30) = root3 / 2
(edited 10 years ago)
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