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mariarad [96]
4 years ago
15

NEED HELP PLZ IM FAILING. Combustion occurs when _____. oxidation reactions are very slow oxidation reactions are so fast the su

bstance catches fire oxygen is removed from another substance machines use chemical energy to do work
Physics
2 answers:
lukranit [14]4 years ago
7 0
Combustion<span> will </span>occur<span> when there is not enough oxygen to allow the fuel to react completely to produce carbon dioxide and water.. Hope this helps

</span>
tia_tia [17]4 years ago
3 0

Answer:Combustion occurs when oxidation reactions are so fast the substance catches fire

Explanation:Happy to help :)

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Which statement about real gases is true? A) Forces of attraction and repulsion exist between gas particles at close range. B) T
olga55 [171]

Answer: A) Forces of attraction and repulsion exist between gas particles at close range.

Explanation:

The <u>Ideal Gas equation</u> is:  

P.V=n.R.T  

Where:  

P is the pressure of the gas  

V is the volume of the gas  

n the number of moles of gas  

R is the gas constant  

T is the absolute temperature of the gas in Kelvin

According to this law, molecules in gaseous state do not exert any force among them (attraction or repulsion) and the volume of these molecules is small, therefore negligible in comparison with the volume of the container that contains them.  In this sense, real gases can behave approximately to an ideal gas, under conditions of high temperature and low pressures.

However, at low temperatures or high pressures, real gases deviate significantly from ideal gas behavior.  This is because at low temperatures molecules begin to move slower, allowing the repulsive and attractive forces among them to take effect. In fact, <u>the attraction forces are responsible for the condensation of the gas</u>. In addition, at  high pressures the volume of molecules cannot be approximated to zero, hence the volume of these molecules is not negligible anymore.

7 0
4 years ago
HI PLEASE HELP!
butalik [34]

Answer:

Chemical reactions occur slower at lower temperatures and faster at higher temperatures. When you put a glow stick in cold water, the chemical reaction slows down but will last for a longer period of time. When you put a glow stick in hot water, the reaction speeds up but will be over quicker.

Explanation:

(self-explanatory)

I hope this helps, have a nice day.

7 0
3 years ago
A particle moves along the x-axis with velocity given by v(t)=3t2+6t for time tâ¥0. If the particle at position x=2 at time t=0,
sergey [27]

Answer:

b) 6

Explanation:

Given

v(t)=3t²+6t

X(0) = 2

X(1) = ?

Knowing that

v(t)=3t²+6t = dX/dt

⇒ ∫dX = ∫(3t²+6t)dt

⇒ X - X₀ = t³ + 3t²

⇒ X(t) = X₀ + t³ + 3t²

If  X(0) = 2

⇒  X(0) = X₀ + (0)³ + 3(0)² = 2

⇒  X₀ = 2

then we have

X(t) = t³ + 3t² + 2

when

t = 1

X(1) = (1)³ + 3(1)² + 2

X(1) = 6

8 0
4 years ago
Read 2 more answers
Which wave property is directly related to energy
GrogVix [38]
The wave property is called frequency
5 0
3 years ago
Read 2 more answers
You are designing a ski jump ramp for the next Winter Olympics. You need to calculate the vertical height h from the starting ga
Evgen [1.6K]

Answer:

h = 40.37 m

Explanation:

We will apply the law of conservation of energy to the skier in this case, as follows:

Energy\ of\ skier\ at\ the\ gate = Energy\ of\ Skier\ at\ the\ end\\P.E + K.E_{i} = K.E_{f} - W_{friction}\\mgh + \frac{1}{2}mv_{i}^2 = \frac{1}{2}mv_{f}^2 - W_{friction}\\\\mgh = \frac{1}{2}m(v_{f}^2-v_{i}^2) - W_{friction}

where,

m = mass of skier = 77 kg

g = acceleration due to gravity = 9.81 m/s²

vf = final speed = 30 m/s

vi = initial speed = 2 m/s

W_friction = Work done by friction and air resistance = 4000 J

Therefore,

(77\ kg)(9.81\ m/s^2)h = \frac{1}{2}(77\ kg)[(30\ m/s)^2-(2\ m/s)^2] - 4000\ J\\\\h = \frac{34496\ J - 4000\ J}{755.37\ N}\\\\

<u>h = 40.37 m</u>

5 0
4 years ago
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