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erica [24]
2 years ago
4

In a vehicle traveling at 20 miles per hour, the force of your car impacting a surface is ______ times as great as at 10 mph.

Physics
2 answers:
leonid [27]2 years ago
6 0

<u>Answer</u>

4

<u>Explanation</u>

The energy possessed by an object in motion is called kinetic energy.

Kinetic energy (K.E) = 1/2 mv²

Where m is the mass of the body and v is the velocity of the object.

For the vehicle traveling at 20 mph, its energy is;

K.E = 1/2×m×20² = 200m

For the vehicle moving at 10 mph, its energy is;

K.E = 1/2×m×10² = 50m

∴ 200m ÷ 50m = 4

It can be seen that the force of impact is 4 times greater.

I did not consider changing the units of velocity from mph to mps because am comparing the two energies. Even if I convert the velocities to mps, the answer would be same 4 times greater.


tangare [24]2 years ago
5 0

<u>Answer</u>

4

<u>Explanation</u>

The energy possessed by an object in motion is called kinetic energy.

Kinetic energy (K.E) = 1/2 mv²

Where m is the mass of the body and v is the velocity of the object.

For the vehicle traveling at 20 mph, its energy is;

K.E = 1/2×m×20² = 200m

For the vehicle moving at 10 mph, its energy is;

K.E = 1/2×m×10² = 50m

∴ 200m ÷ 50m = 4

It can be seen that the force of impact is 4 times greater.

I did not consider changing the units of velocity from mph to mps because am comparing the two energies. Even if I convert the velocities to mps, the answer would be same 4 times greater.


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Answer:

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F2=1400 N

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The given question is incomplete. The complete question is as follows.

A 6.70 −μC particle moves through a region of space where an electric field of magnitude 1500 N/C points in the positive x direction, and a magnetic field of magnitude 1.25 T points in the positive z direction.

A) If the net force acting on the particle is 6.21 \times 10^{-3} N in the positive x direction, find the components of the particle's velocity. Assume the particle's velocity is in the x-y plane.

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The given data is as follows.

           Q = 6.50 \times 10^{-6} C

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Also,       F_{net} = F_{E} - F_{b}

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Now, we will calculate the value of v as follows.

             v = (\frac{1}{B}) \times (E - \frac{F_{net}}{q})

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Using the value for velocity, we need to know which direction it's going.

You know +x direction for E, +z direction for B and +x for F_{net}.

Using the right hand rule where:

your right thumb goes toward the F_{net}, then your index finger points to B (z direction) Then curl your middle, ring, and pink 90 angle. This shows where v is going which is -y direction.

Thus, we can conclude that v_{x}, v_{y}, v_{z} = 0, -(458.507), 0.

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