All categories

3 years ago

Is it accurate to describe the physical universe as composed of only matter and energy?

1 answer:

8 0

Yes, this is accurate. While "dark matter" might exist, it is still more of a theory, it is not yet defined properly. As far as we truthfully know, the entire universe is just matter and energy.

You might be interested in

Three identical train cars, coupled together are rolling east at 2.0 m/s. A fourth car traveling east at 4.0 m/s catches up with

Ann [662]

Answer:

The value is $v = 2 \ m/s$

Explanation:

From the question we are told that

The velocity of the each of the three cars is $u_1 = u_2 = u_3 = 2 \ m/s$

The velocity of the fourth car is $u_4 = 4 \ m/s$

The initial velocity of the fifth car $u_5 = 0 \ m/s$

Generally from the law of momentum conservation we have that

$m_1 u_1 + m_2 u_2 + m_3 u_3 +m_4u_4 + m_5u_5 = [m_1 + m_2 + m_3 +m_4+ m_5]v$

Given that the cars are identical then their mass will be the same

i.e

$m_1 =m_2 = m_3 = m_4 = m_5 = m$

=> $[u_1 + u_2 + u_3 +u_4 + u_5]m = 5mv$

=> $2+ 2 + 2 +4 + 0 = 5v$

= > $v = 2 \ m/s$

8 0

3 years ago

Đoạn dây dẫn thẳng có dòng điện I chạy qua, đặt trong từ trường

umka21 [38]

A straight piece of wire with a current I flowing through it is placed in a magnetic field

A straight piece of wire with a current I flowing through it is placed in a magnetic fielduniform and perpendicular to the magnetic field lines. Magnetic force acting on the string

A straight piece of wire with a current I flowing through it is placed in a magnetic fielduniform and perpendicular to the magnetic field lines. Magnetic force acting on the stringthere is a way

4 0

3 years ago

There is concern that extra additives in detergents can

shtirl [24]

Answer:

Look below.

Explanation:

If additives are having negative effects on health and the environment, it would be wise to not use detergents containing these additives. These additives could threaten living things such as humans and animals.

4 0

3 years ago

I forgot to post the pic But please help just need answers

r-ruslan [8.4K]

Answer:

1.127,56,000m

2. 347,600,000

3. 384,000

4. 200000000

5. 16,000,000cm

6. 36,000,000cm

7. 125,000m long, 400m deep, 1,500m wide

8. 11.18km/sec

9. 5,400,000

10. 2g

11. 1,200 mg to 2700 mg

12. 158000 kg

13. 450000000 mg

14. 23,000g to 90,000g

15. 40,000 ML

16. 1,000 ML

17. 26,600 KL

18. 1,558,000 L

19. 60 ML

20. 0.947

5 0

3 years ago

You buy a magnifying glass at the store. The lens in the magnifying glass is a double convex lens, a lens with two convex curved

Leokris [45]

Answer:

30 cm

Explanation:

f = Focal length = 25 cm

R = Radius of curvature (both sides are equal)

$\mu$ = Refractive index of lens = 1.6

The lens maker formula is given by

$\frac{1}{f}=(\mu-1)(\frac{1}{R_1}-\frac{1}{R_2})\\\Rightarrow \frac{1}{f}=(\mu-1)(\frac{1}{R}-\frac{1}{-R})$ minus sign because it is on the other side

$\\\Rightarrow \frac{1}{f}=(\mu-1)\frac{2}{R}\\\Rightarrow R=2(\mu-1)f\\\Rightarrow R=2(1.6-1)\times 25\\\Rightarrow R=30\ cm$

The radius of curvature of the glass surface is 30 cm

8 0

4 years ago