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vodka [1.7K]
3 years ago
12

An object is hanging by a string from the ceiling of an elevator. The elevator is moving upward with a constant speed. What is t

he magnitude of the tension in the string?
The magnitude of the tension in the string is equal to the magnitude of the weight of the object.
The magnitude of the tension in the string is less than the magnitude of the weight of the object.
The tension in the string cannot be determined without knowing the speed of the elevator.
The magnitude of the tension in the string is greater than the magnitude of the weight of the object.
The tension in the string is zero.
Physics
1 answer:
xeze [42]3 years ago
8 0

Answer:

The magnitude of the tension in he string is equal to the magnitude of the weight of the object.

Explanation:

According to the Newton's 1st law, An object will remain at rest or in uniform motion in a straight line unless acted upon by an unbalanced force.

In here, the elevator is moving with a constant speed. So the object must have the equal constant speed. Which means, it has a uniform motion. According to Newton's 1st law, the total unbalanced force on the object must be zero . As we know, there are only two forces are on the object and they are,

The tension in string(T)   ,   The weight of the object(W) .

                                  ∴ F    =   0

                                 T  -  W  =   0

So to balanced those forces, the magnitude of the tension in the string must be equal to the magnitude of the weight of  the object.  

       

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The forces on a current-carrying wire in a magnetic field are at their strongest when the current is at a 90-degree angle to the field. Option D is correct.

<h3>What is a magnetic field?</h3>

It is the type of field where the magnetic force is obtained. The magnetic force is obtained by the field felt around a moving electric charge.

The complete question is;

"When is the force on a current-carrying wire in a magnetic field at its strongest?

-when the current is at a 0-degree angle to the field

-when the current is at a 30-degree angle to the field

-when the current is at a 45-degree angle to the field

-when the current is at a 90-degree angle to the field"

The magnetic force is found as;

F=BILSINΘ

Where,

Magnetic Field, B

Length of the wire, L

The angle between field and current, Θ

When Θ=90°

The value of the magnetic force is;

F=BIL

When the current is flowing at a 90-degree angle to the magnetic field, the forces acting on a wire carrying a current are the strongest.

Hence, option D is correct.

To learn more about the magnetic field, refer to the link;

brainly.com/question/19542022

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4 0
1 year ago
A bug walks exactly halfway around the edge of a circular cupcake with a diameter of 5 cm what is the distance he traveled and w
adelina 88 [10]

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The 'why' appears up above, in the first 2 lines of this solution.

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Answer:

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6 0
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natka813 [3]

Answer:

Explanation:

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