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gladu [14]
3 years ago
9

How much heat does it take to melt a 0.234 kg ice cube at its melting point?

Physics
1 answer:
Anarel [89]3 years ago
4 0

Answer:

77922J

Explanation:

Thermal Energy used

= Energy used to change state from solid to liquid

= <em>m</em><em>l</em><em>f</em><em> </em> [Formula of latent heat of fusion]

= <em>(</em><em>0</em><em>.</em><em>2</em><em>3</em><em>4</em><em>)</em><em>(</em><em>3</em><em>.</em><em>3</em><em>3</em><em> </em><em>×</em><em> </em><em>1</em><em>0</em><em>^</em><em>5</em><em>)</em>

= <u>7</u><u>7</u><u>9</u><u>2</u><u>2</u><u> </u><u>J</u>

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The concentration of a solution that contains 70g of H2SO4 in 0,28 dm³ of solution is?​
Simora [160]

Taking into account the definition of molarity, the concentration of a solution that contains 70 g of H₂SO₄ in 0,28 dm³ of solution is 2.5510 \frac{moles}{L}.

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

Molarity=\frac{number of moles}{volume}

Molarity is expressed in units \frac{moles}{L}.

<h3>This case</h3>

In this case, you have:

  • number of moles= 70 g×\frac{1 mole}{98 g}= 0.7143 moles, where 98 g/mole os the molar mass of H₂SO₄
  • volume= 0.28 dm³= 0.28 L (being 1 dm³= 1 L)

Replacing in the definition of molarity:

Molarity=\frac{0.7143 moles}{0.28 L}

Solving:

<u><em>Molarity= 2.5510 </em></u>\frac{moles}{L}

Finally, the concentration of a solution that contains 70 g of H₂SO₄ in 0,28 dm³ of solution is 2.5510 \frac{moles}{L}.

Learn more about molarity:

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4 0
2 years ago
Light can be transmitted through long fiber optic strands because of
wariber [46]
Total internal reflection. Although I'm not 100%


3 0
3 years ago
Read 2 more answers
The moment of inertia of the empty turntable is 1.5 kg?m2. With a constant torque of 2.5 N?m, the turntableperson system takes 3
Tamiku [17]

6.0 \mathrm{kg} \mathrm{m}^{2} is the persons moment of inertia about an axis through her center of mass.

Answer: Option B

<u>Explanation:</u>

Given data are as follows:

moment of inertia of the empty turntable = 1.5

Torque = 2.5 N/m , and

           \text { Angular acceleration of the turntable }=\frac{\text { angular speed }}{\text { time }}=\frac{1}{3}

Let the persons moment of inertia about an axis through her center of mass= I

So, Now, from the formula of torque,

            \text { Torque }(\tau)=\text { Moment of inertia(I) } \times \text { Angular acceleration(a) }

            2.5=(1.5+I) \times \frac{1}{3}

So, from the above equation, we can measure the person’s moment of Inertia (I)

             2.5 \times 3=1.5+I

             I=7.5-1.5=6.0 \mathrm{kg} m^{2}

8 0
3 years ago
An armadillo and Earth attract each other gravitationally. Which experiences the greater gravitational force, or do they experie
Taya2010 [7]

Answer:

a. Same force magnitude

6 0
3 years ago
You travel 20.0 mph for 0.500 hour, 40.0 mph for 1.00 hour, 30.0 mph for 0.500 hour, and 50.0 mph for 2.00 hours. What is the av
Karo-lina-s [1.5K]
The answer is 41.25 mph.

The average speed (v) can be expressed as:
v = D/T  
where
D is total distance: D = d1 + d2 + d3 + d4
T is total time: T = t1 + t2 + t3 + t4

Now let's calculate distances using the formula: d = v * t:
d1 = v1 * t1 = 20.0 * 0.500 = 10 mi
d2 = v2 * t2 = 40.0 * 1.00 = 40 mi
d3 = v3 * t3 = 30.0 * 0.500 = 15 mi
d4 = v4 * t4 = 50.0 * 2.00 = 100 mi

Thus, the average speed is:
v= \frac{D}{T}= \frac{d1 + d2 + d3 +d4}{t1+t2+t3+t4} = \frac{10+40+15+100}{0.500+1.00+0.500+2.00}= \frac{165}{4} = 41.25 mph
4 0
3 years ago
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