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3 years ago

14

What is the value of work done on an object when a 70–newton force moves it 9.0 meters in the same direction as the force?

1 answer:

slava [35]3 years ago

5 0

Answer:

630 J

Explanation:

W = Fdcosθ

W = 70(9)cos0

W = 630 J

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A 0.45 m radius, 500 turn coil is rotated one-fourth of a revolution in 4.01 ms, originally having its plane perpendicular to a

AysviL [449]

Answer:

B = 0.126 T

Explanation:

As per Faraday's law we know that rate of change in magnetic flux will induce EMF in the coil

So here we can say that EMF induced in the coil is given as

$EMF = \frac{\phi_2 - \phi_1}{\Delta t}$

initially the coil area is perpendicular to the magnetic field

and after one fourth rotation of coil the area vector of coil will be turned by 90 degree

so we can say

$\phi_1 = NBAcos 0 = BA$

$\phi_2 = NBAcos 90 = 0$

now we will have

$EMF = \frac{NBA}{t}$

$10,000 V = \frac{(500)(B)(\pi \times 0.45^2)}{4.01\times 10^{-3}}$

$B = 0.126 T$

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3 years ago

Match the object to the type of motion it's displaying. which letter goes with which number?

makkiz [27]

<em>Hello There!!</em>

<em>I think the best answer choice is:</em>

<em>A. </em> $Linear$ $motion$

<em>B. </em> $Rotational$ $motion$

<em>D. </em> $Vibrational$ $motion$

<em>4. </em> $Runners$ $sprinting$ $across$ $a$ $straight$ $track$

<em>C. </em> $Curvilinear$ $motion$

<em>3. </em> $Music$ $being\\\\\\$ $played$ $on$ $a$ $stringed$ $instrument,$ $such$ $as$ $a$ $guitar$

<em>2. </em> $A$ $car$ $driving$ $up$ $a$ $winding$ $mountain$ $road$

<em>1. </em> $The$ $propeller$ $of$ $an$ $aircraft$ $in$ $midair$

<em>I'm not sure this is 100% right....</em>

<em>P.S </em><em>Tell me if this is wrong....</em>

<em /> $Hope This Helps$ <em> </em> $Sangwoo!!$ <em />

<em>#</em> $Be$ <em> </em> $Bold$ <em />

<em># </em> $Always$ <em> </em> $Brainly$ <em />

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3 years ago

What wave property is shown

pantera1 [17]

Answer:

The answer is Refraction

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3 years ago

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Through which medium is it impossible to transmit sound waves?.

dusya [7]

Answer: vacuum

Explanation: The vacuum is the medium from where the sound wave cannot pass. A vacuum is basically an area without any air. Since the sound wave is a mechanical wave that's why it cannot travel through a medium where there is no matter of vibrations to works in, i.e, it can't travel through a vacuum.

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3 years ago

A person drives a car around a circular road with a constant speed of 20 m/s. The

ale4655 [162]

Answer:

16 m/s^2

Explanation:

acceleration tangential = (v^2)/r

a=400/25

a=16 m/s^2

Side note: next time, be more specific when asking about acceleration in circular motion. There's more than one type! Example:

angular acceleration=acceleration tangential/r

angular acc.=16/25

angular acc.=0.64 rad/s^2

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3 years ago

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