TOP QUESTIONS AND ANSWERS FOR YOU

Science

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10th

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January 29, 2024

How do I solve this question: Calculate and compare the chemical energy of coal to its gravitational potential energy. Burning 1 kg of coal releases about 3 million joules of energy. If you could use all of the chemical energy to life another kg of coal, how high could you lift it?

Ria Agrawal

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Student

To compare the chemical energy of coal to its gravitational potential energy we nee to calculate the height to which 1 kg of coal can be lifted using the chemical energy released by burning 1 kg coal

Given Data:

The Chemical energy released by burning 1 kg of coal

E = 3 x 10^6 Joules

The mass of coal that is being lifted

m = 1 kg

acceleration due to gravity,

g = 9.81 m/s^2

The formula for gravitational potential energy (GPE)

GPE = mgh

Let's solve for h

h = GPE/mg

h = 3 x 10 ^6 /1 x 9.81

h = 3035812.69 meters

So, using all the chemical energy released by burning 1 kg of coal, we could lift another 1 kg of coal to a height of approximately 305,813 meters.

This comparison demonstrates the huge amount of energy that coal contains since it can raise its own weight to a height that is much higher than the Earth's atmosphere.

Science

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10th

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January 29, 2024

How would I calculate the velocity of a book when it hits the floor using:

a) F = ma and the force of gravity.

Why do you use the force of gravity?

b) gravitational potential energy and kinetic energy

Ria Agrawal

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Student

**a) F = ma and the force of gravity.**

F= ma = Force of gravity = mg

* m - mass of the book*

* g - Acceleration due to gravity *

Using equation of motion,

v^2=u^2?+2as

*v- Final velocity when book reaches the floor*

*u- Initial velocity = 0 *

*a- acceleration - In this case acceleration due to gravity - g ( approx.= 9.8 m/s^2)*

*s- distance travelled = h*

So,

v^2= 0^2 + 2gh

v^2 = 2gh

Solving for v

v = sqrt. (2gh) - velocity of book when it reaches floor calculated using force of gravity

Why do you use the force of gravity?

We use use force of gravity because it provides constant acceleration that book experiences during fall.

b) gravitational potential energy and kinetic energy

Gravitational potential Energy = GPE = mgh

* m - mass of the book*

* g - Acceleration due to gravity *

* h- distance travelled *

Kinetic Energy = KE = 1/2mv^2

When book hits the floor all KE will be converted in PE

So, KE = PE

mgh = 1/2 mv^2

gh = 1/2 v^2

Let's solve it of v

v^2 = 2gh

v = sqrt.2gh

In both the methods we arrive at same formula for the final velocity.

This consistency shows that whether you use Newton's laws of motion or the principles of energy conservation, you will obtain the same result for the velocity of the book just before impact.

Technology

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1st

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December 11, 2023

what is assembly file?

pooja test test murthy

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Teacher

An assembly file, also known as an assembly language file or assembly source file, is a text file that contains instructions written in assembly language. Assembly language is a low-level programming language that is specific to a particular computer architecture or processor. Each assembly language instruction typically corresponds to a single machine language instruction that the computer's central processing unit (CPU) can directly execute.

Technology

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2nd

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December 9, 2023

what is odd number?,,

Ravi N

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Student

An odd number is an integer that is not divisible evenly by 2, meaning that when you divide an odd number by 2, there is a remainder of 1.

Technology

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4th

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September 27, 2023

what is uipath orchestrator?

Ravi N

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Student

Maths

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10th

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September 24, 2023

Solve ||x+3|-4| by piece wise

Arushi Subramanyam

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Student

To solve the expression $||x+3| - 4|$ piecewise, we need to consider the cases when $x+3$ is positive and when it is non-positive.

When $x+3 \geq 0$: In this case, $|x+3| = x+3$. Therefore, $||x+3| - 4| = |x+3| - 4 = (x+3) - 4 = x - 1$.

When $x+3 < 0$: In this case, $|x+3| = -(x+3)$. Therefore, $||x+3| - 4| = |-(x+3) - 4| = |-x-7| = x + 7$.

So, the piecewise definition for $||x+3|-4|$ is:

$\begin{cases} x - 1 & \text{if } x + 3 \geq 0 \\ x + 7 & \text{if } x + 3 < 0 \end{cases}$

English

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12th

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September 5, 2023

I am trying to apply for a easy loan to further My education

Jacqueline Booth-Garland

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Student

you can get information from a bank in a more accurate way

Maths

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3rd

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September 1, 2023

what is odd number????

Ravi N

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Student

Maths

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3rd

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August 16, 2023

what is odd number????

Ravi N

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Student

the numbers which can not be divided completely by 2 are called odd numbers. (to simplify the numbers which can not be paired are called odd ones) example 1, 3, 5, 7, 9 etc.

English

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5th

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August 3, 2023

what is odd number?/

pooja test test murthy

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Teacher