Solve the Problem $176 \mathrm { ft } / \mathrm { sec }$

question 272

Multiple Choice

Solve the problem.
-A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of $176 \mathrm { ft } / \mathrm { sec }$ , and the gorge is $448 \mathrm { ft }$ deep, during what interval can the flare be seen? $\left( h = - 16 t ^ { 2 } + v _ { O } t + \right.$ $\left. \mathrm { h } _ { \mathrm { O } } \right)$

• A) \(0 < t < 4\)
• B) \(8 < t < 11\)
• C) \(4 < \mathrm { t } < 7\)
• D) \(12 < t < 15\)

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Definitions:

Propanamide

An organic compound consisting of a propyl chain attached to a nitrogen atom of an amide group.

N-Methylacetamide

An organic compound characterized by a methyl group attached to the nitrogen atom of an acetamide.

IUPAC

The International Union of Pure and Applied Chemistry, an organization that sets standards for naming chemical compounds and elements, among other activities in the chemistry field.

Hydrogen Bonded

Describes a type of chemical bond that occurs when a hydrogen atom, which is covalently bonded to a highly electronegative atom, forms an electrostatic or partial covalent bond with another electronegative atom.