Chapter 2: Problem 43
A honeybee population starts with 100 bees and increases at a rate of \(\mathrm{n}^{\prime}(\mathrm{t})\) bees per week. What does \(100+\int_{0}^{15} \mathrm{n}^{\prime}(\mathrm{t}) \mathrm{dt}\) represent?
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Chapter 2: Problem 43
A honeybee population starts with 100 bees and increases at a rate of \(\mathrm{n}^{\prime}(\mathrm{t})\) bees per week. What does \(100+\int_{0}^{15} \mathrm{n}^{\prime}(\mathrm{t}) \mathrm{dt}\) represent?
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Determine the signs of the integrals without evaluating them : (a) \(\int_{-1}^{2} x^{3} d x\) (b) \(\int_{0}^{2 \pi \sin x}{x} d x\) (c) \(\int_{0}^{\pi} x \cos x d x\).
Explain why each of the following integrals is improper. (a) \(\int_{1}^{\infty} x^{4} e^{-x^{4}} d x\) (b) \(\int_{0}^{\pi / 2} \sec x d x\) (c) \(\int_{0}^{2} \frac{x}{x^{2}-5 x+6} d x\) (d) \(\int_{-\infty}^{0} \frac{1}{x^{2}+5} d x\)
Prove that (i) \(\frac{99 \pi}{400}<\int_{1}^{100} \frac{\tan ^{-1} x}{x^{2}} d x<\frac{99 \pi}{200}\) (ii) \(\frac{609(\ln 2)^{2}}{4}<\int_{2}^{5} x^{3}(\ln x)^{2} d x<\frac{609(\ln 5)^{2}}{4}\) (iii) \(\left(1-\mathrm{e}^{-1}\right) \ln 10<\int_{1}^{10} \frac{1-\mathrm{e}^{-x}}{\mathrm{x}} \mathrm{dx}<\ln 10\) (iv) \(\frac{1}{10 \sqrt{2}} \leq \int_{0}^{1} \frac{x^{9}}{\sqrt{1+x}} d x \leq \frac{1}{10}\).
If oil leaks from a tank at a rate of \(\mathrm{r}(\mathrm{t})\) litres per minute at time \(t\), what does \(\int_{0}^{120} r(t) d t\) represent?
Evaluate \(\int_{0}^{1}\left(\sqrt[3]{1-x^{7}}-\sqrt[7]{1-x^{3}}\right) d x\)
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