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Electronics Information

Which of the following allows current to pass easily in one direction and blocks current in the other direction?

diode

A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.

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 \( \frac{ft⋅lb}{s} \)

Word Knowledge

The singer's prominence ensured that the concert would sell out.

renown

Importance.

Word Knowledge

Discern most nearly means:

detect

To recognize as separate as distinct.

General Science

In taxonomy, domains are the broadest classification of life. How many domains are there?

The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.

Word Knowledge

Regurgitate most nearly means:

spew

To pour out or throw back.

Shop Information

When compared to drilling, boring makes __________ holes.

larger

Drilling is the process of making small holes in wood or metal while boring is the process of making larger holes.

Word Knowledge

The drab winter scene made Keisha long for the vibrant colors of spring.

dreary

Dull, monotonous.

Word Knowledge

Flaw most nearly means:

defect

An imperfection.

General Science

The small intestine utilizes enzymes produced where?

all of these are correct

The small intestine is where most digestion takes place. As food travels along the small intestine it gets broken down completely by enzymes secreted from the walls. These enzymes are produced in the small intestine as well as in the pancreas and liver. After the enzymes break down the food, the resulting substances are then absorbed into the blood via capillaries in the small intestine walls.