Mrs. Archer spent her Saturday running a bunch of errands. She started out by

Physics

1 answer:

Sedbober [7]3 years ago

3 0

Answer:

Velocity = displacement/time whereas speed is distance/time. use the formula

Explanation:

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What is the frequency of a wave that has a wave speed of 80m/s and a wavelength of 0.20m

IrinaK [193]

speed=frequency*wavelength, so frequency=speed/wavelength. frequency=80*0.2

Frequency = 16 Hz

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3 years ago

The Event Horizon Telescope needs a 22 micro-arcsecond resolution to view the event horizon regions around black holes. If the a

likoan [24]

Answer:

14869817.395 m

Explanation:

$\theta$ =22 microarcsecond

λ = Wavelength = 1.3 mm

Converting to radians we get

$22\times 10^{-6}\frac{\pi}{180\times 3600}\ radians$

From Rayleigh Criterion

$\theta=1.22\frac{\lambda}{D}\\\Rightarrow D=1.22\frac{\lambda}{\theta}\\\Rightarrow D=1.22\frac{1.3\times 10^{-3}}{22\times 10^{-6}\frac{\pi}{180\times 3600}}\\\Rightarrow D=14869817.395\ m$

Diameter of the effective primary objective is 14869817.395 m

It is not possible to build one telescope with a diameter of 14869817.395 m. But, we need this type of telescope. So, astronomers use an array of radio telescopes to achieve a virtual diameter in order to observe objects that are the size of supermassive black hole's event horizon.

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3 years ago

Jane described two substances which participate in photosynthesis. Substance A: Combines with water Substance B: Gaseous product

saul85 [17]

<span>I am pretty sure the correct answer is C.
It makes the most sense.
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3 years ago

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SOMEONE HELP PLEASE!!!!(15POINTS)

Bezzdna [24]

Answer: Friction

Explanation:

Friction is a force that opposes the motion of an object on another surface. For example, when a box is pushed along the floor, the floor exerts a frictional force on the box, "resisting" the motion of the box. This force is due to the contact between the molecules of the box and the molecules of the floor, and it is always directed against the direction of motion of the object (so, if the object is moving forward, friction acts backwards).

The magnitude of the friction force is given by:

$F=\mu N$