| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.13 |
| Score | 0% | 63% |
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
|
work |
|
kinetic energy |
|
power |
Force is applied to change an object's speed or direction of motion.
Tertiary consumers eat which of the following?
decomposers |
|
producers |
|
primary and secondary consumers |
|
all of these |
Tertiary consumers eat primary consumers and secondary consumers and are typically carnivorous predators. Tertiary consumers may also be omnivores. Examples include wolves, sharks, and human beings.
When two air masses meet and neither is displaced, what kind of front is present?
occluded |
|
warm |
|
stationary |
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cold |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
Examples of secondary consumers include:
wolves |
|
chickens |
|
grasshoppers |
|
plankton |
Secondary consumers (carnivores) subsist mainly on primary consumers. Omnivores are secondary consumers that also eat producers. Examples are rats, fish, and chickens.
Which of the following is the formula for power?
\(P = {w \over t}\) |
|
\(P = w t\) |
|
\(P = {\vec{w} \over t}\) |
|
\(P = \vec{w}t\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).