What are the answers to the last 3 problems

Dafna11 [192]

I believe you are correct, it is B: Diagnostic Services.

Diagnostic services are services like the staff at hospitals and the people who run machines that are related to medical needs.

<em>If this is incorrect, please, don't refrain to tell me.</em>

6 0

3 years ago

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What is the height of a building (in meters) if it takes a rock 8.2 seconds to drop from it's roof?

stellarik [79]

Answer:

d = 329.81m

Explanation:

V_f = V_0+a*t

V_f = Velocity final

V_0 = Velocity initial

a = acceleration

t = time

V_f = (0m/s)+(9.81m/s²)*(8.2s)

V_f = 80.442m/s

d = ((V_f-V_0)/2)*t

d = distance

d = ((80.442m/s-0m/s)/2)*(8.2s)

d = 329.81m

6 0

3 years ago

What is the scientific definition of Horizontal component and vertical component.

Talja [164]

I think it’s true but I’m not sure

3 0

4 years ago

Soapy water between surfaces

Inessa [10]

Answer:

<em>A</em><em>.</em><em>increases</em><em> </em><em>friction</em>

Explanation:

6 0

2 years ago

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An alternator consists of a coil of area A with N turns that rotates in a uniform field B around a diameter perpendicular to the

matrenka [14]

Answer:

(a): $\rm 2\pi f\ NBA\ \sin(2\pi ft).$ .

(b): 20.94 Volts.

Explanation:

<u>Given:</u>

Area of the coil = A.
Number of turns of the coil = N.
Magnetic field in which the coil is placed = B.
The frequency with which the coil is rotating = f.

The magnetic flux linked with a coil is defined as

$\phi = N\vec B \cdot \vec A=\rm NBA\cos\theta$

where,

$\vec A$ is the area vector of the coil, directed along the normal to the plane of the coil.

$\theta$ = angle between the magnetic field and the area vector of the coil.

Assuming that the magnetic field is along the normal to the plane of the coil, initially.

Therefore, at any later time t, the angle which the magnetic field makes with the normal to the plane of the coil is is given by

$\rm \theta = 2\pi ft.$

Therefore, the magnetic flux linked with the coil at any time t is given by

$\rm \phi = NBA\cos(2\pi ft).$

According to the Faraday's law of electromagnetic induction, the emf induced in the coil is given by

$\rm e=-\dfrac{d\phi}{dt}\\=-\dfrac{d(NBA\cos(2\pi ft))}{dt}\\=-NBA\dfrac{d(\cos(2\pi ft))}{dt}\\=-NBA(-2\pi f\sin(2\pi ft))\\=2\pi f\ NBA\ \sin(2\pi ft).$

The amplitude of the alternating voltage is the maximum value of the induced emf in the coil, the induced emf in the coil is maximum when $\rm \sin(2\pi ft)=1$ .

Therefore, the amplitude of the alternating voltage is given by

$\rm e_o=(2\pi f)NBA\ 1\\=2\pi ft \ NBA.$

Given values are:

N = 100 turns.
A = $\rm 10^{-2}\ m^2$ .
B = 0.1 T.
f = 2000 rev/min = $\rm 2000\times \dfrac1{60}\ rev/s = 33.33\ rev/s.$

Putting all these values,

$\rm e_o=2\pi \times 33.33\times (100)\times (0.1)\times (10^{-2})=20.94\ Volts.$

7 0

3 years ago