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3 years ago

13

Add vectors 7.5 m/s and the vector -2.9 m/s

1 answer:

densk [106]3 years ago

5 0

How To:

How do you add two vectors?

To add or subtract two vectors, add or subtract the corresponding components. Let →u=⟨u1,u2⟩ and →v=⟨v1,v2⟩ be two vectors. The sum of two or more vectors is called the resultant. The resultant of two vectors can be found using either the parallelogram method or the triangle method .

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The wavelength of a wave on a string is 1.2 meters. If the speed of the wave is 60 meters/second, what is its frequency? A. 0.20

anastassius [24]

Answer:

50 Hz

Explanation:

The frequency of a wave is given by

$f=\frac{v}{\lambda}$

where

v is the speed of the wave

$\lambda$ is the wavelength

In this problem,

v = 60 m/s

$\lambda=1.2 m$

So the frequency is

$f=\frac{60 m/s}{1.2 m}=50 Hz$

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3 years ago

When a 100-N force acts horizontally on an 8.0-kg chair, the chair moves at a constant speed across the level floor. Which state

TiliK225 [7]

Answer:

The applied force is greater than the frictional force.

Explanation:

the chair moves at <u>a constant speed</u><u> </u><u>therefore</u><u>,</u><u> </u><u>the</u><u> </u><u>answer</u><u> </u><u>is</u><u> </u><u>not</u><u> </u><u>A</u><u> </u><u>or</u><u> </u><u>C</u><u>.</u>

if there is no friction then the chair <u>would accelerate and it would not be at a constant speed</u><u>.</u>

hence, the only possible answer is B.

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2 years ago

Match each example with the appropriate stage of technological design. drag each arrow to its correct match.

Akimi4 [234]

Answer:

Review each answer in the explanation part

Explanation:

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Note: Identify a problem is related always with a need.

After identify the problem the next stage is the design

Design a solution = Engineers determine what features the material must have.

Note: The design process implies the choice of the materials and the proper numeric calculations.

Implement the solution = Engineers test a carbon - plastic compound in a wind tunnel.

Note: after the design, the following process is the built of the equipment and the different tests.

Evaluate the solution = The carbon-plastic compound is redesigned to save maximun energy.

Note: After testing, you enter a part of re-design that means making improvements to the already constructed.

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3 years ago

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MAXImum [283]

Answer:

A. pulls back on the Earth, which is the main cause of the rise and fall of the ocean tides on Earth.

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ch4aika [34]

Hot air rises ya fool ya fool

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3 years ago

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