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makkiz [27]
1 year ago
12

Which describes Einstein’s second postulate about the special theory of relativity? The speed of light in a vacuum is constant,

and nothing is faster than the speed of light. The speed of light in a vacuum is constant, and some things are faster than the speed of light. The speed of light in a vacuum fluctuates, but nothing is faster than the speed of light. The speed of light in a vacuum fluctuates, and some things are faster than the speed of light.
Physics
2 answers:
crimeas [40]1 year ago
5 0

Answer:A

Explanation:

denis23 [38]1 year ago
4 0

Answer:

A

Explanation:

EDG 2021

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A horizontal 649 N merry-go-round of radius 1.05 m is started from rest by a constant horizontal force of 61.3 N applied tangent
nexus9112 [7]

Answer:

The kinetic energy of the merry-go-round is 632.82 J

Explanation:

Given;

weight of the merry-go-round, W = 649 N

radius of the merry-go-round, r = 1.05 m

applied horizontal force, F =  61.3 N

acceleration due to gravity, g = 9.8 m/s²

mass of  merry-go-round, m = W/g

                                               = 649/9.8  = 66.225 kg

moment of inertia of merry-go-round, I = ¹/₂mr²

                                                                 = ¹/₂ x 66.225 x (1.05)²

                                                                 = 36.507 kg.m²

Angular acceleration of the merry-go-round, α

τ = Iα = Fr

α = Fr / I

Where;

α is angular acceleration

α = (61.3 x 1.05) / 36.507

α = 1.763 rad/s²

Angular velocity of the merry-go-round, ω

ω = αt

ω = 1.763 x 3.34

ω = 5.888 rad/s

Finally, the kinetic energy of the merry-go-round, K.E

K.E = ¹/₂Iω²

K.E = ¹/₂ x 36.507 x (5.888)²

K.E = 632.82 J

4 0
2 years ago
What causes and electric current in a wire?<br><br> What causes and electric current in a wire?
sweet [91]

Answer:

All wires which have electric current flowing through them have electrons moving through the wire. The reason for why wires heat up when a current flows through them is that a battery converts chemical energy into electric potential energy.

Explanation:

3 0
2 years ago
What is the smallest sub atomic particle that orbit around the nucleus?
JulijaS [17]
Electron,a negative charged particles revolving around the nucleus.
5 0
2 years ago
Hello I wanna know what is the Newton first is also called the law ​
lorasvet [3.4K]

Answer:

What is another name for the first law of motion? Why is it given that name? Law of inertia. Page 2. It is given that name because inertia is the tendency of an object to resist any change in its motion until an unbalanced force acts on it.

Explanation:

6 0
1 year ago
A certain factory whistle can be heard up to a distance of 2.5 km. Assuming that the acoustic output of the whistle is uniform i
enyata [817]

Answer:

Emitted power will be equal to 7.85\times 10^{-5}watt

Explanation:

It is given factory whistle can be heard up to a distance of R=2.5 km = 2500 m

Threshold of human hearing I=10^{-12}W/m^2

We have to find the emitted power

Emitted power is equal to P=I\times A

P=I\times 4\pi R^2

P=10^{-12}\times 4\times 3.14\times  2500^2=7.85\times 10^{-5}watt

So emitted power will be equal to 7.85\times 10^{-5}watt

4 0
2 years ago
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