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
sweet-ann [11.9K]
3 years ago
7

Explain why astronomers have deduced that galaxies contain a large quantity of dark matter

Physics
1 answer:
lisov135 [29]3 years ago
3 0
Dark matter is studied by astronomers by observing the effect it has on visible objects. This is because dark matter itself is not detectable. Astronomers think that some galaxies might have a lot of dark matter because of the unexplainable motion of stars in these galaxies. 
You might be interested in
Need help, marking brainliest:)
katrin2010 [14]

Answer:

Always

Explanation:

Unbalanced forces means an acceleration, meaning a change in speed!

5 0
3 years ago
An elevator lifts a total mass of 1800 kg, a distance of 60 m in 60 s. How much power does the elevator generate?
emmainna [20.7K]

Answer:

17640

Explanation:

Power = workdone/time

Power = (force x displacement)/time

Power = (mg x 60)/60

Power = (1800 x 9.8 x 60)/60

=> power = 17640 watt

3 0
3 years ago
Donovan claims that the immune system works with other body systems. Is he correct? Explain.
djverab [1.8K]
Yes it does work with the other body system
8 0
3 years ago
Read 2 more answers
Driving on asphalt roads entails very little rolling resistance, so most of the energy of the engine goes to overcoming air resi
trapecia [35]

Answer:

a)  F_p=882N

b)  P=4410W

c)  V_p'=24135 ,n=15.2\%

Explanation:

From the question we are told that:

Mass M=1500kg

Velocity v=4.9m/s

Coefficient of Rolling Friction \mu=0.06

a)

Generally the equation for The Propulsion Force is mathematically given by

 F_p=\mu*mg

 F_p=0.06*1500*9.81

 F_p=882N

b)

Therefore Power Required at

 V_p=5.0m/s

 P=F_p*V_p

 P=882*5

 P=4410W

c)

 V_p' =15mpg

 V_p'=15*\frac{1609}

 V_p'=24135

Generally the equation for Work-done is mathematically given by

 W=F_p*V_p'

 W=882*15*1609

 W=2.13*10^7

Therefore

Efficiency

 n=\frac{W}{E}*100\%

Since

Energy in one gallon of gas is

 E=1.4*10^8J

Therefore

 n=\frac{2.1*10^7}{1.4*10^8}*100\%

 n=15.2\%

7 0
3 years ago
An object is thrown straight up with an initial velocity of 3 m/s. what is its acceleration at its maximum height?
Mama L [17]
At it's maximum height the acceleration is still 9.8m/s. On the earths surface, all objects are constantly under acceleration due to gravity. It is perculiar, but true. Under acceleration, only the velocity changes (as a general rule).
6 0
3 years ago
Other questions:
  • A motorcycle weighs 2,009 newtons. The mass of the motorcycle is kilograms. Use g = 9.8 N/kg for gravity.
    8·2 answers
  • What is responsible for the hole in the ozone layer?
    13·2 answers
  • Draw and label a picture or make a real life model of something to display conservation of energy. Make sure it is something tha
    15·1 answer
  • Can someone answer this question?<br><br><br><br><br><br><br> {For me: question 48}
    13·1 answer
  • Help on 9 and 10! Please help me!
    10·1 answer
  • A parallel-plate capacitor has a plate separation of 1.5 mm and is charged to 600 V. If an electron leaves the negative plate, s
    8·2 answers
  • Which way does the Jet Stream blow across the United States? *
    15·1 answer
  • A bus moving on a straight road increases its speed uniformly from rest to 20m's over a time period of 1 min. The distance trave
    13·1 answer
  • WILL MARK BRAINLIEST Why do we see sedimentary rocks more often than igneous and metamorphic rocks?
    12·1 answer
  • Tara goes kayaking at sunrise. She rows 50 feet in 20 seconds. She transfers
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!