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Alexandra [31]
4 years ago
9

Choose all of the statements that are true about electromagnets: 1. Electromagnets are permanent and always have a magnetic fiel

d around them. 2. electromagnets can be made stronger by adding more coils to the solenoid. 3. electromagnets can be made stronger by increasing the strength of the electrical source. 4. none of the above.
Physics
1 answer:
Nitella [24]4 years ago
7 0

Answer:

2. electromagnets can be made stronger by adding more coils to the solenoid.

3. electromagnets can be made stronger by increasing the strength of the electrical source.

Explanation:

Electromagnets are not permanent, they act as magnets when current runs through its coils. They can be stronger by increase the current that goes through the coil surrounding them,. This can be done two ways: 1) increasing the actual current intensity, or 2) increasing the number of coils that wrap around them.

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A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open to the air at the top. Fr
maw [93]

Answer:

x = 0.081 m.

Explanation:

a) To find how much does the atmospheric pressure cause the spring to compress we need to use the following equation:

F = k*x    (1)

<u>Where</u>:

F: is the force

k: is the spring constant = 3300 N/m

x: is the distance of compression =?

The force can be found as follows:

F = P*A    

<u>Where</u>:

P: is the atmospheric pressure = 101325 Pa

A: is the area of the piston = πr²

r: is the radius = 0.029 m

F = 101325 Pa*\pi*(0.029 m)^{2} = 267.7 N    

Now, from equation (1) we can find x:

x = \frac{F}{k} = \frac{267.7 N}{3300 N/m} = 0.081 m    

Therefore, the atmospheric pressure causes the spring to compress 0.081 m.      

I hope it helps you!

6 0
4 years ago
By spreading sand on oil spill road you can product vehrical from skidding
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4 0
4 years ago
You are leaving for a party at your cousin’s house in a city that is 150 km away. You will travel at an average rate of 50 km/hr
mrs_skeptik [129]

The distance you should cover is: S=150 km

Your average speed is: v=50 km/h

Therefore, to calculate the time you will take to cover this distance, we can use the basic relationship between space, distance and time, and we find:

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3 0
3 years ago
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What is the total current I flowing through a system with two resistors in parallel with resistances of 2Ω and 5Ω, and a battery
Andrej [43]

Answer:

7A

Explanation:

Current I = potential difference V ÷ Resistance R

I = V/R ........1

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Given;

V = 10V

R1 = 2 ohms

R2 = 5 ohms

Substituting the values into equation 2, to calculate the overall resistance;

1/Rt = 1/2 + 1/5

1/Rt = 7/10

Rt = 10/7 ohms

From equation 1, we can solve for the total current;

I = V/Rt = 10/(10/7)

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The total current I flowing through a system is 7A

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4 years ago
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