What is overloading?
what is SQL joins?
what is overriding?
what is javascript?
what is the difference between manual and automation testing?
what is odd number???
Odd numbers are defined as any number which cannot be divided by two.
The most simple way to remember an odd number is ‘it is not a multiple of 2. The examples of odd numbers are 1, 3, 5, 7, etc
what is uipath?
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?
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.
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
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.