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ladessa [460]
3 years ago
9

Astronomers have proposed the existence of an unexplained force that is causing the expansion of the universe to accelerate. Wha

t do they call this force?
A) dark matter
B) dark space
C) dark stars
D) dark energy
E) dark holes
Physics
2 answers:
Anestetic [448]3 years ago
6 0

Answer:

D Dark Energy

Explanation:

The expansion of the universe is explained on the basis of dark energy.

A force that is responsible for the expansion of the universe is named as the Dark energy. It is only a hypothetical form of energy. It seems to oppose gravity by exerting a negative and repulsive pressure.

Accelerated expansion of the universe is caused by the dark energy. Dark energy contributes to atleast 68% of the total energy that exists in the present day observable universe. These are details that are presented by the Standard model of Cosmology.

Dark matter neither emits nor absorbs light. It exerts immense gravity.

irakobra [83]3 years ago
4 0
The answer to your question would be D. Dark Energy

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Despite the gases, dust, and stars that compose the universe, it is still mostly made up of ____________________.
ivann1987 [24]

Answer:

space

Explanation:

5 0
3 years ago
A ball is launched from ground level and hits the ground again after an elapsed time of 4 seconds and after traveling a horizont
jeka94

Answer:

1)a. It is constant the whole time the ball is in free-fall.

2)b. = 14 m/s

3) e. = 19.6 m/s

Explanation:

1) given that the only force acting on the ball is gravity, gravity acts along the vertical axis. Since no other force acts on the ball then the horizontal velocity will remain constant all through the flight since there is no horizontal force acting on the ball.

2) speed = distance/time

horizontal distance = 56m

Time = 4 seconds

Speed = 56m/4s = 14m/s

3) acceleration due to gravity g = 9.8m/s^2

Initial vertical velocity = u

Final vertical velocity = v = -u

Using the law of motion;

v = u + at

a = acceleration = -g = -9.8m/s^2

t = time of flight = 4

Substituting the values;

-u = u - 4(9.8)

-2u = -4(9.8)

u = -4(9.8)/-2

u = 2(9.8) = 19.6 m/s

Initial vertical velocity = u = 19.6 m/s

3 0
3 years ago
How do you calculate acceleration
AfilCa [17]
A=f/m
Example a=10/2
A=5
7 0
3 years ago
Read 2 more answers
what velocity must a 1340kg car have in order to havw the same momentum as a 2680 kg truck traveling at a velocity of 15m/s to t
kykrilka [37]
Car with a mass of 1210 kg moving at a velocity of 51 m/s.
2. What velocity must a 1340 kg car have in order to have the same momentum as a 2680 kg truck traveling at a velocity of 15 m/s to the west? 3.0 X 10^1 m/s to the west.

Hope i helped
Have a good day :)

 
6 0
3 years ago
Một xe máy đang đi với v = 50,4 km/h bỗng người lái xe thấy có ổ gà trước mắt cách xe 24,5 m.Người ấy phanh gấp và xe đến ổ gà t
Finger [1]

Answer:

<h3>эмне, кечиресиз айым, бирок мен сиздин тилиңизди түшүнбөй</h3>
3 0
3 years ago
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