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3 years ago

5

Calculate: A model airplane has a mass of 3.2 kg. Its propeller pulls it forward with a force of 7.0 N. What is the airplane’s a

cceleration?

1 answer:

vitfil [10]3 years ago

5 0

The airplanes acceleration is 2.1875

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How did early chemists determine which substances were elements

Jlenok [28]

Chemistry deals with the study of elements-- their properties, chemical reactions and their compounds. This science includes the study of how these elements or compounds are formed. The history of chemistry is divided to 4 periods.
Black Magic, Alchemy, Traditional Chemistry and Modern Chemistry comprised these periods.
How did the early chemists determine which of the substances are elements? Long time ago, chemists knew which substances could not be broken down and that mixtures are broken down through chemical means. Through the said process, they were able to identify which are elements from the substances they have tested.

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3 years ago

The inclined plane in the figure above has two sections of equal length and different roughness. The dashed line shows where sec

saveliy_v [14]

The static friction exerted on the block by the incline is $\mu _ s _1 Mgcos \ \theta$ .

The given parameters;

<em>mass of the block, = M</em>
<em>coefficient of static friction in section 1, = </em> $\mu_s_1$ <em />
<em>angle of inclination of the plane, = θ</em>

<em />

The normal force on the block is calculated as follows;

Fₙ = Mgcosθ

The static friction exerted on the block by the incline is calculated as follows;

$F_s = \mu_s F_n\\\\F_s = \mu _s_1(Mg cos\ \theta)\\\\F_s = \mu _s_1 Mgcos\ \theta$

Thus, the static friction exerted on the block by the incline is $\mu _ s _1 Mgcos \ \theta$

Learn more here:brainly.com/question/17237604

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3 years ago

A combination of two or more simple machines is a (n)

Lilit [14]

A compound Machine is 2 machines that work together in order to make a task easier.

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3 years ago

An ambulance is rapidly approaching you at a stop light. What happens to the frequency and pitch of the sound as the ambulance d

vagabundo [1.1K]

Answer:

A )

Explanation:

This change in frequency observation occur due to doppler effect

if the wave source moves,In the time between one wave peak being emitted and the next, the source will have moved so that the shells will no longer be concentric. The wavefronts will get closer together in front of the source as it travels and will be further apart behind it. (see the graph)

when the person standing still in front of the ambulance, he will observe a <em>higher frequency </em>than before as the source travels towards them.

$f_(observed)=\frac{V_(wave)}{V_(wave)-V_(source)} *f_(original)$

The pitch we hear depends on the frequency of the sound wave.

A high frequency corresponds to a high pitch

as we hear a higher frequency , it makes the <em>pitch higher</em> too

5 0

3 years ago

Read 2 more answers

What would have the greatest gravitational pull on each other?

denpristay [2]

Answer:

Jupiter

Characteristics of a Dwarf Planet

One of Sir Isaac Newton's accomplishments established that the gravitational force between two bodies is proportional to their masses. All other things being equal, the planet with the strongest pull is the one with the largest mass, which is Jupiter.

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3 years ago