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
White raven [17]
3 years ago
8

Astronomers initially had difficulty identifying the emission lines in quasar spectra at optical wavelengths because

Physics
1 answer:
Rus_ich [418]3 years ago
6 0
No one expected violet & ultraviolet spectral lines to be shifted towards the red.
You might be interested in
How can a karate expert break a concrete block
FinnZ [79.3K]

Many ways, but some of the most famous are kicks (side, back, front, snap) or a smash.

Hope it helped! :)

8 0
3 years ago
Block A of mass M is on a horizontal surface of negligible friction. An identical block B is attached to block A by a light stri
miv72 [106K]

Answer:

T’= 4/3 T  

The new tension is 4/3 = 1.33 of the previous tension the answer e

Explanation:

For this problem let's use Newton's second law applied to each body

Body A

X axis

      T = m_A a

Axis y

     N- W_A = 0

Body B

Vertical axis

     W_B - T = m_B a

In the reference system we have selected the direction to the right as positive, therefore the downward movement is also positive. The acceleration of the two bodies must be the same so that the rope cannot tension

We write the equations

    T = m_A a

    W_B –T = M_B a

We solve this system of equations

     m_B g = (m_A + m_B) a

    a = m_B / (m_A + m_B) g

In this initial case

     m_A = M

     m_B = M

     a = M / (1 + 1) M g

     a = ½ g

Let's find the tension

    T = m_A a

    T = M ½ g

    T = ½ M g

Now we change the mass of the second block

    m_B = 2M

    a = 2M / (1 + 2) M g

    a = 2/3 g

We seek tension for this case

    T’= m_A a

    T’= M 2/3 g

   

Let's look for the relationship between the tensions of the two cases

   T’/ T = 2/3 M g / (½ M g)

   T’/ T = 4/3

   T’= 4/3 T

The new tension is 4/3 = 1.33 of the previous tension the answer  e

4 0
3 years ago
hi :) is it true that zero acceleration means the object can be moving at constant velocity or at rest?
nirvana33 [79]

Answer:

No

Explanation:

Please let me know if my answer is correct

7 0
3 years ago
Read 2 more answers
Lee has a mass of 40.0 kg and ice skates with a speed of 4.6 m/s.
faltersainse [42]

Their common speed is 1.53 m/s.

<h3>What is speed?</h3>

Speed can be defined as the ratio of the distance to the time of a body in motion.

  To calculate their final speed, we use the formula below.

Formula:

  • mu+m'u' = V(m+m')............. Equation 1

Where:

  • m = mass of the Lee
  • m' = mass of Mat
  • u = initial speed of Lee
  • u' = initial speed of Mat
  • V = Their common speed.

make V the subject of the equation

  • V = (mu+m'u')/(m+m')........... Equation 2

From the question,

Given:

  • m = 40 kg
  • m' = 80 kg
  • u = 4.6 m/s
  • u' = 0 m/s

Substitute these values into equation 2

  • V = [(40×4.6)+(80×0)]/(40+80)
  • V = 184/120
  • V = 1.53 m/s.

Hence, Their common speed is 1.53 m/s.

Learn more about speed here: brainly.com/question/3004254

6 0
2 years ago
A school track team member ran for a total of 15.85 miles in practice over 5 days. How many miles did he average per day?
liraira [26]

{\underline{\pink{\textsf{\textbf{ Answer : }}}}}

➡ 15.85/5

➡ 3.17 ans.

6 0
3 years ago
Other questions:
  • You are standing in front of a flat large mirror. As you step 1.0 m farther from the mirror, the distance between you and your i
    5·1 answer
  • Which type of rock is created when lava cools and hardens?
    10·2 answers
  • If the heart becomes damaged or weakened, how will this affect the body’s systems?
    14·2 answers
  • Describes earth magnetic field​
    15·1 answer
  • D. 'g' vanishes at centre of
    9·1 answer
  • The pressure at the bottom of a lake is 300 000 N/m2 more than at the surface of the lake. The lake is fresh water (density = 10
    7·1 answer
  • Darius' boat sails into the harbor with a speed of 80m/s. After 20 seconds, Darius' boat has come to a stop at the dock. What is
    14·1 answer
  • Help me with this please :)
    7·2 answers
  • A 200-kg boulder is 1000-m above the ground.
    12·1 answer
  • What happens to the deflection when we increase the number of turns of wire
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!