| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Poor balance could indicate an issue with which part of the nervous system?
cerebrum |
|
spinal cord |
|
medulla |
|
cerebellum |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
Saturated fats can __________ LDL ("bad") cholesterol while unsaturated fats can __________ it.
raise, decrease |
|
decrease, raise |
|
decrease, stabilize |
|
stabilize, raise |
Saturated fats can raise LDL ("bad") cholesterol while unsaturated fats can decrease it.
Which of the following is not a vector quantity?
momentum |
|
velocity |
|
acceleration |
|
mass |
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: \(\vec{v}\)
Vector quantities are fully described by which of the following?
a magnitude only |
|
a direction and a polarity |
|
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: \(\vec{v}\)
Momentum is a measure of how difficult it is for a moving object to stop. Which of the following is the formula for momentum?
none of these |
|
\(\vec{p} = {m \over \vec{v}}\) |
|
\(\vec{p} = { \vec{v} \over m}\) |
|
\(\vec{p} = m\vec{v}\) |
Momentum is a measure of how difficult it is for a moving object to stop and is calculated by multiplying the object's mass by its velocity: \(\vec{p} = m\vec{v}\). Like velocity, momentum is a vector quantity as it expresses force applied in a specific direction.