| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
Work is measured in:
joules or newton-meters |
|
watts |
|
amps |
|
horsepower |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meters (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)
Which of the following is not a characteristic of the Sun?
formed 2.6 billion years ago |
|
is composed of hydrogen and helium |
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makes up over 99% of the mass of the solar system |
|
is a yellow dwarf star |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
In the classification of life, which of the following is not a domain?
eukaryota |
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animalia |
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archaea |
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bacteria |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
protons |
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electrons |
|
electron shells |
|
atomic mass units |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
potential |
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inherent |
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gravitational |
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kinetic |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.