PHYSICS MIDDLE SCHOOL

Give two ways of reversing the direction of the forces on the coil in the electric motor?​

Answers

Answer 1
Answer:

Answer:

Interchanging the poles of the magnet

Reversing the direction of the applied current

Explanation:

  1. The working of the electric motor is associated with Fleming's left-hand rule.
  2. It states that if a current-carrying conductor is placed inside a magnetic field, it experiences a force in the direction perpendicular to the direction of the electric current and magnetic field.
  3. These three physical quantities are placed in a mutually perpendicular direction.
  4. So, in order to reverse the direction of force, you have to either change the direction of the current or magnetic field.

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Which section of the graph represents negative acceleration?

Answers

The area between the 10 and the 12.
C, because it going down, which is negative and also it change in speed

How are both the genes and the environment determine how tall a person will be?

Answers

well i'm not exactly sure, but i know that you get all of your inherited traits from your parts and you have all the the looks of your parents half and half of each of your parents.

Please! Explain a connection with a molecule and matter.

Answers

An atom is the basic unit of a chemical element while a molecule is an electrically neutral group of two or more atoms held together by chemical bonds. I guess its connected because in a molecule, its two or more atoms because of the bond.

Some constellations, such as Ursa Minor, are visible in the sky year-round; other constellations appear for only part of the year. Explain why this happens.

Answers

Answer:

As the Earth revolves about the sun, different sky is visible during time of the year. We have winter constellations and summer constellations. But some constellations appear through out the year like Ursa Minor are the ones which lie close to the poles. The Earth rotates about the axis passing through North and south pole. The axis always points towards North. Thus, the constellations near the Poles would be visible throughout the year.

Some stars follow our orbit, and some stay in the same position forever.

If the velocity of a body varied uniformly from 10 ms-1 to 25 ms-1 during a time interval of 5s what was the acceleration of the body?

Answers

Acceleration = velocity change / time
a = 25 - 10 / 5
a = 15/5
a = 3

In short, Your Answer would be 3 m/s2

Hope this helps!
Acceleration of the body = .

Hope this cleared your doubt. Have a great day/night ahead!

Question 2How do an ionic bond and a covalent bond differ?


A. An ionic bond is an attraction between oppositely charged ions. A covalent bond is a sharing of electrons between atoms.


B. A covalent bond is an attraction between oppositely charged ions. An ionic bond is a sharing of electrons between atoms.


C. There is no difference. Both an ionic bond and a covalent bond share electrons.


D. There is no difference. Both an ionic bond and a covalent bond are attractions between oppositely charged ions.


Question 3

What is a bond between a positive and a negative ion called?


A. covalent bond


B. ionic bond


C. metallic bond


D. polar bond


Question 4

Water (H2O) is composed of the same elements as hydrogen peroxide (H2O2). Why do these substances have different properties?


A.The atoms are arranged differently in each molecule.


B. The molecules are the same.


C. The atoms are the same.


D.Water has more atoms than hydrogen peroxide.


Question 5

What is the definition of a chemical bond?


A. a mutual attraction between the nuclei and electrons in two different atoms


B. a mutual attraction between the nuclei and electrons in a single atom


C. a mutual repulsion between the nuclei and electrons in two different atoms


D. a mutual repulsion between the nuclei and electrons in a single atom

Answers

2.(A)These two opposite ions attract each other and form the ionic bond.Covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electronsbetween atoms and other covalent bonds
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