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3 years ago

an electromagnetic wave propagates in a vacuum in the x-direction. In what direction does the electric field oscilate

Physics

1 answer:

sweet [91]3 years ago

5 0

Answer:

The electric field can either oscillates in the z-direction, or the y-direction, but must oscillate in a direction perpendicular to the direction of propagation, and the direction of oscillation of the magnetic field.

Explanation:

Electromagnetic waves are waves that have an oscillating magnetic and electric field, that oscillates perpendicularly to one another. Electromagnetic waves are propagated in a direction perpendicular to both the electric and the magnetic field. If the wave is propagated in the x-direction, then the electric field can either oscillate in the y-direction, or the z-direction but must oscillate perpendicularly to both the the direction of oscillation of the magnetic field, and the direction of propagation of the wave.

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A 50n brick is suspended by a light string from a 30kg pulley which may be considered a solid disk with radius 2.0m. the brick i

igomit [66]

Brick is held at a position which is at height 2 m from the floor

Now it is released from rest and hit the floor after t = 4 s

Now the acceleration of the brick is given by

$y = v_i* t + 0.5 at^2$

$2 = 0 + 0.5 * a * 4^2$

$a = 0.25 m/s^2$

Now in order to find the tension in the string

we can use Newton's law

$F_{net} = ma$

$mg - T = ma$

$50 - T = \frac{50}{9.8}*0.25$

$T = 48.72 N$

part b)

Now for the pulley

moment of inertia= $\frac{1}{2}mr^2$

m = 30 kg

R = 2 m

I = $\frac{1}{2}*30*2^2$

I = 60 kg m^2

Now the angular speed just before brick collide with the floor

$w = \frac{v}{r}[\tex]here we have[tex]v = v_i + a* t$

$v = 0 + 0.25 * 4$

v = 1 m/s

Now we will have

L = angular momentum = I w = $I*\frac{v}{R}$

L = 60 * $\frac{1}{2}$

L = 30 kg m^2/s

8 0

3 years ago

On a planimetric map, the _____ is used to determine the actual distance between two points.

lawyer [7]

The answer in this question is scale. The scale is used to determine the actual distance between two points in a planimetric map. This map only represents the horizontal position of features. This is also called by others as the line map. This is usually consisted of man-made and natural features. These are from aerial shots by the use of modern technology. This map’s common features are street and water centerlines, sidewalks, culverts, utility lines, building footprints and vegetation. Sometimes, there are also other useful data attached in this map like titles of the properties, owner, assessed value, etc. It is because of these, this map becomes a storage of valuable data which can be easily and quickly accessed.

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4 years ago

Read 2 more answers

A cannon shoots an artillery shell with an initial velocity of 400 meters/second at an

OLga [1]

It will land at 14139.19 m away.

Explanation:

The expression for range d on level ground is given by;

d=v² sin (2Ф) /g where Ф is the fire angle and g is acceleration due to gravity

Given v=400m/s ,Ф= 60° and g=9.8 so,

d= 400² sin(120°) /9.8

d=(400²×0.86602540378) / 9.8