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3 years ago

HELP!! What propeller design gives off the most air??

1 answer:

6 0

In aeronautics, a propeller, also called an airscrew, converts rotary motion from an engine or other power source into a swirling slipstream which pushes the propeller forwards or backwards. It comprises a rotating power-driven hub, to which are attached several radial airfoil-section blades such that the whole assembly rotates about a longitudinal axis. The blade pitch may be fixed, manually variable to a few set positions, or of the automatically variable "constant-speed" type.

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A graph shows how the temperature of a substance changes as energy is added steadily over time.

OlgaM077 [116]

Answer:

A flat, horizontal line

Explanation:

A flat, horizontal line indicates a phase change.

The temperature does not increase because the added heat goes into converting one phase into another.

A is wrong. A downward-sloping line indicates that the temperature is decreasing with time.

C is wrong. An upward-sloping line indicates that the temperature is increasing with time.

8 0

3 years ago

Read 2 more answers

A(n) ____ is a collection of 105 to 106 stars in a region 10 to 30 pc in diameter. The stars in the collection tend to be more t

prisoha [69]

Answer:

Open cluster

Explanation:

<u>Open cluster is the group of stars of number up to few thousand which were formed from same cloud and had approximately same age. They are mostly red and yellow stars and these stars are bound loosely by the mutual gravitational attraction</u> and the stars become disrupted by the close encounters with other clouds of gas and clusters ss these stars orbit galactic center.

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3 years ago

Que es la accion y reaccion

alina1380 [7]

Answer:

what is the action and reaction ?

Explanation:

4 0

3 years ago

What must an object have in order to exert a gravitational field?

AnnZ [28]

Answer:

power

Explanation:

6 0

4 years ago

Oxygen and hydrogen are kept under the same temperature and pressure. Oxygen molecule is 16 times more massive than hydrogen one

olya-2409 [2.1K]

Answer:

The average speed of molecule of oxygen is one-fourth of the speed of the hydrogen molecule.

Explanation:

The kinetic energy of gas molecule is given by following equation:

$K.E = \frac{3}{2} KT$

Since the temperature (T) is constant for both molecules. Therefore, there kinetic energies will also be the same. Therefore,

$K.E_{O_2} = K.E_{H_2}\\\frac{1}{2}m_{O_2}v_{O_2}^2 = \frac{1}{2}m_{H_2}v_{H_2}^2 \\\\but,\\\\m_{O_2} = 16m_{H_2}\\\\therefore,\\16 m_{H_2}v_{O_2}^2 = m_{H_2}v_{H_2}^2\\\\\\taking square root on both sides, we get:\\4v_{O_2} = v_{H_2}\\\\v_{O_2} = \frac{v_{H_2}}{4}$

<u>The average speed of molecule of oxygen is one-fourth of the speed of the hydrogen molecule.</u>

7 0

3 years ago