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3 years ago

How Do The Northern Lights work?

Physics

1 answer:

pishuonlain [190]3 years ago

6 0

1.) Electrons go back into like a lower energy level then would be release a thing called a photon light.

2.) I'm not sure on the correct numbers exactly but if I remember correctly around 70-80 percent is nitrogen, around 20-25 is percent oxygen, 0.9 percent is argon, and 0.1 percent other gases.

3.) Glass is made from sand at least that's one popular element of making sand. one gathered, they are put into a high temperature and would soon make glass coming out of it within time.

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Two uniform solid spheres, A and B have the same mass. The radius of sphere B is twice that of sphere A. The axis of rotation pa

Svetach [21]

Answer:

Sphere B has 4 times more inertia than sphere A.

Explanation:

Inertia on a Solid sphere is given by:

$I = 2/5*M*R^2$

For this problem:

ma = mb = M

Rb = 2*Ra

With these values:

$Ia = 2/5*M*Ra^2$

$Ib = 2/5*M*(2*Ra)^2 = 4* (2/5*M*Ra^2)$

As you can see, Ib = 4 * Ia.

4 0

3 years ago

A rope is vibrating in such a manner that three equal-length segments are found to be vibrating up and down with 321 complete cy

kolbaska11 [484]

Answer:

<u>2.48 m</u> is the length of the rope.

Explanation:

Cycle period is 321

Time is 20 second

Wave travels at speeds = 26.4 m/s

We know that,

$\text { Frequency }=\frac{1}{T} \text { (For one cycle) }$

Frequency required for 321 complete cycle in 20 seconds is

$\text { Frequency }(f)=\frac{321}{20}$

Frequency = 16.05 hz

We know that,

$\text { Wavelength }=\frac{\text { wave velocity }}{\text { frequency }}$

$\lambda=\frac{v}{f}$

λ = wavelength, the distance between "wave crests" (m)

v = wave velocity, the "speed" that waves are moving in a direction (m/s)

f = frequency, (cycles/ or Hz)

$\lambda=\frac{26,4}{16.05}$

λ = 1.65 m

As per given question "length of the rope has three equal length segment"

$\mathrm{Length of the rope}=\frac{3}{2} \lambda$

$\mathrm{Length of the rope }=\frac{3}{2} \times 1.65$

$\mathrm{Length of the rope}=1.5 \times 1.65$

Length of the rope = 2.48 m

Therefore, length of the rope is <u>2.48 m.</u>

7 0

3 years ago

What will be the total resistance and current in a parallel circuit with a 15-volt battery and three 10-ohm resistors?

dsp73

Hello!

Recall for resistors in parallel:
$\frac{1}{R_t} = \frac{1}{R_1} + \frac{1}{R_2} + ... + \frac{1}{R_n}$

We can begin by calculating the total resistance:
$\frac{1}{R_t} = \frac{1}{10} + \frac{1}{10} + \frac{1}{10}}\\\\\frac{1}{R_t} = \frac{3}{10}\\\\R_t = \frac{10}{3} = \boxed{3.333 \Omega}$

Now, we can calculate the current using Ohm's Law:
$V = iR\\\\i = \frac{V}{R}$

V = Voltage of battery (V)
i = Current (A)

R = Resistance (Ω)

Plug in the given voltage and the total resistance we solved for.

$i = \frac{15}{3.33} = \boxed{4.5 A}$

8 0

2 years ago

In December, a city in the Southern Hemisphere has warm weather all month long. What causes this to happen?

viva [34]

Answer: C: There is a high concentration of the Sun’s rays in that region.

I just took the test.

Explanation:

5 0

3 years ago

Read 2 more answers

Besides the force due to gravity or g, what else determines the period of a pendulum?

Hoochie [10]

For a simple pendulum, the mathematical equation that describes the period (T) is T=√(l/g) where l is the length of the string and g is the acceleration due to gravity (9.81 metres per second). Therefore it can be seen that both gravity and the length of the string within a pendulum effects its period.

5 0

3 years ago

Read 2 more answers