| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.81 |
| Score | 0% | 56% |
Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of:
1 m/s2 to a mass of 1 kg/s2 |
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1 m/s2 to a mass of 1 kg |
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1 m/s to a mass of 1 kg |
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1 mph to a mass of 1 kg |
Weight is a force that describes the attraction of gravity on an object. Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of 1 m/s2 to a mass of 1 kg.
What part of the nervous system controls simple reflexes?
medulla |
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cerebrum |
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autonomic |
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spinal cord |
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.
Which of the following is the formula for work?
\(W = {{F}\over{d}}\) |
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\(W = \vec{F}\vec{d}\) |
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\(W = {F}{d}\) |
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\(W = {\vec{F} \over \vec{d} }\) |
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: \(W = \vec{F}\vec{d}\)
A __________ is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound.
isotope |
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ion |
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molecule |
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neutron |
A molecule is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound. The molecules of elements consist of two or more similar atoms, the molecules of compounds consist of two or more different atoms.
Examples of secondary consumers include:
grasshoppers |
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wolves |
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chickens |
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plankton |
Secondary consumers (carnivores) subsist mainly on primary consumers. Omnivores are secondary consumers that also eat producers. Examples are rats, fish, and chickens.