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Lady bird [3.3K]

3 years ago

15

Why does a metal spoon left on a bowl of hot soup become warm? A) Metal is a conductor. B) Metal is an insulator. C) Metal produ

ces its own heat. D) Metal heats up from magnetism.

2 answers:

Vlada [557]3 years ago

8 0

Answer:

a IT'S A

Explanation:

mr_godi [17]3 years ago

5 0

A: Metal is a conductor it hold the heat

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Which waves cause the medium to vibrate only in a direction parrallel?

34kurt

A longitudinal wave is a mechanical wave that causes the medium to vibrate parallel to the direction of the wave. Its wave’s forces travel through multiple rarefactions and compressions where compression is the closest distance in the longitudinal wave and rarefaction is the farthest distance apart in the said wave.

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3 years ago

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The H line in Calcium is normally at 396.9nm. however, in a star’s spectrum it is measured at 398,1 nm. How fast is the star mov

konstantin123 [22]

H line of Calcium spectrum is normally given as 396.9 nm

Now from a distant star we measured it as 398.1 nm

So here this change in the wavelength of distant star is due to Doppler's effect of light as per which when source of light moves towards the observer then the frequency of light received will appear different from its actual frequency

So here we can say as per Doppler's effect of light

$\frac{\Delta \nu}{\nu_0} = \frac{v}{c}$

$\frac{\nu' - \nu}{\nu_0} = \frac{v}{c}$

$\frac{\frac{1}{\lambda} - \frac{1}{\lambda'}}{\frac{1}{\lambda}} = \frac{v}{c}$

$\frac{\lambda' - \lambda}{\lambda'} = \frac{v}{c}$

given that

$\lambda' = 398.1 nm$

$\lambda = 396.9 nm$

$c = 3 * 10^8 m/s$

$\frac{398.1 - 396.9}{398.1} = \frac{v}{3*10^8}$

$v = 3*10^8 * \frac{1.2}{398.1}$

$v = 9.04 * 10^5 m/s$

so the start is moving away with speed 9.04 * 10^5 m/s because when wavelength is more than the real wavelength then its frequency is less which mean it is moving away from the Earth

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3 years ago

a) A Kuiper Belt Object orbits the Sun with an average orbital distance of 40 AU. What is its orbital period? Round your answer

denpristay [2]

Answer:

253 years

Explanation:

a = Distance in Astronomical units from the sun = 40 AU

P = Orbital period in years

From Kepler's law we have

$P^2=a^3$

$\Rightarrow P^2=40^3$

$\Rightarrow P^2=64000$

$\Rightarrow P=\sqrt{64000}$

$\Rightarrow P=252.982212813$

$\Rightarrow P\approx 253\ years$

The orbital period of the Kuiper belt object is 253 years.

7 0

3 years ago

A body moving in the positive x direction passes the origin at time t = 0. Between t=0 and t=1 second, the body has a constant s

lord [1]

The important thing in this type of questions is to keep track of what you are doing at every point.

From t=0 to t=1s, there is uniform motion at v=24 m/s.

Therefore, it will move 24m in that second of time.

Afterwards, an acceleration comes in, so from t=1s to 11s there will be uniformly accelerated motion with acceleration -6m/s^2.

To account for this, you need to use Suvat's equation:

x(t)=x0+v0*t+1/2*a*t^2.

You should know what to plug in for each of the symbols in this equation:

x0 [initial position at t=1s] = 24m

v0 [initial velocity at t=1s] = 24 m/s

a [acceleration, switched on at t=1s] = -6 m/s^2

t [time from the start of the acceleration until the end, i.e. from t=1s to t=11s] = 10s

Plugging in those numbers in the equation will give you the position at t=11s.

4 0

3 years ago

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HELP PLEASE ASAP !!!!Question 5 of 15

lesantik [10]

I think the answer is C

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3 years ago

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