| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.32 |
| Score | 0% | 66% |
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
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work |
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kinetic energy |
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power |
Force is applied to change an object's speed or direction of motion.
Which of the following is the formula for work?
\(W = {{F}\over{d}}\) |
|
\(W = \vec{F}\vec{d}\) |
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\(W = {\vec{F} \over \vec{d} }\) |
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\(W = {F}{d}\) |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meter (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)
Which of these is not a component of blood?
white blood cells |
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plasma |
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red blood cells |
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marrow |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
An element in the physical state of __________ maintains a constant volume but their shape depends upon the shape of their container.
plasma |
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liquid |
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gas |
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solid |
In the liquid state, molecules flow freely around each other and exist at a higher temperature range than the same substance in a solid state. Liquids maintain a constant volume but their shape depends upon the shape of their container.
The __________ nervous system controls voluntary actions.
somatic |
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autonomic |
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central |
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peripheral |
Part of the peripheral nervous system, the somatic nervous system is made up of nerve fibers that send sensory information to the central nervous system and control voluntary actions.