Vole Position

Vole Position#

The position of a vole as it runs toward a garden is given by the expression $x (t) = t^{3} - t + 10$ , where $x (t)$ is position expressed as a function of time $t$ . The units of $x (t)$ are $c m$ and the units of $t$ are $s$ .

Part 1#

Determine $x (t)$ when $t = - 2 s$ .

Answer Section#

Please enter in a numeric value in $c m$ .

Part 2#

Determine $x (t)$ when $t = - 1 s$ .

Answer Section#

Please enter in a numeric value in $c m$ .

Part 3#

Determine $x (t)$ when $t = 0 s$ .

Answer Section#

Please enter in a numeric value in $c m$ .

Part 4#

Determine $x (t)$ when $t = 1 s$ .

Answer Section#

Please enter in a numeric value in $c m$ .

Part 5#

Determine $x (t)$ when $t = 2 s$ .

Answer Section#

Please enter in a numeric value in $c m$ .

Part 6#

On the coordinate system below, plot each of the points from parts 1-5 and connect them with a smooth line.

Do this by downloading the image (right-click $\to$ save image as) and drawing on it. Upload your graph as a pdf titled “part6.pdf”.

Axes for a position versus time graph. The vertical axis is labelled position in centimetres, with 0 centimetres at the origin and each tick mark denoting a 2 centimetre interval. The horizontal axis is labelled time in seconds, with 0 seconds at the origin and each tick mark denoting a 1 second interval.

Answer Section#

File upload box will be shown here.

Part 7#

Find an expression for the velocity of the vole as a function of time.

Note that it may not be necessary to use every variable. Use the following table as a reference for each variable:

For	Use
$t$	t

Answer Section#

Part 8#

What is the first time that the vole is at rest? (Enter the lowest value of $t$ even if it is less than $0$ )

Answer Section#

Please enter in a numeric value in $s$ .

Part 9#

What time is the next time that the vole is at rest? (Enter the other value of $t$ )

Answer Section#

Please enter in a numeric value in $s$ .

Part 10#

What does it mean for $t$ to be less than $0$ ?

Answer Section#

Answer in 1-2 sentences and try to use full sentences.

Part 11#

Select the interval(s) over which the velocity of the vole is positive.

Note: You will be awarded full marks only if you select all the correct choices, and none of the incorrect choices. Choosing incorrect choices as well as not choosing correct choices will result in deductions.

Answer Section#

$t = - 2 s$ to $t = t_{8}$
$t = t_{8}$ to $t = t_{9}$
$t = t_{9}$ to $t = 2 s$

Part 12#

Select the interval(s) over which the velocity of the vole is negative.

Note: You will be awarded full marks only if you select all the correct choices, and none of the incorrect choices. Choosing incorrect choices as well as not choosing correct choices will result in deductions.

Answer Section#

$t = - 2 s$ to $t = t_{8}$
$t = t_{8}$ to $t = t_{9}$
$t = t_{9}$ to $t = 2 s$

Part 13#

Find an expression for the acceleration of the vole as a function of time.

Note that it may not be necessary to use every variable. Use the following table as a reference for each variable:

For	Use
$t$	t

Answer Section#

Part 14#

At what time is the acceleration of the vole zero?

Answer Section#

Please enter in a numeric value in $s$ .

Part 15#

Select the intervals over which the speed of the vole is increasing.

Note: You will be awarded full marks only if you select all the correct choices, and none of the incorrect choices. Choosing incorrect choices as well as not choosing correct choices will result in deductions.

Answer Section#

$t = - 2 s$ to $t = t_{8}$
$t = t_{8}$ to $t = t_{14}$
$t = t_{14}$ to $t = t_{9}$
$t = t_{9}$ to $t = 2 s$

Part 16#

Select the intervals over which the speed of the vole is decreasing.

Note: You will be awarded full marks only if you select all the correct choices, and none of the incorrect choices. Choosing incorrect choices as well as not choosing correct choices will result in deductions.

Answer Section#

$t = - 2 s$ to $t = t_{8}$
$t = t_{8}$ to $t = t_{14}$
$t = t_{14}$ to $t = t_{9}$
$t = t_{9}$ to $t = 2 s$

Attribution#

Problem is licensed under the CC-BY-NC-SA 4.0 license.
The Creative Commons 4.0 license requiring attribution-BY, non-commercial-NC, and share-alike-SA license.