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3 years ago

According to Newton's First Law (the Law of Inertia) -

Physics

1 answer:

Nana76 [90]3 years ago

3 0

Answer:

Explanation:

I am snart plus I took the same test last year

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Which statement is a correct expression of the Law of Conservation of Mass?

DiKsa [7]

<span>The correct answer is B. The law of conservation of mass states that the mass of an isolated system is neither created nor destroy by chemical reaction or physical transformation. This means that the mass of subtances in an isolated system remains constant, it can not decrease and it can not increase.</span>

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4 years ago

Read 2 more answers

The amplitude of an electric field is 0.4 v/m 23 km from a radio transmitter. What is the total power emitted by the transmitter

ycow [4]

To solve this problem we will apply the concepts related to the relationship between the voltage, the electric field and the distance, once the voltage is found we will use the definition of power, which is defined as the square of the voltage over the resistance. This is,

$V=Ed$

E = Electric field

d= Distance between the points

Replacing,

$V=0.4*23000$

$V=9200 V$

Now applying the relation for power we have,

$P=\frac{V^2}{R}$

Here

V = Voltage

R = Resistance

Replacing,

$P= \frac{9200^2}{377}$

$P=224509.3 W$

Therefore the total power emmited by the transmitter is 224509.3 W

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3 years ago

Consider 3 polarizers. Polarizer 1 has a vertical transmission axis and polarizer 3 has a horizontal transmission axis. Taken to

kirill [66]

Answer:

Option D.) 0.09 I₀

Explanation:

The intensity, I, of a polarized light after passing through a polarizing filter is given by $I = I_{0} cos^{2} \theta$

$I_{0} =$ Original Intensity

$\theta =$ Angle between the direction of polarization and the axis of filter

After passing through the first polarizer, the initial intensity, $I_{o}$ is halved, i.e $I_{1} = \frac{I_{0} }{2}$

After passing through the second polarizer, the angle of polarization, θ = 30⁰

$I_{2} = I_{1} cos^{2} \theta$

$I_{2} = \frac{I_{0} }{2} cos^{2} 30\\I_{2} =\frac{3}{8} I_{0} \\I_{2} = 0.375 I_{0}$

After passing through the third polarizer, the angle of polarization, θ = 90⁰-30⁰ = 60⁰

$I_{3} = I_{2} cos^{2} \theta$

$I_{3} = 0.375I_{0} cos^{2} 60$

$I_{2} =0.09 I_{0}$

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4 years ago

What happens when a vector is multiplied by a scalar?

iogann1982 [59]

The scalar operates only on the magnitude of the vector.
So the length of the vector may change ... becoming longer
or shorter ... but its direction doesn't change.

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3 years ago

What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km? (the speed of light is 300,000 km/s.)?

expeople1 [14]

Frequency represents the number of complete oscillations in one second. it is measured in Hertz (Hz). Electromagnetic waves are waves which do not require a material media for transmission. They travel with a speed of light.
The speed (m/s) of a wave is given by frequency (Hz) × Wavelength (m)
Speed is 300,000 km/sec or 300,000,000 m/s and the wavelength is 300,000 km or 300,000,000 m.
Frequency = speed÷ wavelength
= 300000000 ÷ 300000000 = 1
Therefore, the frequency of the wave is 1Hz

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3 years ago