Explain why it is impossible to whirl a bung around
on the end of a string in such a way that the string
remains perfectly horizontal.

Answer:

A, C, D

Explanation:

A, C and D are true.

B is false as energy can neither be created nor destroyed.

Answer:

the same side as cars are traveling

:)

Answer:

1.27551m

Explanation:

This is a simple energy convertion problem. Since there is no friction, and assuming no air drag and other external factors, mechanical energy should be conserved in this system.

Thus, we get:

[tex]KE_{initial} + PE_{initial} = KE_{final} + PE_{final}[/tex]

We also know that the gravitational potential energy is equal to mgh, while the KE can be calculated using [tex]\frac{1}{2}mv^2[/tex]

One thing to note here, is that the final KE will be 0, as there is no velocity at the end. Furthermore, we also can set the initial PE as 0 as we are looking at relative height, and at the start it is at h=0.

[tex]KE_{initial} = PE_{final}[/tex]

Plugging in:

[tex]\frac{1}{2}*30*5^2 = 30*9.8*h[/tex]

Solving for h, we get 1.27551m

Answer:

25 cm

Explanation:

F = k q₁q₂/r²

Substituting values : let the distance be x.

3.6 = (9 x 10^9) (5 x 10^(-6) (5 x 10^(-6)) / x²

3.6 = (225 x 10^(9-6-6) )/x²

3.6 = (225 x 10^(-3) / x²

x² = 225/3.6 x 10^(-3)

x² = 62.5x10x10^(-4) [10^(-3)=10x10^(-4)]

x = √(625 x 10^(-4) )

x = 25 x 10^(-2)

Or, x = 25 cm

Answer:

FALSE

Explanation:

To answer this question we must clarify that for a given approach to exist there must be a transition between two atomic levels of the material.

For the emission, the transition between two determined states must also occur, therefore the radiation emitted is equal to that absorbed.

Consequently the statement is False

Answer:

w = 0.196 rad / s

Explanation:

To generate an acceleration similar to that of the earth, the station's centripetal acceleration must be equal to the acceleration due to gravity.

               a_c = v² / r = w² r

               a_c = g

we substitute

               g = w² r

               w² = g / r

               w = [tex]\sqrt { \frac{g}{r} }[/tex]

let's calculate

               w = √9.8/50

               w = 0.196 rad / s

therefore the station must rotate at that angular velocity so that the acceleration in the outer wall is equal to the ratio of gravity

Explanation:

The volume occupied by one mole of a substance (especially of a gas) is molar volume.

Hope it will help :)❤

Answer:

Solve:

1/2(.5)(36)+1/2(1)(144)=

1/2(.5)(196)+1/2(1)(x^2)

9+72=49+.5x^2

81=49+.5x^2

32=.5x^2

64=x^2

x=8 m/s

Thus, the speed of the second ball after the collision is 8 m/s.

Hope this helps! Good luck!

Many reasons. Here are a couple:

1.) Water depth for the draft of incoming ships/vessels so they do not run aground.

2.) Distance between sea level and bottom of structures such as bridges for vessels passing underneath.

Answer:

33.3

Explanation:

Potential energy =

mass × gravitational field strength × height

rearranged =

[tex] \frac{potential \ energy}{mass \: \times gravity} = height[/tex]

[tex] \frac{15000}{45 \times 10} [/tex]

(The earths gravitational field strength will always be 10)

=33.33333 recurring to 1dp its 33.3

Answer:

Explanation:

It goes thru the fluma

Answer:

a total of four nodes and three antinodes

Explanation:

please tell me if im incorrect i will fix it asap.

Answer:

yes

Explanation: Work is done when there is movement. Therefore it was work was being done.

Answer:

The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.

Explanation:

Answer:

Hey mate....

Explanation:

This is ur answer.....

According the NASA's StarChild Website, "The universe is a vast open space which contains all of the matter and energy in existence. The universe contains all of the galaxies, nebulae, stars, and planets. The exact size of the universe is unknown. Scientists believe the universe is still expanding outward.

The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.

Hope it helps u,

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Answer:1500 calorie

Explanation:

Given

volume of water [tex]V=50\ ml[/tex]

Initial temperature [tex]T_i=22^{\circ}C[/tex]

Final temperature [tex]T_f=52^{\circ}C[/tex]

We know,

specific heat of water is [tex]c=1\ calorie/gm-^{\circ}C[/tex]

the density of water is [tex]\rho=1\ gm/ml[/tex]

The heat required to raise the temperature

[tex]\Rightarrow Q=mc\Delta T\\\Rightarrow Q=\rho \cdot V\times c\times \Delta T\\\Rightarrow Q=1\times 50\times 1\times (52-22)\\\Rightarrow Q=1500\ cal.[/tex]

1500 calories is required

Answer:

Coal

Explanation:

Answer:

T = 526°C

Explanation:

Given the following data;

Temperature in Kelvin = 250K

To convert kelvin to centigrade;

Temperature can be defined as a measure of the degree of coldness or hotness of a physical object. It is measured with a thermometer and its units are Celsius (°C), Kelvin (K) and Fahrenheit (°F)

Mathematically, it is given by the formula;

250 = 273 + C

Substituting into the equation, we have;

C = 273 + 250

T = 526°C

Answer:

4. Glycolysis

Explanation:

Cellular respiration can be defined as a series of metabolic reactions that typically occur in cells so as to produce energy in the form of adenosine triphosphate (ATP). During cellular respiration, high energy intermediates are created that can then be oxidized to make adenosine triphosphate (ATP). Therefore, the intermediary products are produced at the glycolysis and citric acid cycle stage.

Hence, the name of the process whose main purpose is to use energy released and stored during the Krebs cycle to form ATP is glycolysis.

Additionally, mitochondria provides all the energy required in the cell by transforming energy forms through series of chemical reactions; breaking down of glucose into Adenosine Triphosphate (ATP) used for providing energy for cellular activities in the body of living organisms.

Basically, oxygen goes into the body of a living organism such as plants, humans and animals when they breathe while glucose is absorbed by the body when they eat.

Answer:

the Krebs cycle

Answer:

kites where invented 2000 AD

so its A. 2000 AD

srry if it's wrong

Answer:

I guess no. A

Explanation:

approximately 2,800 years ago.

Answer:

it was Ernest Rutherford

fjfjfj

Explanation:

rufifiriirifieif

Answer:it’s all of the above for the ck-12

Explanation:

Answer:

I THINK it's True

Explanation:

Because...

you can get fat...

Answer:

the answer would be c sry if it is wrong

Answer:

b

Explanation:

if it's over land and in polar region it's B

Answer:D

Explanation:

trust me