1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kodGreya [7K]
3 years ago
6

Segmented mirrors sag under their own weight. their optical shape must be controlled by computer-driven thrusters under the mirr

ors in what is called an achromatic lens. active optics. a schmidt-cassegrain design. a newtonian design. interferometry.
Physics
1 answer:
madam [21]3 years ago
6 0
Active Optics.


Hope that helps, Good luck! (:
You might be interested in
A third wire of the same material has the same length and twice the diameter as the first. How far will it be stretched by the s
leonid [27]

Complete question is;

A force stretches a wire by 0.60 mm. A second wire of the same material has the same cross section and twice the length.

a) How far will it be stretched by the same force?

b) A third wire of the same material has the same length and twice the diameter as the first. How far will it be stretched by the same force?

Answer:

0.15 mm

Explanation:

According to Hooke's Law,

E = Stress(σ)/Strain(ε)

Where E is youngs modulus

Formula for stress is;

Stress(σ) = Force(F)/Area(A)

Formula for strain is;

Strain(ε) = Change in length/original length = (Lf - Li)/Li

We are also told that a second wire of the same material has the same cross section and twice the length.

Thus;

Rearranging Hooke's Law to get the constants on one side, we have;

F/(AE) = ε

Thus from the conditions given;

ε1 = 0.6/Li

ε2 = (Change in length)/(2*Li)

And ε1 = ε2

Thus;

0.6/Li = Change in length/(2*Li)

Li will cancel out and we now have;

Change in length = 2 × 0.6 = 1.2 mm

Finally, we are told A third wire of the same material has the same length and twice the diameter as the first.

Area of a circle;A1 = πd²/4

Now, we are told d is doubled.

Thus, new area of the new circle is;

A2 = π(2d)²/4 = πd²

Rearranging Hooke's Law,we have;

F/A = εE

Since F and E are now constants, we have;

F/E = constant = Aε

Thus;

A1(ε1) = A2(ε2)

A1 = πd²/4

e1 = 0.60/Li

A2 = πd²

e2 = Change in length/Li

Thus;

((πd²/4) × 0.6)/Li = (πd² × Change in length)/ Li

Rearranging, Li and πd² will cancel out to give;

0.6/4 = Change in length

Change in length = 0.15 mm

4 0
3 years ago
What is process that involves the collection of information and ideas supported by belief or opinion for science?
Fynjy0 [20]
The answer is pseudoscience
4 0
3 years ago
For each pair of vehicles, choose the vehicle that would experience the greatest force of impact in a collision. Type your answe
velikii [3]

Answer:

I need help on this tooo

Explanation:

8 0
3 years ago
एक वाक्य में उत्तर लिखिए : 1. आज किसको बचाने की मांग है? 2. जीव कब तक जगत में रह सकता है? १. कवि किसको शुद्ध रखने की बात करते है
lilavasa [31]

Answer:

I can't understand

my friend

5 0
3 years ago
Read 2 more answers
A. How long does it take light to travel through a 3.0-mm-thick piece of window glass?
hodyreva [135]

Answer:

a) 1.517\times10^{-11} s

b) 3.41 mm

Explanation:

a)

We take the speed of light, c = 3.0\times10^8 m/s and the refractive index of glass as 1.517.

Speed = distance/time

Time = distance/speed

Refractive index, n = speed of light in vacuum / speed of light in medium

n=\dfrac{c}{s}

s=\dfrac{c}{n}

t=\dfrac{d}{c/n}

t=\dfrac{dn}{c}

t=\dfrac{3\times10^{-3}\times1.517}{3.0\times10^8}

t=1.517\times10^{-11}

b)

We take the refractive index of water as 1.333.

Speed in water = speed in vacuum / refractive index of water

Distance = speed * time

d=s\times t

d=\dfrac{c}{n_w}\times \dfrac{3\times10^{-3}\times1.517}{c}

d=\dfrac{3\times10^{-3}\times 1.517}{1.333}

d = 3.41 mm

6 0
3 years ago
Other questions:
  • Write a speech about bringing back fidget toys because they're banned in school
    13·1 answer
  • If an object in space is giving off a frequency of 10^13 wavelength of 10^-6 what will scientist be looking for?
    9·1 answer
  • Which term describes a substance that has a low melting point and poor electrical conductivity?
    6·1 answer
  • What factors affect the ability of a substance to transfer thermal energy to heat or be heated by it's surroundings?
    15·1 answer
  • Angular diameter of the Sun from the Earth orbit is approximately 32′ (arc minutes), and the solar constant is 1.36kWt/m2 . (a)
    5·1 answer
  • Which graph shows a negative acceleration
    10·1 answer
  • What erases the impact craters on earth and is responsible for most of the landforms that we see?
    14·1 answer
  • A patient is administered 20 mg of iodine-131. How much of this isotope will remain in the body after 40 days if the half-life f
    9·1 answer
  • Describe what happens when your circuit is completed. Tap on one of the wires with your mouse. Describe what happens. Explain yo
    6·1 answer
  • What is the relationship between frequency and pitch?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!