| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.91 |
| Score | 0% | 58% |
50°F is how many °C?
10 |
|
58 |
|
-10 |
|
122 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (50 - 32)\)
\(C° = {5 \over 9} (18)\)
\(C° = {90 \over 9}\)
\(C° = 10\)
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
blood cells |
|
bronchioles |
|
diaphragms |
|
capillaries |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
Sound travels fastest through which of the following media?
air |
|
vacuum |
|
water |
|
metal |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).
Which of the following is the formula for power?
\(P = w t\) |
|
\(P = \vec{w}t\) |
|
\(P = {\vec{w} \over t}\) |
|
\(P = {w \over t}\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).
What part of the nervous system controls simple reflexes?
spinal cord |
|
medulla |
|
autonomic |
|
cerebrum |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.