Choose the One Alternative That Best Completes the Statement or Answers

question 291

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-A rocket is shot straight up in the air from the ground at a rate of 80 feet per second. The rocket is tracked by a range finder that is 431 feet from the launch pad. Let $d$ represent the distance from the rocket to the range finder and t represent the time, in seconds, since "blastoff". Express $\mathrm { d }$ as a function of $t$

• A) \(\mathrm { d } ( \mathrm { t } ) = 431 ^ { 2 } + ( 80 \mathrm { t } ) ^ { 2 }\)
• B) \(\mathrm { d } ( \mathrm { t } ) = \sqrt { 80 ^ { 2 } + ( 431 \mathrm { t } ) ^ { 2 } }\)
• C) \(\mathrm { d } ( \mathrm { t } ) = 431 + 80 \mathrm { t } ^ { 2 }\)
• D) \(d ( t ) = \sqrt { 431 ^ { 2 } + ( 80 t ) ^ { 2 } }\)

---

Definitions:

Sodium-Potassium Pump

A membrane-bound enzyme complex that exchanges sodium ions out of and potassium ions into a cell, crucial for maintaining cellular homeostasis.

Plasma Membrane

The plasma membrane is the biological membrane that separates the interior of all cells from the outside environment, controlling the passage of substances in and out of the cell.

Membrane Potential

The voltage across a cell's plasma membrane, representing a difference in electrical charge inside and outside the cell.

Afterpotential

The transient change in membrane potential that occurs following a nerve impulse, affecting neuron excitability.