Which of the following is an example of a measurement of velocity?A. 1 m.
B. 1 m/s.
C. 1 m/s².
D. 1 m/s north.

Final answer:

The electric fields at the points (5.0 cm, 0 cm), (-5.0 cm, 0 cm), and (0 cm, 5.0 cm) due to a -12 nC charge are -67.5x10^3 i^ N/C, 30x10^3 i^ N/C and -67.5x10^3 j^ N/C respectively.

Explanation:

The subject of this question is Electric Field, a part of physics. Specifically, we're looking at point charges and using the formula for the electric field due to a point charge, which is E = k|Q|/r², where k is the Coulomb's constant, Q is the charge and r is the distance to the point where the electric field is calculated.

1. At the position (5.0 cm, 0 cm), the distance from the charge is 4.0 cm. Thus, the electric field is E₁ = k|-12 x 10^(-9) C|/(0.04 m)² = -67.5 x 10^3 N/C. In terms of unit vectors, this is -67.5 x 10^3 i^ N/C, because the field points in the negative x direction.
2. At the position (-5.0 cm, 0 cm), the distance from the charge is 6.0 cm. Thus, the electric field is E₂ = k|-12 x 10^(-9) C|/(0.06 m)² = -30 x 10^3 N/C. In terms of unit vectors, this is 30 x 10^3 i^ N/C, because the field points in the positive x direction.
3. At the position (0 cm, 5.0 cm), the field is purely in the y-direction, and the point is 4.0 cm above the charge. Thus, the field is E₃ = k|-12 x 10^(-9) C|/(0.04 m)² = -67.5 x 10^3 N/C. In terms of unit vectors, this is -67.5 x 10^3 j^ N/C.

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Answer:

develop better communication skills

Explanation:

Hi Beck

The answer should be

Diffraction of light passing through a narrow opening

I hope that's help :)

Answer:

A _commutator_ is used in a motor to switch the direction of the magnetic field created by the current.

The rotating part of a motor that holds the electromagnets is called the __armature___.

Electric current passes through the _brushes_ and into the electromagnets in an electric motor.

A motor turns _electrical_ energy into _mechanical_ energy.

Explanation:

A commutator, which is a split ring rotary switching device, reverses the direction of the current between the external circuit and the rotor. Reversing the current reverses the magnetic field.

The armature comprises the rotating part of the motor and the electromagnets

A brush is the electrical contact for conducting current through the moving and stationary parts of an electric motor

An electric motor turns electrical energy into mechanical energy.

For this case, the first thing you should do is take into account the definition of normal force.

By definition, we have:

• The normal force is that which is exerted on an object that is perpendicular to the surface.

If we define the coordinate system as:

1. Horizontal axis points to the right
2. Vertical axis points up

Then An object resting on a wall can have normal force in a horizontal direction.

Answer:

The normal force is perpendicular to the surface. The direction can be horizontal. Example: an object on a wall.