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3 years ago

3. When are ionic compounds able to conduct electricity?

1 answer:

jeka943 years ago

7 0

Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.

hope it helps...!!!

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Which of the following charts correctly compares plant and animal cells?

nadya68 [22]

Answer:

Wheres the charts??

Explanation:

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3 years ago

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Why is the scientific method described as cyclic?

Troyanec [42]

Because the scientific method can go around in a circle as many times as neccisary to get the results you need

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3 years ago

A cylinder with rotational inertia I1=2.0kg·m2 rotates clockwise about a vertical axis through its center with angular speed ω1=

Mrac [35]

Answer:

a) 0.67 rad/sec in the clockwise direction.

b) 98.8% of the kinetic energy is lost.

Explanation:

Let us take clockwise angular speed as +ve

For first cylinder

rotational inertia $I$ = 2.0 kg-m^2

angular speed ω = +5.0 rad/s

For second cylinder

rotational inertia $I$ = 1.0 kg-m^2

angular speed = -8.0 rad/s

The rotational momentum of a rotating body is given as = $I$ ω

where $I$ is the rotational inertia

ω is the angular speed

The rotational momenta of the cylinders are:

for first cylinder = $I$ ω = 2.0 x 5.0 = 10 kg-m^2 rad/s

for second cylinder = $I$ ω = 1.0 x (-8.0) = -8 kg-m^2 rad/s

The total initial angular momentum of this system cylinders before they were coupled together = 10 + (-8) = 2 kg-m^2 rad/s

When they are coupled coupled together, their total rotational inertia $I_{t}$ = 1.0 + 2.0 = 3 kg-m^2

Their final angular rotational momentum after coupling = $I_{t}$ $w_{f}$

where $I_{t}$ is their total rotational inertia

$w_{f}$ = their final angular speed together

Final angular momentum = 3 x $w_{f}$ = 3 $w_{f}$

According to the conservation of angular momentum, the initial rotational momentum must be equal to the final rotational momentum

this means that

2 = 3 $w_{f}$

$w_{f}$ = final total angular speed of the coupled cylinders = 2/3 = 0.67 rad/s

From the first statement, the direction is clockwise

b) Rotational kinetic energy = $\frac{1}{2} Iw^{2}$

where $I$ is the rotational inertia

$w$ is the angular speed

The kinetic energy of the cylinders are:

for first cylinder = $\frac{1}{2} Iw^{2}$ = $\frac{1}{2}*2*5^{2}$ = 25 J

for second cylinder = $\frac{1}{2}*1*8^{2}$ = 32 J

Total initial energy of the system = 25 + 32 = 57 J

The final kinetic energy of the cylinders after coupling = $\frac{1}{2}I_{t}w^{2} _{f}$

where

where $I_{t}$ is the total rotational inertia of the cylinders

$w_{f}$ is final total angular speed of the coupled cylinders

Final kinetic energy = $\frac{1}{2}*3*0.67^{2}$ = 0.67 J

kinetic energy lost = 57 - 0.67 = 56.33 J

percentage = 56.33/57 x 100% = 98.8%

6 0

3 years ago

An object traveling in a circular path is accelerating because its

Anton [14]

It is accelerating because the direction of the velocity vector is changing

8 0

4 years ago

In a waterfall, water falls 60 m. Assume all the potential energy change increases its enthalpy (or internal energy, in this cas

iVinArrow [24]

Answer:

The temperature rise of the water is = 0.14 °c

Explanation:

Height = 60 m

Potential energy change ΔP = $m gh$

ΔP = m × 9.81 × 60

ΔP = (588.6 × m) Joule

Since the Potential energy change is equal to the internal energy change or Enthalpy change.

ΔP = ΔH

Since ΔH = m × C × ΔT

⇒ ΔP = m × C × ΔT

Put all the values in above formula we get

⇒ 588.6 × m = m × 4184 × ΔT

⇒ ΔT= 0.14 °c

Therefore the temperature rise of the water is = 0.14 °c

4 0

3 years ago