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4 years ago

1. what planet/star is the center of the solar system

Physics

1 answer:

puteri [66]4 years ago

8 0

I need more details like r u reading from something

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Tonks changes her hair color for a party with a red color rinse. The next day, she washes the color out of her hair and it retur

Sergeu [11.5K]

Answer: No , a chemical change has not occured as it was easily reversed.

Explanation:

Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances. It can only be reversed with the help of a chemical reaction.

Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.It can be easily reversed.

As the hair colour was washed out and returned to its original brown colour, it was a physical change.

5 0

3 years ago

Two wires, both with current out of the page, are next to one another. The wire on the left has a current of 1 A and the wire on

Soloha48 [4]

Answer:

C. The left wire attracts the right wire and exerts as much force as the right wire does.

Explanation:

To know what is the answer you first take into account the magnetic field generated by each current, for a distance of d:

$B_1=\frac{\mu_oI_1}{2\pi d}=\frac{\mu_o}{2\pi d}(1A)\\\\B_2=\frac{\mu_oI_2}{2\pi d}=\frac{\mu_o}{2\pi d}(2A)=2B_1\\\\$

Next, you use the formula for the magnetic force produced by the wires:

$\vec{F_B}=I\vec{L}\ X \vec{B}$

if the direction of the L vector is in +k direction, the first wire produced a magnetic field with direction +y, that is, +j and the second wire produced magnetic field with direction -y, that is, -j (this because the direction of the magnetic field is obtained by suing the right hand rule). Hence, the direction of the magnetic force on each wire, produced by the other one is:

$\vec{F_{B1}}=I_1L\hat{k}\ X\ B_2(-\hat{j})=I_1LB_2\hat{i}=(2A^2)\frac{L\mu_o}{2\pi d}\hat{i}\\\\\vec{F_{B2}}=I_2L\hat{k}\ X\ B_2(\hat{j})=I_2LB_1\hat{i}=-(2A^2)\frac{L\mu_o}{2\pi d}\hat{i}$

Hence, due to this result you have that:

C. The left wire attracts the right wire and exerts as much force as the right wire does.

6 0

4 years ago

How can a small human retina detect objects larger than itself?

muminat

The correct answer would be A) the lenses of the eye change the size of images

5 0

3 years ago

1.When molecules change state of matter from a liquid to a solid, then _______________.

Jet001 [13]

The answwr would be d and c becasuase it just would

4 0

3 years ago

Read 2 more answers

You push a desk with 230 N, but the desk doesn't move due to its friction with the ground. What is the magnitude of the friction

ASHA 777 [7]

Answer:

$force \: = friction \: based \: on \: newtons \: third \: law \\ \: f = |230| = 230 \: newton \\ this \: is \: why \: the \: desk \: \\ doesnt \: move...$

3 0

3 years ago