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Based on counting the number of galaxies in a small patch of the sky and multiplying by the number of such patches needed to cover the entire sky, the total number of galaxies in the observable universe is estimated to be approximately

A) 100 million.

B) 1 billion.

C) 10 billion.

D) 100 billion.

E) 1 trillion.

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Ciara Beatrice Canalita
Ciara Beatrice CanalitaLv10
17 Dec 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Question 4. You are driving your car at 45 mph. Your car has mass1435kg. You run into a car that has mass 1084kg and is going 55 mphin the opposite direction. The two cars lock bumpers, so they movetogether. No one hits the brakes. How fast will the cars move afterthe collision? Give your answer in mph to two decimal places.

Correct answer: 1.97

Question 5 (1 point)
If your distance from the center of a planet becomes 0.81 timeswhat it was before, what happens to your weight? Give the answer interms of the number by which you would multiply your originalweight. Express your answer in scientific notation, to threesignificant figures. E.g. if you move to 3.4 times as far from thecenter of the planet as you were before, your weight would bemultiplied by (1/3.4 squared) = 0.08650519=8.65E-2. This answer hasNO units


Correct answer: 1.52E0 (1.52 * 100)


Question 6 (1 point)
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Correct answer: 155.95


Question 7 (1 point)
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Correct answer: 4293.33


Question 8 (1 point)
If you weigh 142.2 lb on the Earth, what do you weigh on adifferent planet where the planet has mass 1.0 times as much asEarth's and radius 0.5 times as large as Earth's. Give your answerin pounds to two decimal places.


Correct answer: 568.80


Question 9 (1 point)
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Correct answer: 6.76E0 (6.76 * 100)


Question 10 (1 point)
You hit the 8 ball and it moves East at 3.8 cm/sec. It hits the 3ball. After the collision, the 8 ball continues to move, but withspeed 2.3 in the East direction. How fast does the 3 ball move?Tell the answer to one decimal place and follow it by the directionthat it moves.


Correct answer: 1.5


Question 11 (1 point)
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Correct answer: -1.76E4 (-1.76 * 104)


  1. Please solve this as early as possible.

    (1). Light waves are electromagnetic waves that traval at 3. 00 x 10^8 m/s. The aye Is most sensitive to light having a wavelength of 5. 50 x 10^-7m. {a} Find the frequency of this light wave Hz = 

    Find  the frequency  of this light wave (HZ)
    and its period(S).

    2.The distance between two successive minima of a transverse wave is 3.00 m. Five full crest Intervals of the wave pass  given point along the direction of travel every 

    14.2 s.

    (a) Find the frequency of the wave Hz 

    (b} Find the wave speed m/s 
    3.

    A harmonic wave bs traveling slong a repe It is observed that the oscillator that generates the wave completes 36.0 vibrations In 35.0 s Also, a given maximum travels 430 cm along the rope in 9.0 s What Is the wavelength in cm ?

    4.

    A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a Frequency of

    8.54 x 10^4 Hz, and if the speed of sound in air is 343 m/s, what is the smallest Insect a bat can detect in mm ?

    5. A cork on the surface of 5 pond bobs up and down two times per second an Hippies having a wavelength of 9.50 cm .If the cork is 11.5 m fram shore, how long does it take a tipple passing the cork to reach the shore ?
      (        )S.

6. Ocean waves are traveling te the east at 4. 7 m/s with a distance of 19 m between crests. (a) With what frequency do the waves hit the front of a boat when the boat Is at anchor?
(          ) HZ 

(b) With what frequency do the waves hit the front of a boat when the boat Is moving westward at 1.5 m/s? 
 (          ) HZ

7.

A circus performer stretches s tightrope between two towers. He strikes ane end of the rope and sends a wave atong it toward the other tower He notes that It takes the

wave 0. 840 s to reach the opposite tower, 20.0 m away If s 1.00-m length of the rope has a mass of 0.260 kg, find the tension In the tightrope .
(            ) N ?.

8.  Transverse waves with a speed of 52. 0 m/s are to be produced on a stretched string A    5 .20-m length of string with a total mass of 0.0600 kg Is used. 

{a) What is the required tension in the string? 
(           )N
(b} Calculate the wave speed in the string if the tension Is 8. 00 N. 
    (             )m/s . ?

9.A wave of amplitude 0 .53 m interferes with a second wave of amplitude 0 .19 m traveling in the same direction. 

(a) What Is the largest resultant amplitude that can occur, and under what conditions will this maximum arise? 

(           ) m 

1.The two waves interfere destructively, 

2.The two waves interfere constructively. 

(b) What is the smallest resultant amplitude that cah occur, and under what conditions will this minimum arise? 
(             ) m

1.The two waves interfere destructively 

2.The two waves interfere constructively 


10.

A certain tuning fork vibrates at a frequency of 161 Hz while each tip of Its two prongs has an amplitude of 0. 724 mm .

(a) What ts the per od of this motlon?
(          )ms .

(b) Find the wavelength of the sound produced by the vibrating fork taking the speed of sound in alr to be 343 m/s.
  (          ) m .

  1. Please solve all questions  as early as possible.

    (1). Light waves are electromagnetic waves that traval at 3. 00 x 10^8 m/s. The aye Is most sensitive to light having a wavelength of 5. 50 x 10^-7m. {a} Find the frequency of this light wave Hz = 

    Find  the frequency  of this light wave (HZ)
    and its period(S).

    2.The distance between two successive minima of a transverse wave is 3.00 m. Five full crest Intervals of the wave pass  given point along the direction of travel every 

    14.2 s.

    (a) Find the frequency of the wave Hz 

    (b} Find the wave speed m/s 
    3.

    A harmonic wave bs traveling slong a repe It is observed that the oscillator that generates the wave completes 36.0 vibrations In 35.0 s Also, a given maximum travels 430 cm along the rope in 9.0 s What Is the wavelength in cm ?

    4.

    A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a Frequency of

    8.54 x 10^4 Hz, and if the speed of sound in air is 343 m/s, what is the smallest Insect a bat can detect in mm ?

    5. A cork on the surface of 5 pond bobs up and down two times per second an Hippies having a wavelength of 9.50 cm .If the cork is 11.5 m fram shore, how long does it take a tipple passing the cork to reach the shore ?
      (        )S.

6. Ocean waves are traveling te the east at 4. 7 m/s with a distance of 19 m between crests. (a) With what frequency do the waves hit the front of a boat when the boat Is at anchor?
(          ) HZ 

(b) With what frequency do the waves hit the front of a boat when the boat Is moving westward at 1.5 m/s? 
 (          ) HZ

7. A circus performer stretches s tightrope between two towers. He strikes ane end of the rope and sends a wave atong it toward the other tower He notes that It takes the

wave 0. 840 s to reach the opposite tower, 20.0 m away If s 1.00-m length of the rope has a mass of 0.260 kg, find the tension In the tightrope .
(            ) N ?.

8.  Transverse waves with a speed of 52. 0 m/s are to be produced on a stretched string A    5 .20-m length of string with a total mass of 0.0600 kg Is used. 

{a) What is the required tension in the string? 
(           )N
(b} Calculate the wave speed in the string if the tension Is 8. 00 N. 
    (             )m/s . ?

9.A wave of amplitude 0 .53 m interferes with a second wave of amplitude 0 .19 m traveling in the same direction. 

(a) What Is the largest resultant amplitude that can occur, and under what conditions will this maximum arise? 

(           ) m 

1.The two waves interfere destructively, 

2.The two waves interfere constructively. 

(b) What is the smallest resultant amplitude that cah occur, and under what conditions will this minimum arise? 
(             ) m

1.The two waves interfere destructively 

2.The two waves interfere constructively 


10. A certain tuning fork vibrates at a frequency of 161 Hz while each tip of Its two prongs has an amplitude of 0. 724 mm .

(a) What ts the per od of this motion?
(          )ms .

(b) Find the wavelength of the sound produced by the vibrating fork taking the speed of sound in alr to be 343 m/s.
  (          ) m .

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