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2 years ago

They don't have an Astronomy Section and I believe that this falls the closest to Physics

1 answer:

5 0

The only thing we know of so far that can shift light to longer wavelengths is the "Doppler" effect. If the source and the observer are moving apart, then the observer sees wavelengths that are longer than they should be. If the source and the observer are moving toward each other, then the observer sees wavelengths that are shorter than they should be. It works for ANY wave ... sound, light, water etc. The trick is to know what the wavelength SHOULD be. If you know that, then you can tell whether you and the source are moving together or apart, and you can even tell how fast. If the lines in a star"s spectrum are at wavelengths that are too long, then from everything we know right now, the star and Earth are moving apart.

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If you operate a 2.0 kilowatt for 2 hours how much energy do you use

kap26 [50]

Answer:

4 kWh/day

Explanation:

hope this helps!

~mina-san

3 0

2 years ago

In 2014, about how far in meters would you have to travel on the surface of the Earth from the North Magnetic Pole to the Geogra

pogonyaev

Answer:

267.07 km

Explanation:

We have given the radius of the earth = 6378.1 km

In 2014 the difference between the magnetic north pole and geographical north pole is 2.40°

2.40° $=2.40\times \frac{\pi }{180}=0.041866 radian$

We know that linear distance is given by $S=R\Theta =6378.1\times 0.041866=267.07km$

So we have to travel 267.07 km in going from magnetic north pole to geographic north pole

3 0

2 years ago

A freely suspended magnet does not point exactly at the geographical N-S direction

elena-s [515]

Because their is nothing at the geographical poles that attracts the magnet

6 0

2 years ago

What defines "the time of full wave"

eimsori [14]

Answer:

A) Periodic time

Explanation:

Wavelength is the distance from a point on a wave to the same point on an adjacent wave

Wave speed is the speed the wave is travelling at

Wave frequency is how many waves pass a fixed point in a given time period

6 0

2 years ago

If an airplane with a mass of 5 tons has gravitational potential energy of 1000 kilojoules, what is its height?

VLD [36.1K]

The gravitational potential energy of an object, measured with respect to the ground, is given by
$U=mgh$
where m is the object's mass, g is the gravitational acceleration and h is the height of the object measured from the ground.

In our problem, the mass of the plane is m= 5 tons = 5000 kg, while the potential energy is
$U=1000 kJ=1 \cdot 10^6 J$
so we can re-arrange the previous formula and use these data to calculate h, the height of the airplane:
$h= \frac{U}{mg}= \frac{1 \cdot 10^6 J}{(5000 kg)(9.81 m/s^2)} =20.39 m$

3 0

3 years ago