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Vietnam
A water wave passes a sensor in a physics laboratory. As the wave passes, the depth of the water in metres \( (d) \) after time \( t \) seconds is modelled by the function \( d=18.3-0.47 \cos (20.9 t) \). a What are the maximum and minimum values of \( d \) ? b Find the first time after 19 seconds at which the depth is 18 m .
Physics Jan 19, 2025
Nêu định nghĩa của một số mũ âm và cho ví dụ cụ thể.
Algebra Jan 18, 2025
k) \( \frac{12}{|x-5|}=\frac{6}{7} \)
Algebra Jan 17, 2025
d) \( \frac{x-1}{x-5}=\frac{6}{7} \)
Algebra Jan 17, 2025
4 Zuzanna models the depth \( D \) metres of sea water in a harbour \( h \) hours after midnight with the function \( D=1.8 \sin (30 t)+12.3 \). a Predict the depth of water in the harbour at 5.30 am. b Predict when the depth of water in the harbour will be 10.9 m .
Pre Calculus Jan 17, 2025
Câu \( 2(2,0 \) điềm). a) Giải phương trình \( 2 x^{2}-9 x+10=0.2 ; \frac{5}{2} \) b) Cho phương trình \( x^{2}+3 x-1=0 \) có hai nghiệm phân biệt \( x_{1}, x_{2} \). Không giải phương trình, hãy tính giá trị của biểu thức \( T=\frac{3\left|x_{1}-x_{2}\right|}{x_{1}^{2} x_{2}+x_{1} x_{2}^{2}} \)
Algebra Jan 17, 2025
3 Jakub models the average monthly temperature \( T \) degrees Celsius in Warsaw with the function \( T=-11 \cos (30 t)+7.5 \) on the domain \( 0 \leq t \leq 11 \). \( t \) is time measured in months, with \( T(0) \) representing the average temperature in January. a Predict the average temperature in May. b Predict when the average temperature would be zero.
Pre Calculus Jan 17, 2025
Jakub models the average monthly temperature \( T \) degrees Celsius in Warsaw with the function \( T=-11 \cos (30 t)+7.5 \) on the domain \( 0 \leq t \leq 11 . t \) is time measured in months, with \( T(0) \) representing the average temperature in January. a Predict the average temperature in May. b Predict when the average temperature
Pre Calculus Jan 17, 2025
9. Biết \( I=\int_{0}^{1} \frac{e^{2 x-1}-e^{-3 x}+1}{e^{x}} d x \)
Calculus Jan 16, 2025
PHÀN III. Câu trắc nghiệm trả lời ngắn Câu 8: So sánh \( 5^{6 \sqrt{3}} \) và \( 5^{3 \sqrt{6}} \). Trả lời:
Pre Algebra Jan 16, 2025
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