Concept explainers
Returning to Exercise 24, explain why it is reasonable for the graph representing the rocket flight to be shaped as it was. How does this conform to your intuition? Would a linear equation have been an acceptable model?
24. Rocket flight. Assume that if a model rocket is fired directly upward (with a certain velocity), its distance above the ground at time t is given by the equation
a. Graph this equation.
b. Are there any values for t that it would not make sense to
use for this equation because of the physical
characteristics of a rocket?
c. Find the time at which the rocket reaches its highest point.
d. Find the time at which the rocket returns to the ground.
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Chapter 7 Solutions
Mathematics All Around-Workbook
- 7. Suppose that X is a set, that I is a nonempty set, and that for each i Є I that Yi is a set. Suppose that I is a nonempty set. Prove the following:2 (a) If Y; CX for all i EI, then Uiel Yi C X. ¹See Table 4.8.1 in zyBooks. Recall: Nie X₁ = Vi Є I (x = X₁) and x = Uier X₁ = i Є I (x Є Xi). (b) If XCY; for all i Є I, then X Ciel Yi. (c) U(x)=xnUY. iЄI ΕΙarrow_forwardFind the equation of the tangent line to the graph of the given function at the given value of x. f(x)=√√x+33; x=4arrow_forwardFind g[f(-7)]. f(x) = x² + 1; g(x)=-5x-1arrow_forward
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- Let f(x)=7x²-2x and g(x) = 5x+3. Find f[g(k)].arrow_forwardUse the method of reduction of order to find a second solution to ty"-(4t+4)+(4t+8)y = 0, t> 0 Given y₁(t) = e²t Y2(t) = Give your answer in simplest form (ie no coefficients)arrow_forward1. Suppose the domain of discourse is kinds of minerals. Let A be kinds of minerals that dissolve in acid, let S be minerals that can be scratched by an iron nail, and let C be minerals that are clear. Write expressions using set operations that represent the following sets of minerals: (a) Minerals that dissolve in acid and can be scratched by an iron nail. (b) Minerals that dissolve in acid and are not clear. (c) Minerals that are either clear or both dissolve in acid but cannot be scratched by an iron nail. (d) Minerals that are neither dissolvable in acid nor scratable by an iron nail. (e) Minerals that are either both dissolvable in acid and scratchable by an iron nail or both dissolvable in acid and not clear.arrow_forward
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