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Answer: There really aren't many ways to estimate how old the universe is but, astronomers start by looking at the oldest stars in the universe.

Explanation:

Answer:

The big bang 13.7 billion years ago

Explanation:

Everything started 13.7 billion years ago that is when the big bang started.

Answer:

(sorry if it's wrong)

Explanation:

Answer:

D

Explanation:

I have no explanation but  it should be right just like the core of earth

Answer:

Asthenosphere

Explanation:

B is the correct option

Answer:  mASS OF OBJECT = 5 KG

Explanation: BY USING FORmULA OF UNBALANCE FORCE

                             F = ma

                             10 = m x 2

                             m = 10 / 2

                             m =  5 kg

Answer:

angle of reflection is 20

Explanation:

because angle of incidence is equal to angle of reflection

To reduce friction between the moving parts of the machine.

Explanation:

a. F=kx

4=k (2×10^-3)

k= 2000 N/m

b. mg=kx

0.2 ×10 = k (4×10^-2)

2/(4×10^-2) =k

k=50 N/m

c. mg=kx

1×10 = k (2×10^-2)

½ × 10² =k

k=50N/m

Explanation:

I hope you benefit from me...

The various points on the heating curve corresponds to melting, boiling and vaporization.

A heating curve is a plot of temperature against  time. The heating curve reveals how the temperature of the body changes with time during heating.

The heating curve is not shown here hence the question is incomplete. However, we must note that The various points on the heating curve corresponds to melting, boiling and vaporization.

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Answer: I'm not exactly sure, but I would say the answer is

B. Throughout the heating curve (A --> E), kinetic energy is increasing.

Explanation: Throughout the entire heating curve diagram, it is not ALWAYS the kinetic energy increasing because Points B and D shows the potential energy increasing as it goes through the phase changes.

I'm sorry if it isn't right, but to lower the chances, I know for sure that the incorrect answers are C and D.

Option Z is correct. The stainless steel container was likely the hottest. Stainless steel is an excellent heat conductor because it quickly warms the substance.

Stainless steel is an excellent heat conductor because it quickly warms the substance or allows heat to travel through it. Stainless steel is also corrosion-resistant.

Foam, glass, and plastic, on the other hand, are all poor heat and electrical conductors. As a result, they do not allow heat to travel through.

As a result, we may deduce that, among the available possibilities, the stainless steel container was most likely the hottest.

Hence Option Z is correct. The stainless steel container was likely the hottest.

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PE = 1/2 kx²

mgh = 1/2 kx²

80.9.8.20 = 1/2 k.4²

k = 1960

The Answer is A

I just guessed and I think it's the right answer.

Answer:

C

put the object in fire to make solid to liquid

Answer:

most light waves are scattered or are either reflected

Explanation:

the light waves bounce after hitting the mirror.

Answer:

most light waves are reflected

explanation:

when light hits a mirror it bounces back at the same angle it hit this is called reflection refraction on the other hand Refraction is the bending of light

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Refraction is the bending of light

I can help you.

I can make a slides and send it to you. this is actually very simple. just takes some time. I can do it.

Acceleration be a

[tex]\\ \rm\Rrightarrow a=\dfrac{v-u}{t}[/tex]

[tex]\\ \rm\Rrightarrow a=\dfrac{1.8-1}{0.03}[/tex]

[tex]\\ \rm\Rrightarrow a=0.8/0.03[/tex]

[tex]\\ \rm\Rrightarrow a=26.67km/s^2[/tex]

Question :-

Answer :-

[tex] \rule {180pt} {2pt} [/tex]

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that the Initial Velocity of the Meteoroid is 1 km/s . Its Final Velocity is given 1.8 km/s . Time is given as 0.03 seconds . And, we have been asked to calculate the Acceleration of the Meteoroid .

For calculating the Acceleration , we will use the Formula :-

[tex] \bigstar \: \: \boxed{ \: \sf {Acceleration \: = \: \dfrac{ \: v - ᴜ \: }{ᴛ} \: }} \\ [/tex]

Where ,

Therefore , by Substituting the given values in the above Formula :-

[tex] \longmapsto \: \: \sf{Acceleration \: = \: \dfrac{ \: 1.8 \: - \: 1 \: }{0.03} } [/tex]

[tex] \longmapsto \: \: \sf{Acceleration \: = \: \dfrac { \: \: 0.8 \: \: }{ \: \: 0.03 \: \: } } \\ [/tex]

[tex] \longmapsto \: \: \sf{Acceleration \: = \: 26.72} \\ [/tex]

Hence :-

[tex] \underline {\rule {180pt} {4pt}} [/tex]

Explanation:

The gravity gives the pen a constant force pointing to the center of the earth. And because of Newton's Second law: The acceleration of an object is directly proportional to the force it receives, inversely proportional to its mass, and the direction of acceleration is the same as the direction of the force.

So the pen has a tendency to going straight down on the ground. I don't think it maintain a constant speed but a constant acceleration. And the rate of the acceleration is approximate 9. 8m/s^2.

And as for its inertia, Newton's original statement in Principia mathematica was that any body should remain in uniform motion in a straight line or at rest until an external force forces it to change its motion. Bodies are too lazy to move if you don't force them. The moment you let go of the pen, the initial speed is zero. And it gains a acceleration of 9. 8m/s^2

According Newton's law of inertia, the pen tends to continue in its state of motion or rest. Hence, the pen tends to move in a constant velocity.

Newton's first law of motion states that, every objects tends to continue on the state of motion or rest until an external force acts on it. This tendency of objects is called inertia.

We can experience inertia in many situations. A very common example is ,when a stationary bus move backward when it started quickly that it tends to stay on rest. Similarly we will move forward when the bus suddenly breaks.

The similar effect is encountered in the pen here. When it moves through the air, except the air resistance no other force to resist its motion and it tends to move in a constant speed.

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We can confirm that less massive molecules tend to escape from an atmosphere more often than more massive ones because they are moving faster.

This has to do with the energy of the molecules. Speed comes with its higher kinetic energy. This higher level of energy helps the molecules to escape by giving them enough energy to overpower the force of gravity acting upon them in the atmosphere.

Therefore, we can confirm that less massive molecules tend to escape from an atmosphere more often than more massive ones because they are moving faster.

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Answer:

Explanation:

temperature and energy: the only answer that mentions temperature is -

surface temperature and ocean temperature

atmospheric composition: the only answer that mentions air gases is -

carbon dioxide and other greenhouse gases

ocean and water: the only answers that mentions ocean is -

ocean acidification and sea level

cryosphere: cryo means cold and the only answers that mentions anything cold is -

sea ice and glaciers

that is a silly question: C

Metals¡¡¡¡¡¡¡¡¡¡¡¡¡¡

Atoms of which Ag and Ca will form metallic bonds in a compound. So, the correct option is C.

Metallic bond is defined as the type of chemical bonds, through which the atoms in metals are held together.

Here,

The metallic bond arises between two atoms, due to the electrostatic force of attraction between the conducting electrons and the metal ions.

The silver metal atoms, Ag are held together in their crystal by means of metallic bond.

The atoms of silver(Ag) and calcium(Ca) will form intermetallic bonds between them, when they are in a compound.

Compounds like Ca₅Ag₃ and Ca₃Ag, etc. can be formed through the intermetallic bonds.

Hence,

Atoms of which Ag and Ca will form metallic bonds in a compound.

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This question involves the concepts of potential energy, power, and time.

The power required to raise the load from the lowest level to the top floor is "264.16 KW".

The power required by the lift can be calculated by the following formula:

[tex]P = \frac{P.E}{t}[/tex]

where,

Therefore,

[tex]P=\frac{mgh}{\frac{h}{v}}\\\\P = mvg = (1600\ kg)(16.83\ m/s)(9.81\ m/s^2)[/tex]

P = 264163.68 = 264.16 KW

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Answer:

I would say 1 and 2. I am not sure so Im going with my gut and so should you:) lol

Explanation:

Moon will be seen next to that same star in 27.3 days. It is the time required for the Moon to orbit around the Earth.

The Moon is a natural satellite that needs approximately 27.3 days to complete a full orbit around the Earth planet.

Moreover, the Earth's planet needs approximately 365 days to reach a full orbit around its star, the Sun.

In consequence, both the Earth planet and its natural satellite (Moon) orbit around the Sun.

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as a blade? murcury because it stays liquid at room temp. it would be a puddle with a hanfle which is like... really dull

Answer:

B

Explanation:

The equation is equal to the work done by the engine of the car will be  (change in kinetic energy of the car) - (friction energy) (distance).

From the work-energy theorem, It is stated that The net work done is equal to the change in the kinetic energy.

[tex]\rm W_{net}=K_f-K_i[/tex]

The initial kinetic energy is [tex]\rm K_I[/tex]

The final kinetic energy is [tex]\rm K_f[/tex]

The equation equal to the work done by the engine of the car will be the subtraction of the change in kinetic energy of the car and the product of the frictional force and the distance.

[tex]\rm W_{net}=K_f-K_i - F_f \times d[/tex]

Hence option B is correct.

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Answer:

The speed (A) will decrease

V = F λ  (the frequency F remains the same to maintain continuity across the interface)

Therefore (C) the wavelength must decrease      

Note: n = speed of light in air / speed of light in medium

When a light wave enters a medium of greater optical density the two characteristics that are: (A) Speed, and (C) Wavelength will decrease in the wave.

It is given that a light wave enters a medium of greater optical density.

It is required to find the characteristics that will decrease.

It is defined as the type of waves such as sound waves or ocean waves but waves carry energy. Light does not need any medium to travel.

We know that:

[tex]\lambda =\frac{v}{f}[/tex]

Where Lamda (λ) = Wavelength

                        ([tex]v[/tex]) = Speed of wave

                        [tex](f)[/tex] = Frequency of the wave.

The frequency remains the same to maintain continuity across the interface.

thus Speed of wave and Wavelength will decrease.

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Answer:

A. 1.0x10^6 J

B. 53 W

C. 7.1x10^-2

D. 330 W

Explanation:

A) work done = mgh

so 71*9.8*1500=1.0x10^6 J

B) power = Work done/time

So P=1.0x10^6/19800 sec

P= 53 W

​

C) 1 HP =735 W

503 W= 7.1x10^-2 HP

D) efficiency =(output/ input) *100

so 16= (53/input) *100

input= 7.1x10^-2

Solution,

We know that,

[tex]f = ma \\ \frac{f}{m} = a \\ \frac{1000}{100} = a \\ 10 = a[/tex]

Therefore,

Acceleration produced will be 10m/s².

Answer:

the magnetic needle of a compass point to north and the other needle points to south

Explanation:

Explanation:

So ,plane mirror forms a virtual image.

Answer:

city streets