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Mechanical Comprehension

What is the power output of a 9 hp engine that's 85% efficient?

4207.5 \( \frac{ft⋅lb}{s} \)

\( Efficiency = \frac{Power_{out}}{Power_{in}} \times 100 \)
Solving for power out: \( P_{o} = \frac{E \times P_{i}}{100} \)
Knowing that 1 hp = 550 \( \frac{ft⋅lb}{s} \), P_i becomes 9 hp x 550 \( \frac{ft⋅lb}{s} \) = 4950 \( \frac{ft⋅lb}{s} \)
\( P_{o} = \frac{E \times P_{i}}{100} = \frac{85 \times 4950 \frac{ft⋅lb}{s}}{100} \) \( = \frac{420750 \frac{ft⋅lb}{s}}{100} \) = 4207.5 \( \frac{ft⋅lb}{s} \)

Electronics Information

All electricity is the movement of which subatomic particles?

electrons

All electricity is the movement of electrons which are subatomic particles that orbit the nucleus of an atom. Electrons occupy various energy levels called shells and how well an element enables the flow of electrons depends on how many electrons occupy its outer (valence) electron shell.

General Science

In the Periodic Table of the Elements, atomic number is equal to which of the following?

number of protons in the nucleus

The Periodic Table of the Elements categorizes elements primarily by the number of protons in their nucleus (atomic number) and secondarily by the characteristics they exhibit.

General Science

Which of the following is not true of light waves?

are mechanical waves

Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.

Word Knowledge

Induce most nearly means:

incite

To influence or cause.

General Science

In which type of compound does one atom borrow an electron from another atom?

ionic

A compound is a substance containing two or more different chemical elements bound together by a chemical bond. In covalent compounds, electrons are shared between atoms. In ionic compounds, one atom borrows an electron from another atom resulting in two ions (electrically charged atoms) of opposite polarities that then become bonded electrostatically.

Word Knowledge

Love–struck Charlie was oblivious to everyone but the object of his affection.

careless

Lacking awareness.

General Science

Secondary consumers that also eat producers are known as:

omnivores

Secondary consumers (carnivores) subsist mainly on primary consumers. Omnivores are secondary consumers that also eat producers. Examples are rats, fish, and chickens.

Word Knowledge

The best–selling writer was disappointed; his new novel was only a moderate success.

medium

Tending toward the average.

Automotive Information

Which of the following enables heat transfer from the cylinder heads to the coolant?

water jacket

A water jacket is a coolant-filled casing that allows heat transfer from the engine block and cylinder heads to the liquid coolant.