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Elenna [48]
3 years ago
6

Electromagnets can be used to lock doors. How could an engineer increase the strength of an electromagnetic lock? Check all that

apply
A. by increasing the current through the wire

B. by reversing the current through the electromagnet

C. by adding more coils to the electromagnet

D. by increasing the space between the coils in the electromagnet
Physics
1 answer:
ddd [48]3 years ago
3 0

The answer should be A

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HELP ;
mestny [16]

Answer:

The frequency would double.

Explanation:

Given:

Speed of wave (v) = constant.

Frequency of wave initially (f₁) = 2 Hz

Initial wavelength of the wave (λ₁) = 1 m

Final wavelength of the wave (λ₂) = 0.5 m

Final frequency of the wave (f₂) = ?

We know that the product of wavelength and frequency of the wave is equal to the speed of the wave.

Therefore, framing in equation form, we have:

Wavelength × Frequency = Speed

\lambda\times f=v

It is given that speed of the wave remains the same. So, the product must always be a constant.

Therefore,

\lambda\times f=constant\ or\ \\\lambda_1\times f_1=\lambda_2\times f_2

Now, plug in the given values and solve for 'f₂'. This gives,

1\times 2=0.5\times f_2\\\\f_2=\frac{2}{0.5}=4\ Hz

Therefore, the final frequency is 4 Hz which is double of the initial frequency.

f₂ = 2f₁ = 2 × 2 = 4 Hz

So, the second option is correct.

7 0
4 years ago
Read 2 more answers
Which actions are examples of conserving resources? Check all that apply.
uysha [10]

Answer:

1st, 2nd, and 4th

Explanation:

1st conserves gasoline/petroleum

2nd conserves electricity

4th conserves paper

6 0
3 years ago
Read 2 more answers
When a potential difference of 13 V is placed across a resistor, the current in the resistor is 1.4
vitfil [10]
Just divide the two numbers with each other.
I mean 13/1.4=9.2857...
8 0
3 years ago
Can work done=mass*acceleration*displacement(work=m*a*s)
Airida [17]

no, work is = force * distance or displacement


5 0
4 years ago
Stars within the halo move in random orbits that extend above and below the disk of the galaxy, while stars in the disk move in
Blizzard [7]
<span>Answer: Spherical Distribution Feedback: Correct The stars in the halo component have highly-inclined random orbits that orbit the center of our Galaxy. The stars within the halo would therefore make up a spherical distribution of stars surrounding the center of the Galaxy. In comparison, the disk stars move in elliptical orbits, which are nearly circular and are confined to the disk of the Galaxy. Disk stars therefore have very small inclinations and do not move above or below the plane of the Galactic disk.</span>
4 0
3 years ago
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