| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.07 |
| Score | 0% | 61% |
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
compound |
|
atom |
|
element |
|
molecule |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.
Which of the following is the formula for power?
\(P = \vec{w}t\) |
|
\(P = {w \over t}\) |
|
\(P = {\vec{w} \over t}\) |
|
\(P = w t\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).
An element in the physical state of __________ maintains a constant volume and shape.
solid |
|
gas |
|
gel |
|
liquid |
An element in a solid state has atoms or molecules that are constricted and do not move freely. Solids maintain a constant volume and shape and exist at a lower temperature than liquids or gases.
Velocity is the rate at which an object changes position. What is the formula for velocity?
\(\vec{v} = { \vec{d} \over t } \) |
|
\(\vec{v} = { t \over \vec{d} } \) |
|
\(\vec{v} = \vec{d}t \) |
|
none of these |
Velocity is the rate at which an object changes position. Rate is measured in time and position is measured in displacement so the formula for velocity becomes \(\vec{v} = { \vec{d} \over t } \)
Scalar quantities are fully described by which of the following?
a magnitude and a polarity |
|
a magnitude only |
|
a magnitude and a direction |
|
a direction only |
Velocity and displacement are vector quantities which means each is fully described by both a magnitude and a direction. In contrast, scalar quantities are quantities that are fully described by a magnitude only. A variable indicating a vector quantity will often be shown with an arrow symbol: \(\vec{v}\)