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
Nookie1986 [14]
3 years ago
13

What is the mystery Greene discussion and why does he say it is something we should all care about ​

Physics
1 answer:
Step2247 [10]3 years ago
6 0

Answer:

The mystery that Greene discusses is that dark energy is causing the expansion of the universe to accelerate. However, this cannot be explained by the laws of Physics.

Explanation:

I majored in Physics

You might be interested in
The gravitational force between two spheres in outer space is 1000 n. how large would this force be if the mass of each sphere w
kipiarov [429]

The force will remain same if the mass of each sphere is doubled and the distance between them is doubled as well.

The force of gravitation between two spheres is given by

f=\frac{G m1 m2}{r^{2}}

m1= mass of first object

m2= mass of second object

r= distance between the masses

Now if each mass is doubled and the distance r is doubled as well

F'= \frac{G (2m1)(2m2)}{(2r)^{2}}

F'= \frac{4 G m1 m2}{4r^{2}}

F'=\frac{G m1 m2 }{r^{2}}

so F'= F

so the force remains same and is equal to 1000 N.

3 0
3 years ago
If the sum of the external forces on an object is zero, then the sum of the external torques on it
Zarrin [17]

Answer:

True.

Explanation:

If the sum of the external forces on an object is zero, then the sum of the external torques on it  must also be zero.

The net external force and the net external torque acting on the object have to be zero for an object to be in mechanical equilibrium.

Hence, the given statement is true.

5 0
3 years ago
A very rare type of lightning that appears as a reddish-colored sphere is called _____.
torisob [31]
<span>A very rare type of lightning that appears as a reddish-colored sphere is called   </span>A + Ball Lightening
5 0
3 years ago
Which of the following is an example of acceleration?
Naddika [18.5K]

Answer:

c

Explanation:

When a satellite is orbiting the earth , a constant force is being applied on it which means it must has acceleration. Also the direction of satellite is always being changed when it is orbitting to there is always change in the velocity vector which means acceleration.

You can view in the attached diagram to understand how the velocity is being changed.

7 0
3 years ago
How can we make a zero correction in a length of 5.30cm while the zero error is +0.05cm?​
rodikova [14]
Hi:)……………Hi:)……………Hi:)……………Hi:)……………Hi:)……………Hi:)……………Hi:)……………Hi:)……………
3 0
2 years ago
Other questions:
  • When a hydrogen atom absorbed a photon and the electron is excited, why the election's kinectic energy decreases instead of incr
    5·1 answer
  • In the Rolling Plains ecoregion of Texas, some parts of rivers are in deep canyons and others have bottoms that are close to the
    7·2 answers
  • A circus act involves a trapeze artist and a baby elephant. They are going to balance on a teeter-totter that is 10 meters long
    8·1 answer
  • How do we determine the amount of dark matter in elliptical galaxies?
    14·1 answer
  • two equal and unlike parallel forces of magnitude 34N act on a rigid body,such that the moment of couple is 8.50 Nm. calculate t
    12·1 answer
  • If a coin has a mass of 29.34g and drops from a height of 14.7 meters, what is its loss in gravitational potential energy? Show
    5·1 answer
  • What happens when you split a hydrogen atom?
    10·2 answers
  • The atoms of which element typically form ion?<br><br> A.) CI<br> B.) Ar<br> C.) Xe<br> D.) Ne
    9·1 answer
  • A skateboarder traveling at 7.0 meters per second rolls to a stop at the top of a ramp in 3.0 seconds. What is the skateboarder’
    8·1 answer
  • Help me pleas. Help me
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!