// Numbas version: exam_results_page_options {"name": "Set Soal Matematika IIB - Bab 8 - 10", "metadata": {"description": "", "licence": "None specified"}, "duration": 3600, "percentPass": 0, "showQuestionGroupNames": false, "showstudentname": true, "question_groups": [{"name": "PG + Isian", "pickingStrategy": "all-shuffled", "pickQuestions": 1, "questionNames": ["", "", "", "", "", ""], "questions": [{"name": "Mat 2B - UAS - No 1", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Meong Meong Project", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4687/"}], "tags": [], "metadata": {"description": "", "licence": "None specified"}, "statement": "

Agar $\\displaystyle \\lim\\limits_{(x,y)\\to(\\var{a},a)}\\dfrac{\\simplify{x*y-b*y-{a}*x+{a}*b}}{\\simplify{{b}x-{b}*{a}}}=\\var{c}$, maka nilai $a$ dan $b$ berturut-turut adalah $\\ldots$.

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Misal $A$ dan $B$ adalah matriks persegi berukuran $\\var{b}\\times \\var{b}$ dengan $\\det(A)=\\var{a}$ dan $\\det(B)=\\var{a*b}$.

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Seluruh pernyataan berikut benar, kecuali $\\ldots$.

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Pilihlah seluruh matriks $A$ agar sistem persamaan diferensial $\\dfrac{d\\mathbf{x}}{dt}=A\\mathbf{x}$ mempunyai titik kesetimbangan di $(0,0)$ yang bersifat stabil.

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Nilai maksimum dari fungsi $f(x,y)=xy^{\\var{a}}$ pada lingkaran $x^2+y^2=\\var{b^2}$ adalah $\\ldots$.

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Petunjuk: Suatu persamaan parametrik untuk lingkaran $x^2+y^2=r^2$ adalah $x(t)=r\\cos(t)$, $y(t)=r\\sin(t)$, $t\\in[0,2\\pi]$.

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Turunan berarah fungsi $f$ di titik $(7,24)$ dalam arah $\\mathbf{u}=5\\mathbf{i}+12\\mathbf{j}$ adalah $D_{\\mathbf{u}}f(7,24)=\\var{5*a+12*b}k$ dan dalam arah $\\mathbf{v}=5\\mathbf{i}-12\\mathbf{j}$ adalah $D_{\\mathbf{v}}f(7,24)=\\var{5*a-12*b}k$.

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Di titik tersebut, turunan berarah fungsi $f$ dalam arah $\\mathbf{w}=4\\mathbf{i}+3\\mathbf{j}$ adalah $D_{\\mathbf{w}}f(7,24)=\\dfrac{ak}{65}$ dengan $a=\\ldots$.

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Model matriks teriterasi suatu populasi membagi populasi menjadi 3 subpopulasi. Jika $\\mathbf{p}_{t+1}=\\begin{bmatrix} 1 & \\var{a} & 1 \\\\ 0 & 3 & \\var{a} \\\\ 0 & 0 & 2 \\end{bmatrix}\\mathbf{p}_t$, maka dalam jangka panjang, perbandingan banyaknya subpopulasi $1$ dan $2$ adalah $1:b$ dengan $b=\\ldots$.

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Petunjuk: Jika dibutuhkan, tuliskan nilai $b$ dalam bentuk pecahan paling sederhana.

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Suatu model sistem persamaan diferensial untuk model kecukupan vaksinasi suatu wabah adalah

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$\\begin{cases} \\dfrac{dN}{dt} &= 2(1-p)N+2(1-p)V-N \\\\ \\dfrac{dV}{dt} &= 2pV+2pN-3V \\end{cases}$

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dengan $N$ menyatakan banyaknya orang yang belum divaksin, $V$ menyatakan banyaknya orang yang divaksin, serta $p$ adalah fraksi populasi yang telah divaksin.

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Perhatikan bahwa titik kesetimbangan model ini adalah di $(0,0)$. Tentukan nilai $p$ terkecil agar titik kesetimbangan ini bersifat stabil. Tuliskan nilainya dalam bentuk pecahan paling sederhana.

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Catatan: Nilai $p$ ini disebut juga dengan nilai kritis, yaitu nilai yang dibutuhkan agar wabah dapat mereda.

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Petunjuk: Karena $p$ menyatakan fraksi, maka $p\\in[0,1]$.

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Misal $\\mathbf{x}(t)=\\begin{bmatrix} N(t) \\\\ V(t) \\end{bmatrix}$. Dengan menggunakan $p=\\dfrac{15}{16}$, jika diberikan nilai awal $N(0)=\\var{k}$ dan $V(0)=0$, maka solusi khusus dari sistem persamaan diferensial tersebut adalah $\\mathbf{x}(t)=\\begin{bmatrix} c_1e^{\\lambda_1t}+c_2e^{\\lambda_2t} \\\\ c_3e^{\\lambda_1t}+ c_4e^{\\lambda_2t} \\end{bmatrix}$.

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Maka $c_1+c_2+c_3+c_4=\\ldots$.

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Mengacu pada solusi (b), $\\displaystyle \\lim\\limits_{t\\to\\infty}\\dfrac{V(t)}{N(t)} = \\ldots$.

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Waktunya 5 menit lagi ya.

"}}, "feedback": {"showactualmark": false, "showtotalmark": false, "showanswerstate": false, "allowrevealanswer": false, "advicethreshold": 0, "intro": "

Selamat datang!

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Silakan gunakan set soal ini dengan bijak. Kalian bisa mencoba set soal ini terus-menerus.

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Set soal ini dapat digunakan oleh siapapun secara gratis.

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Petunjuk pengerjaan soal:

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Jika ada kunci jawaban yang salah, kalian dapat memberitahu kami di Instagram @meongmeongproject atau OA Line @eog7710d.

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