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Julli [10]
3 years ago
12

Which best describes how combustion works?

Physics
2 answers:
miv72 [106K]3 years ago
6 0

Answer: A) It breaks and forms bonds of fuel to release thermal energy.

Explanation:

Chemical energy is the energy stored in the bonds of molecules.

Thermal energy is the energy possessed by a body by virtue of its temperature.

Combustion is a chemical reaction in which a fuel is burnt in the presence of oxygen to form carbon dioxide, water and heat.

C_xH_y+x+\frac{y}{4}O_2\rightarrow xCO_2+\frac{y}{2}H_2O+Energy

Thus the chemical energy stored in the bonds of reactants is converted to thermal energy and heat is released in the combustion reaction.

jekas [21]3 years ago
3 0
The answer is A, it breaks down and releases thermal energy. 
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A car traveling in a straight line at an initial speed of 8.0 meters per second accelerates uniformly to a speed of 14 meters pe
Whitepunk [10]

The equation we can use here is:

v^2 = v0^2 + 2 a d

where v is final velocity, v0 is intial velocity, a is acceleration and d is distance

 

14^2 = 8^2 + 2 a (44)

<span>a = 1.5 m/s^2</span>

4 0
3 years ago
Read 2 more answers
A student pushes a 5 kg box initially at rest along a flat, rough table with a rightward force of 10 N. The frictional force act
Pie

Answer:

Please find attached pdf

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3 years ago
An aluminum cylinder with a radius of 2.7 cm and a height of 67 cm is used as one leg of a workbench. The workbench pushes down
soldier1979 [14.2K]

Answer:

1.9\times 10^{-4}

1.2\times 10^{-4}\ m

Explanation:

r = Radius = 2.7 cm

F = Force = 3.2\times 10^4\ N

A = Area = \pi r^2

\sigma = Stress = \frac{F}{A}

E = Young's modulus = 7\times 10^{10}\ Pa

\epsilon = Strain

L_0 = Original length = 67 cm

\Delta L = Change in length

Young's modulus is given by

E=\frac{\sigma}{\epsilon}\\\Rightarrow \epsilon=\frac{\sigma}{E}\\\Rightarrow \epsilon=\frac{\frac{3.2\times 10^4}{\pi 0.027^2}}{7\times 10^{10}}\\\Rightarrow \epsilon=0.0001996=1.9\times 10^{-4}

Strain is 1.9\times 10^{-4}

Strain is given by

\epsilon=\frac{\Delta L}{L_0}\\\Rightarrow \Delta L=\epsilon\times L_0\\\Rightarrow \Delta L=1.9\times 10^{-4}\times 0.67\\\Rightarrow \Delta L=0.0001273\\\Rightarrow \Delta L=1.2\times 10^{-4}\ m

The cylinder height decreases by 1.2\times 10^{-4}\ m

3 0
3 years ago
The distance around the block is equal to 3000 feet, how many blocks would you have to run to run a total of a mile?
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You would have to run a little less than 2 blocks
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3 years ago
A train car has a mass of 10,000 kg and is moving at +3.0 m/s. It strikes an identical train car that is at rest. The train cars
jolli1 [7]

Answer:1.5

Explanation:

Edg

7 0
3 years ago
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