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2 years ago

ANWER 3 QUESTIONS WITH THE CORRECT ANSWER 24 POINTS

Physics

2 answers:

steposvetlana [31]2 years ago

4 0

15/ a
16/ b
17/ a

Hope this helps

Xelga [282]2 years ago

3 0

C
A
B
I'm not sure about number 15.

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A thin coil has 17 rectangular turns of wire. When a current of 4 A runs through the coil, there is a total flux of 5 ✕ 10−3 T ·

Alex73 [517]

Answer:

Inductance, L = 0.0212 Henries

Explanation:

It is given that,

Number of turns, N = 17

Current through the coil, I = 4 A

The total flux enclosed by the one turn of the coil, $\phi=5\times 10^{-3}\ Tm^2$

The relation between the self inductance and the magnetic flux is given by :

$L=\dfrac{N\phi}{I}$

$L=\dfrac{17\times 5\times 10^{-3}}{4}$

L = 0.0212 Henries

So, the inductance of the coil is 0.0212 Henries. Hence, this is the required solution.

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3 years ago

Waldo gets stopped by the police, and the police officer tells Waldo that she caught him on radar doing 50 miles per hour in a 4

sergij07 [2.7K]

Answer:

He calculated his average speed.

Explanation:

Waldo calculated an average of his speed in 2 hours rather than his speed whilst driving which means instead of doing 50/1 hour = 50 mph, he did 50/2hours which is how he got 25 mph. Hope this helps!

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2 years ago

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Suppose that the ultrasound source placed on the mother's abdomen produces sound at a frequency 2 MHz (a megahertz is 10^610 6

ella [17]

Answer:

the maximum frequency observed is 2.0044 10⁶ Hz

Explanation:

This is a Doppler effect exercise. Where the emitter is still and the receiver is mobile, therefore the expression that describes the process is

f ’= $f_o \ ( \frac{v \pm v_o}{v} )$

the + sign is used when the observer approaches the source

typical speeds of a baby's heart stop are around 200 m / min

let's reduce to SI units

v₀ = 200 m / min (1 min / 60 s) = 3.33 m / s

let's calculate

f ’= 2 10⁶ ( $\frac{1500 \ \pm 3.33}{1500}$ )

f ’= 2.0044 10⁶ Hz

f ’= 1,9956 10⁶ Hz

therefore the maximum frequency observed is 2.0044 10⁶ Hz

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2 years ago

Which of these would NOT produce visible light? A) flint B) lightning C) microwave D) sun

ioda

Answer:

A microwave

Explanation

The human retina can only detect incident light that falls in waves 400 to 720 nanometers long, so we can't see microwave or ultraviolet wavelengths. This also applies to infrared lights which has wavelengths longer than visible and shorter than microwaves, thus being invisible to the human eye.

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What is a function of the pineal gland in the endocrine system

Strike441 [17]

Produces melatonin <span>which helps maintain circadian rhythm and regulate reproductive hormones.</span>

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3 years ago

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