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3 years ago

How do scientists use the doppler effect to understand the universe?

Physics

2 answers:

Contact [7]3 years ago

8 0

Answer: The correct answer is A.

The correct answer is C.

Explanation:

Doppler effect is the phenomenon in which there is an apparent change in the frequency of the wave when there is a relative motion between the observer and the source.

Scientists use the Doppler effect to understand the universe by determining the motion of the object.

Therefore, the correct answer is A.

Light changes as the object in space (such as star) moves away from us then the light is shifted to red end. In this case, the light is shifted to longer wavelength.

Light changes as the object in space (such as star) moves towards us then the light is shifted to blue end. In this case, the light is shifted to shorter wavelength.

In the given problem, the when the stars are moving towards each other then the blue shift in the light will occur.

Therefore, the correct option is C.

Nadusha1986 [10]3 years ago

6 0

For the First answer, It would be "A"

The for the next one the answer is "C"

I hope this helps. :)

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the wheel of a car has a radius of .350 m. the engine of the car applies applies a torque of 295 N m to this wheel, which does n

maria [59]

The magnitude of static friction force is f_s = 842.8 N

Explanation:

Write down the values given in the question

The wheel of a car has radius r = 0.350 m

The car applies the torque is τ = 295 N m

It is said that the wheels does not slip against the road surface,

Here we apply a force of static friction,

It can be calculated as

Frictional force f_s = τ / r

= 295 Nm / 0.350 m

f_s = 842.8 N

6 0

3 years ago

What is the ratio of the sun’s gravitational pull on Mercury to the sun’s gravitational pull on the earth?

Marta_Voda [28]

Answer:

The answer is $\frac{F_{Sun-Mercury} }{F_{Sun-Earth} } =0,3709$ . Let's learn why.

Explanation:

Newton's law of universal gravitation says;

$F_{g} =G.\frac{m_{1}.m_{2}}{r^{2}}$

Here G is a universal gravitational <u>constant</u> and is measured experimentally.

Sun's gravitational pull on mercury is:

$F_{Sun-Mercury} =G.\frac{m_{sun}.3,30.10^{23}}{(5,79.10^{10})^{2} }$

Therefore $F_{Sun-Mercury} = Gm_{sun} 98,4366$

Sun's gravitational pull on Earth is:

$F_{Sun-Earth} =G.\frac{m_{sun} 5,97.10^{24} }{(1,50.10^{11}) ^{2}}$

Therefore $F_{Sun-Earth} =Gm_{sun} 265,33$

As a result;

$\frac{F_{Sun-Mercury}}{F_{Sun-Earth} }=\frac{Gm_{sun}98,4366}{Gm_{sun}265,33 } =0,3709$

4 0

3 years ago

The demand for your hand-made skateboards, in weekly sales, is q = −3p + 700 if the selling price is $p. You are prepared to sup

Y_Kistochka [10]

Answer:

you should sell your skateboards at $240

Explanation:

The price p to sell your skateboards for so that there is neither a shortage nor a surplus is the price that makes equal the quantity of sales and the quantity of supply, so p is equal to:

q (sales) = q (supply)

-3p + 700 = 2p - 500

700 + 500 = 2p + 3p

1200 = 5p

1200/5 = p

$240 = p

3 0

3 years ago

The radius of a small ball is around 3.79747 cm. The radius of a basketball is about 3.16 times larger. What is the ratio of the

Svetradugi [14.3K]

Explanation:

The ratio of the areas is the square of the ratio of the radii.

A/A = 3.16² = 9.99

The ratio of the volumes is the cube of the ratio of the radii.

V/V = 3.16³ = 31.6

3 0

3 years ago

Correct formula of Na(No3)2

ehidna [41]

Answer:

NaNO3.

Explanation:

The Na ion has one positive charge and the NO3 ion has one negative charge so the correct formula is NaNO3.

4 0

3 years ago