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4 years ago

Balancing Chemical Equations

Physics

2 answers:

finlep [7]4 years ago

8 0

1. 2 C2H6 + 7 O2 = 6 H2O + 4 CO2

hram777 [196]4 years ago

6 0

The answers are right, drag them towards the left.

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Current cannot flow through a circuit when the switch is _____.

Akimi4 [234]

Answer:

Open

Closed

Explanation:

An open circuit is an electrical circuit in which the electric current does not circulate because it is interrupted or not communicated by means of an electrical conductor. While in a closed circuit, the current, that is the flow of electrons, travels from the beginning of the circuit to the end.

4 0

3 years ago

Read 2 more answers

Squids and octopuses propel themselves by expelling water. They do this by keeping water in a cavity and then suddenly contracti

Goshia [24]

Answer:

6.78571 m/s

55.13387 Joules

Explanation:

$v_s$ = Velocity of squid = 2.5 m/s

$v_w$ = Velocity of water

$m_w$ = Mass of water = 1.75 kg

Mass of squid

$m_s=6.5-1.75=4.75\ kg$

Momentum of squid

$p_s=m_sv_s\\\Rightarrow p_s=4.75\times 2.5\\\Rightarrow p_s=11.875\ kgm/s$

As the momentum of the system is conserved

$p_s+p_w=0\\\Rightarrow p_s=-p_w\\\Rightarrow 11.875=-p_w\\\Rightarrow 11.875=-m_wv_w\\\Rightarrow v_w=-\frac{11.875}{1.75}\\\Rightarrow v_w=6.78571\ m/s$

The speed of the water is 6.78571 m/s

Kinetic energy the squid creates is given by

Kinetic energy of the squid + Kinetic energy of water

$K=K_s+K_w\\\Rightarrow K=\frac{1}{2}(m_sv_s^2+m_wv_w^2)\\\Rightarrow K=\frac{1}{2}(4.75\times 2.5^2+1.75\times 6.78571^2)\\\Rightarrow K=55.13387\ J$

Kinetic energy the squid creates by this maneuver is 55.13387 Joules

7 0

3 years ago

Consider light that has its third minimum at an angle of 23.3° when it falls on a single slit of width 4.05 μm. Find the wavelen

fredd [130]

Answer:

The wavelength of light is 533 nm.

Explanation:

It is given that,

Width of a single slit, $d=4.05\times 10^{-6}\ m$

Light has its third minimum at an angle of 23.3° when it falls on a single slit. For destructive interference, the equation for minima is given by:

$d\ sin\theta=n\lambda$

Here, n = 3

$\lambda=\dfrac{d\ sin\theta}{n}$

$\lambda=\dfrac{4.05\times 10^{-6}\times sin(23.3)}{3}$

$\lambda=5.33\times 10^{-7}\ m$

$\lambda=533\ nm$

So, the wavelength of the light is 533 nm. Hence, this is the required solution.

6 0

3 years ago

What kind of situation could possibly have caused less energy to enter the Earth's system than exited it, several billions of ye

Sever21 [200]

Answer:

Methane, which generally produces more heat and energy got decreased in the Earth's system, leading to less energy in the Earth system and less energy absorbed by Earth's surface.

Explanation:

Methane produces a great deal of energy than any other gas that plays a role in the greenhouse effect. In several billions of years ago, humans were not engaging in activities that could increase the amount of methane in the earth's system most especially the atmosphere. Such activities that were not done include burning fossil fuel, raising livestock as we have now, and waste disposal. Natural process which includes natural air reduces some amount of methane in the atmosphere.

7 0

3 years ago

A balloon is filled with 73 L of air at 1.3 atm pressure. What pressure is needed to change the volume to 43L?

Licemer1 [7]

Answer:

roughly 2.2 atm

Explanation:

using Boyle's law (P1V1=P2V2),

73×1.3=43×x

x= 2.21 or 2.2 atm

8 0

3 years ago