| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
In the food chain, omnivores may be which of the following?
secondary or tertiary consumers |
|
primary or tertiary consumers |
|
primary or secondary consumers |
|
secondary consumers or scavengers |
Secondary or tertiary consumers may be omnivores.
Changes to an object's speed or direction of motion are caused by which of the following?
work |
|
a force |
|
kinetic energy |
|
power |
Force is applied to change an object's speed or direction of motion.
Which of the following represents the largest value?
1 ML |
|
1 cL |
|
1 mL |
|
1 kL |
Mega (M) is 106, kilo (k) is 103, centi (c) is 10-2, milli (m) is 10-3 so 1 ML represents the largest value.
The formula \(\vec{F_{g}} = { Gm_{1}m_{2} \over r^2}\) applies to which of Newton's laws?
second law of motion |
|
first law of motion |
|
third law of motion |
|
universal gravitation |
Newton's law of universal gravitation defines gravity: All objects in the universe attract each other with an equal force that varies directly as a product of their masses, and inversely as a square of their distance from each other. Expressed as a formula: \(\vec{F_{g}} = { Gm_{1}m_{2} \over r^2}\) where r is the distance between the two objects and G is the gravitational constant with a value of 6.67 x 10-11.
A human heart consists of how many chambers?
8 |
|
4 |
|
2 |
|
1 |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.