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2 years ago

Calculate the speed for a car that went a distance of 125 miles in

1 answer:

3 0

Speed = distance / time
= 125 miles / 2 hr
= 62.5 mi/h

Convert 65.5 mi/h to km/h

= 65.5 / 5
= 13.1
=13.1 x 8
= 104.8 km/h

Therefore speed equal 104.8 km/h

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Which pair of sentences is describing the same velocity? A car is parked. A car is moving in circles. A bus drives 40 miles per

olya-2409 [2.1K]

The bus and the truck have the same velocity.

Also, Valerie and Owen have the same velocity.

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3 years ago

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What represents the third dimension in a topographic map and shows elevation?

IgorC [24]

An object or any location can be represented on a two-dimensional surface like a paper or computer screen. This representation is known as map. Most maps do not take into account the elevation of the object or the location they representing. On the other hand, Topographic maps use contour lines to represent the third dimension and to show elevation change on or below the surface of the earth.

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3 years ago

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A wire 25.0cm long lies along the z-axis and carries a current of 9.00A in the positive +z-direction. The magnetic field is unif

marysya [2.9K]

The expression of the magnetic force and solving the determinant allows to shorten the result for the value of the magnetic force are:

In Cartesian form F = 2.46 i ^ - 0.605 j ^

In the form of magnitude and direction F = 2.53 N and θ = 346.2º

Given parameters.

Length of the wire on the z axis is: L = 25.0 cm = 0.25 m.

The current i = 9.00 A in the positive direction of the z axis.

The magnetic field B = (-0.242 i ^ - 0.985 j ^ -0.336 k ^ ) T

To find.

Magnetic force.

The magnetic force on a wire carrying a current is the vector product of the direction of the current and the magnetic field.

F = i L x B

Where the bold letters indicate vectors, F is the force, i the current, L a vector pointing in the direction of the current and B the magnetic field.

The best way to find the force is to solve the determinant, in general, a vector (L) is written in the form of the module times a unit vector.

$F= i |L| \left[\begin{array}{ccc}i&j&k\\L_x&L_y&L_z\\B_x&B_y&B_z\end{array}\right]$

Let's calculate.

$F= 9.00 \ 0.25 \ \left[\begin{array}{ccc}i&j&k\\0&0&1\\-0.242&-0.985&-0.336\end{array}\right]$

$F = 2.26 \ ( - 1 B_y i \ + 1 B_x j \ )$

F = 2.5 (0.985 i ^ - 0.242 j ^)

F = ( 2.46 i ^ - 0.605 j^ ) N

To find the magnitude we use the Pythagorean theorem.

F = $\sqrt{F_x^2 + F_y^2}$

F = $\sqrt{2.46^2 + 0.605^2}$

F = 2.53 N

Let's use trigonometry for the direction.

Tan θ ’= $\frac{F_y}{F_x}$

θ'= tan⁻¹ $\frac{F_y}{F_x}$

θ'= tan⁻¹1 ( $\frac{-.605}{2.46}$ )

θ’= -13.8º

To measure this angle from the positive side of the x-axis counterclockwise.

θ = 360- θ'

θ = 360 - 13.8

θ = 346.2º

In conclusion using the expression of the magnetic force and solving the determinant we can shorten the result for the value of the force are:

In Cartesian form F = 2.46 i ^ - 0.605 j ^

In the form of magnitude and direction F = 2.53 N and θ = 346.2º

Learn more here: brainly.com/question/2630590

5 0

2 years ago

In order to increase the amount of work completed, it is necessary to decrease the force applied to an object. decrease the time

wlad13 [49]

The answer to your question is: increase the force applied to the object.

Two items are provided as a basis for that conclusion:
1. According to Newton's Second Law of Motion, the formula for finding force is: F = ma
where F is the force,
m is the mass of an object,
and a is the acceleration of the object.

And 2: work = force x distance or W = F x d.

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3 years ago

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A major artery with a cross sectional area of 1.00cm^2 branches into 18 smaller arteries, each with an average cross sectional a

dybincka [34]

Here we can say that rate of flow must be constant

so here we will have

$A_1v_1 = 18 A_2v_2$