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PSYCHO15rus [73]
3 years ago
14

Please Answer Fast! Tomorrow is my exam!

Physics
1 answer:
ehidna [41]3 years ago
3 0
Average speed = Total distance/ Total time
Avg. speed = 20000/70 = 285.71
Avg. velocity = 0 as displacement is zero.


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An object has an angular velocity. It also has an angular acceleration due to torques that are present. Therefore, the angular v
shusha [124]

Answer:

 α = 0 ,    w = w₀

Explanation:

Torque is related to angular acceleration by Newton's second law for rotational motion.

        τ = I α

Where τ is the torque, I the moment of inertia and α the angular acceleration.

If we apply an external torque for the sum of all torques to be zero, the angular acceleration must fall to zero

         α = 0

 

Since the acceleration is zero, the angular velocity you have at that time is constantly killed.

           w = w₀ + α t

          w = w₀ + 0

8 0
3 years ago
Why doesn't the moon turn black during a total lunar eclipse? Explain your answer​
Alisiya [41]

Answer:

Thank me mark me brainliest

Explanation:

I did not explain because i got a photo

4 0
3 years ago
If the ultraviolet photon has a wavelength of 249 nm and one of the photons emitted by the fluorescent material has a wavelength
melamori03 [73]

Answer:

601 nm

Explanation:

Energy of photon having wavelength of λ nm

= \frac{1244}{\lambda}eV

Energy of 249 nm photon

=\frac{1244}{249}

=4.996 eV

Similarly energy of 425nm photon

=\frac{1244}{425}

=2.927 eV

Difference = 2.069 eV.

This energy will give rise to another photon whose wavelength will be

λ = \frac{1244}{2.069}

= 601 nm.

6 0
4 years ago
The rms current output in a circuit is 7.75 A. What is the maximum current?
Andru [333]
The maximum current in an ac circuit is related to the rms current by:
I_{rms} =  \frac{I_0}{ \sqrt{2} }
where I_{rms} is the rms current and I_0 is the maximum current.

If we re-arrange the formula and we use I_{rms}=7.75 A, we can find the value of the maximum current:
I_0 =  \sqrt{2} I_{rms} =  \sqrt{2}(7.75 A)=11.0 A
5 0
3 years ago
One of the foci for the moon's orbit would be the
suter [353]
The question is oversimplified, and pretty sloppy.

Relative to the Earth . . .
The Moon is in an elliptical orbit around us, with a period of
27.32... days, and with the Earth at one focus of the ellipse.

Relative to the Sun . . .
The Moon is in an elliptical orbit around the Sun, with a period
of 365.24... days, and with the Sun at one focus of the ellipse,
and the Moon itself makes little dimples or squiggles in its orbit
on account of the gravitational influence of the nearby Earth.

I'm sorry if that seems complicated.  You know that motion is
always relative to something, and the solar system is not simple.
5 0
3 years ago
Read 2 more answers
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