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2 years ago

13

The magnetic lines of force always travel from north to south true or false

1 answer:

kumpel [21]2 years ago

7 0

Answer:

True

Explanation:

Magnetic field lines outside of a permanent magnet always run from the north magnetic pole to the south magnetic pole. Therefore, the magnetic field lines of the earth run from the southern geographic hemisphere towards the northern geographic hemisphere.

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Q3. A bridge is built without expansion gaps.

snow_tiger [21]

The answer is A ) much hotter

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3 years ago

1. (1 pt) Which of these is a physical property of wood? A. Wood can burn. B. Wood can rot. C. Wood does not rust. D. Wood is so

anygoal [31]

A physical property can be seen or a change in color.
The answer is B because you can see when wood is rotting.

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4 years ago

The balloon's behavior results from a change at the electron level. What do you think might have happened while rubbing the ball

Mariulka [41]

Answer:

Explanation:

opposite charges attract each other, while rubbing the objects together they developed opposite charges which caused them to drift together

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4 years ago

1.The<br> across each resistor is<br> the same in a series circuit.<br> ) voltage<br> current

Ber [7]

Answer:

The answer is Current.

Explanation:

In a series circuit, every component will have the same <u>current</u>.

In parallel circuit, all <u>voltage</u> of component remains the same.

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3 years ago

Read 2 more answers

A force in the +x-direction with magnitude F(x)=18.0N−(0.530N/m)x is applied to a 8.90 kg box that is sitting on the horizontal,

Lady_Fox [76]

Answer:

6.875 m/s

Explanation:

The force is variable which is given by

F(x) = 18 - 0.53 x

mass of the box, m = 8.9 kg

initially it is at rest at x = 0

Let the velocity is v after travelling a distance of 15 m.

According to the work energy theorem, the work done by all the forces is equal to the change in kinetic energy of the body.

Work done = change in kinetic energy

$\int \overrightarrow{F}.d\overrightarrow{x}=\Delta K.E$

$\int_{0}^{15} \left ( 18-0.53 x \right )dx=\frac{1}{2}\times m \left ( v^{2}-u^{2} \right )$

$\left ( 18x-0.265x^{2} \right )_{0}^{15}=\frac{1}{2}\times 8.9\times \left ( v^{2}-0^{2} \right )$

18 x 15 - 0.265 x 15 x 15 = 4.45 x v²

270 - 59.625 = 4.45 v²

v² = 47.275

v = 6.875 m/s

Thus, the final velocity of the box is 6.875 m/s.

4 0

3 years ago