| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.31 |
| Score | 0% | 66% |
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
|
the northern lights |
|
day and night cycle |
|
tides |
Tides are caused by the gravitational interaction of Earth and the Moon.
Arteries carry __________ blood at __________ pressure.
oxygenated, low |
|
deoxygenated, low |
|
oxygenated, high |
|
deoxygenated, high |
Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
The universal recipient blood type can recieve any other blood type. Which blood type is the universal recipient?
O |
|
AB |
|
AB-positive |
|
O-negative |
Blood transfer is limited by the type and Rh factor of the blood. Someone who has Rh-factor negative blood cannot receive blood with a positive type but a person with Rh-factor positive type blood can receive Rh-negative blood. Type O negative blood is the universal donor because it can be given to a person with any blood type. Type AB positive is the universal recipient meaning someone with this blood type can receive any other type of blood.
212°F is how many °C?
100 |
|
-100 |
|
\(135 {5 \over 9}\) |
|
0 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (212 - 32)\)
\(C° = {5 \over 9} (180) = {{180 \times 5} \over 9}\)
\(C° = {900 \over 9}\)
\(C° = 100\)
Velocity is the rate at which an object changes position. What is the formula for velocity?
\(\vec{v} = { \vec{d} \over t } \) |
|
none of these |
|
\(\vec{v} = { t \over \vec{d} } \) |
|
\(\vec{v} = \vec{d}t \) |
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 \(\vec{v} = { \vec{d} \over t } \)