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
kifflom [539]
4 years ago
5

Dark energy is an unexplained force that is causing _____. stars to explode the expansion of the universe to accelerate the univ

erse to contract galaxies to group together
Physics
2 answers:
GalinKa [24]4 years ago
3 0
The best choice would be the second statement. Dark energy is an unexplained force that is causing the expansion of the universe to accelerate. It is an unknown form of energy which is the most accepted hypothesis during the 1990s to explain the observations that the universe is expanding at a rate that is accelerating.
Tatiana [17]4 years ago
3 0

Answer:

Dark energy is an unexplained force that is causing the expansion of the universe to accelerate.

Explanation:

You might be interested in
Approximately how much electrical energy does a 5-W lightbulb convert to radiant and thermal energy in one hour?​
k0ka [10]

Answer:

18,000 j

Explanation:

the lightbulb dissipates 5W of power

P = ΔE / Δt

rearrange to solve for energy

ΔE = PΔt

P = 5W

t =  1 hour = 60 minutes = 3600 seconds

ΔE = 5 * 3600

ΔE = 18000 J

8 0
3 years ago
At 13:20 on the last Friday in September, 1989 a frantic call was received at the local police station. There had been a serious
astraxan [27]

The kinematics and conservation of momentum relationships allow to find the results for the questions about the measurements and conditions to know the accident conditions are:

     1) The principles of conservation of momentum  and kinematics.

     2)  \theta = tan^{-1} \frac{P_{01}}{p_{02}}

     3) The factors that influence the direction and distance traveled are:

         The initial speed of the vehicles

         The mass of the vehicles

         Pavement conditions: dry, wet, humid, with dirt or loose sand.

1) Kinematics studies the movement of bodies, they look for relationships between position, speed and acceleration.

To analyze the accident, you must answer a question such as what speed the vehicles had before the accident, this is the initial speed of each one and their directions.

When reviewing the kinematics relationships we have.

        v^2 = v_o^2 - 2 a x  

Where the acceleration is given by Newton's second law.

        fr = m a

The friction force is given by the expression.

       fr = μ N  

       fr = μ mg

       

Let's Substitute.

         μ m g = m a

         a = μ g

The friction coefficient is tabulated, for different types of rubber, pavement and wet,  dry conditions, etc.

Therefore, the researcher must measure the braking distance of the vehicles, which can be taken from the mark of the tires on the road and note the condition of the pavement if it is dry or wet and the visibility of the day.

This is the speed of the vehicles just after the impact, using the law of conservation of momentum you can find the speed of the vehicles before the impact

        p_o = p_f \f

         

Where this is a vector expression, which in general is solved with the components of each directional.

Consequently to answer the questions you must use the principles of conservation of momentum  and kinematics.

2) If the vehicles travel at right angles and their masses are similar, the direction after the collision  in each direction.

           tan \theta = \frac{p_{01}}{p_{02}}  

           \theta = tan ^{-1} \frac{p_{01}}{p_{02}}  

3) The factors that influence the direction and distance traveled are:

     The initial speed of the vehicles

     The mass of the vehicles

     Pavement conditions: dry, wet, humid, with dirt or loose sand.

In conclusion, using the kinematics and conservation of momentum relationships, we can find the answers to the question about measurements and conditions to know the accident conditions are:

      1) The principles of conservation of momentum  and kinematics.

     2)  \theta = tan^{-1} \frac{P_{01}}{p_{02}}

     3) The factors that influence the direction and distance traveled are:

         The initial speed of the vehicles

         The mass of the vehicles

         Pavement conditions: dry, wet, humid, with dirt or loose sand.

Learn more about kinematics and momentum here:   brainly.com/question/17304001

5 0
3 years ago
Differentiate between:<br><br>a. Compression and Rarefaction<br>​
zlopas [31]

Answer:

Explanation:

Compression

The region in a medium where the distance between the vibrating molecules is minimum is compression.

This is the region with higher air pressure than the surrounding .

Rarefaction

The region in a medium where the distance between the vibrating molecules is maximum is rarefaction.

This is the region with relatively low air pressure.

hope it helps :)

7 0
3 years ago
A rare butterfly (0.01 kg) is slowly flapping its wings and moving across a road. An unsuspecting driver in a large car (1000 kg
aliya0001 [1]

Both the butterfly and the large car will have equal forces but in opposite direction.

<h3>Newton's third law of motion</h3>

Newton's third law of motion states that action and reaction are equal and opposite. That is, the force exerted on an object is equal to the reaction experienced by the object.

Fa = - Fb

where;

  • Fa is the force exerted by the large car
  • Fb is the force of the butterfly

Thus, both the butterfly and the large car will have equal forces but in opposite direction.

Learn more about Newton's third law of motion here: brainly.com/question/25998091

#SPJ1

8 0
2 years ago
Anyone please ??? ASAP 15 points ???
Fed [463]

Answer:

1) you could put more force behind it. (increase) 2) have another object interact with that object. (increase or decrease) 3) the object could hit a wall and stop or slow down (decrease)

Sorry if wrong

5 0
3 years ago
Other questions:
  • A flap of tissue that prevents blood from flowing back is a(n)________ .
    6·1 answer
  • A tire that has been run flat has just been removed from an Alcoa aluminum rim. Technician A states to roll the rim on a flat le
    8·1 answer
  • 1 .how did the methods of early structuralists and functionalists differ? name a psychologist that took each approach.
    6·1 answer
  • Wich type of solar radiation is the least powerful
    15·1 answer
  • 16 N is directed 30 degrees above the x axis. The y component of the force is?
    9·1 answer
  • A one-piece cylinder has a core section protruding from the larger drum and is free to rotate around its central axis. A rope wr
    11·1 answer
  • Light strikes a flat mirror with an angle of incidence of 73º. At what angle does it reflect off at?
    9·1 answer
  • im a boy and does anyone want to be my gf im 13 and in 7th grade and if you dont i get and if you want to yell at me i get
    14·1 answer
  • explain the surprising realization scientists are making about bacteria and what Danino hopes to eventually be able to do using
    13·1 answer
  • Other than temperature, which property also has an effect on the rates of chemical reactions?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!