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Len [333]
4 years ago
5

if forces acting on an object are unbalanced, which factors may result from an unbalanced force? Check all that apply. The net f

orce is negative. The net force is zero. The net force is positive. There is a change in motion. There is no change in motion.
Physics
2 answers:
Alchen [17]4 years ago
8 0
The net force is negative, and there is a change in motion.
Nataly_w [17]4 years ago
8 0
<h3><u>Answer;</u></h3>
  • The net force is negative
  • The net force is positive
  • There is change in motion
<h3><u>Explanation;</u></h3>
  • <u>Balanced forces are forces that act in opposite directions and are equal in size. When an object is acted upon by unbalanced forces then the object stays still or at rest or continues moving at a constant velocity in the same direction.</u>
  • <u>Unbalanced forces cause an object or a body to change its motion or velocity and direction. Therefore, unbalanced force cause accelerations.</u>
<h3><u /></h3>
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Albert's laboratory is filled with a constant uniform magnetic field pointing straight up. Albert throws some charges into this
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Answer:

\vec{F}=qB(v_y \hat{i} - v_x\hat{j})

Explanation:

The force excerted by a magnetic field on a charged particle is given by the Lorentz force:

\vec{F} = q \vec{v} \times \vec{B}

Lets consider the z-direction of our coordinate system the same direction of the magnetic field, that is:

\vec{B} = B \hat{k}

Let us consider that the velocity of a given particle is:

\vec{v} = v_x\hat{i} + v_y \hat{j} + v_z \hat{k}

Therefore, since k×k = 0

\vec{v} \times \vec{B} = (v_x\hat{i} + v_y \hat{j} + v_z \hat{k}) \times B\hat{k}\\\vec{v} \times \vec{B}  =  (Bv_x \hat{i} \times\hat{k}) + (Bv_y \hat{j}\times\hat{k})

And since  i, j , k are a rigth hand system:

i × j = k

j × k = i

k × i = j  --> i × k= -j

\vec{v} \times \vec{B}  = Bv_x (-\hat{j}) + Bv_y \hat{i} =  Bv_y \hat{i} - Bv_x\hat{j}

Threfore, if the particle has charge q and velocity v = (vx,vy,vz), the magnetic force it will feel will be

\vec{F}=qB(v_y \hat{i} - v_x\hat{j})

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4 years ago
Your friend says that when someone drives a car, they use up energy. You know that this isn’t quite true. Develop an argument ag
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Answer:

Only about 12%–30% of the energy from the fuel you put in a conventional vehicle is used to move it down the road, depending on the drive cycle.

Explanation:

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3 years ago
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Which of Franz Mesmer’s claims about his mesmerism abilities eventually led to his downfall?
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He can mesmerize as well as magnatize trees, this is what he claims would lead to his downfall.

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1. In a particular experiment to study the photoelectric effect, the frequency of the incident light and the temperature of the
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Answer: 1. B. The number of electrons emitted from the metal per second increases.

2. The maximum speed of the emitted electrons increases.

The stopping potential increases

Explanation:

Photoelectric effect is simply referred to as the emission of electrons that occurs when there's an electromagnetic radiation. An example of such electromagnetic radiation is when material is being hit by light.

Assuming that the light incident on the metal surface causes electrons to be ejected from the metal, the number of electrons emitted from the metal per second increases if the intensity of the incident light is increased.

Also, if the initial light incident on the metal surface causes electrons to be ejected from the metal, the maximum speed of the emitted electrons increases and the stopping potential increases.

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Answer:

t = 13.43 s

Explanation:

In order to find the minimum time required by the plane to stop, we will use the first equation of motion. The first equation of motion is written as follows:

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where,

Vf = Final Velocity of the Plane = 0 m/s (Since, the plane finally stops)

Vi = Initial Velocity of the Plane = 95 m/s

a = deceleration of the plane = - 7.07 m/s²

t = minimum time interval needed to stop the plane = ?

Therefore,

0 m/s = 95 m/s + (- 7.07 m/s²)t

t = (95 m/s)/(7.07 m/s²)

<u>t = 13.43 s</u>

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