150x2 because 15 minutes is half that of 30 =300 then times that by 2 again to get an hour so 600 then times 450 by 2 to get an hour so 900 then subtract 600 from 900 which is 300 300 more times is your answer
300 times more. ;
In 60 minutes, an adult blinks 300 times more than a 12-year-old. An adult blinks approximately 900 times in an hour, compared to 600 times for a 12-year-old. Therefore, the difference is 300 blinks.
;
Soal ini berkaitan dengan debit aliran pada pipa melingkar yang mengalir secara penuh dan menggunakan data: • Diameter pipa (D) = 2 m • Kemiringan dasar saluran (S) = 0,0061 • Jenis aliran = diasumsikan aliran penuh pada pipa tertutup • Kita gunakan Rumus Manning untuk menghitung debit (Q)⸻ Rumus Manning:Q = \frac{1}{n} \cdot A \cdot R^{2/3} \cdot S^{1/2}Keterangan: • Q = debit aliran (m³/s) • n = koefisien kekasaran Manning (asumsikan n = 0,013 untuk pipa beton) • A = luas penampang aliran (m²) • R = jari-jari hidrolis = A/P • S = kemiringan saluran⸻✅ Langkah Perhitungan: 1. Luas penampang (A) pipa lingkaran penuh:A = \frac{\pi D^2}{4} = \frac{3{,}14 \times 2^2}{4} = \frac{3{,}14 \times 4}{4} = 3{,}14 \text{ m²} 2. Keliling basah (P):P = \pi D = 3{,}14 \times 2 = 6{,}28 \text{ m} 3. Jari-jari hidrolis (R):R = \frac{A}{P} = \frac{3{,}14}{6{,}28} = 0{,}5 \text{ m} 4. Hitung debit (Q):Q = \frac{1}{0{,}013} \times 3{,}14 \times (0{,}5)^{2/3} \times (0{,}0061)^{1/2} • (0{,}5)^{2/3} \approx 0{,}63 • (0{,}0061)^{1/2} \approx 0{,}078Maka:Q \approx 76{,}92 \times 3{,}14 \times 0{,}63 \times 0{,}078 \approx 11{,}9 \text{ m³/s}⸻ Jawaban akhir:Debit aliran (Q) ≈ 11,9 m³/detik