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(II) An iron boiler of mass 180 $\mathrm{kg}$ contains 730 $\mathrm{kg}$ of waterat $18^{\circ} \mathrm{C} .$ A heater supplies energy at the rate of $52,000 \mathrm{kJ} / \mathrm{h}$ .How long does it take for the water $(a)$ to reach the boilingpoint, and $(b)$ to all have changed to steam?

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a. 4.9$h$b. $37 \mathrm{h}$

Physics 101 Mechanics

Chapter 19

Heat and the First Law of Thermodynamics

Kinetic Energy

Potential Energy

Energy Conservation

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

The Second Law of Thermodynamics

Hope College

University of Sheffield

University of Winnipeg

McMaster University

Lectures

03:23

In physics, mechanical energy is the sum of the kinetic and potential energies of a system.

03:47

In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

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(II) An iron boiler of mas…

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A 100 -W heater is used to…

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So we have a night and boiler 1 80 kilograms on Walker. Inside it off. So in 30 kilograms on their initially at 18 degrees Celsius for part lt problem, Want to find out given that the power generated by the boiler is 52,000 killer jewels for our how long will it take for the water tow reach boiling temperature which is 100. Research is off course when the water reaches under the recent Yes, the boiler also reaches under the recent years As long as you remember that you'll be fine So obviously he is m c d l daddy. Everything's in this case for for the water to reach that temperature, we have massive water 7 30 kilograms I'm C for water is 4186 Jule per kilogram Decree Celcius Bless for the iron the masses 1 80 kilograms. I am the special kid off Iran is for 50 jewels for kilogram. Bigby says Yes, time still dirty on our delta is 100 Myers 1 18 degrees which is 80. To link the sense Yes, Notice that our unit scandal off very well, which gives us the amount of energy needed which is Let's say this is some cute No, this is energy. We know that power is energy by time, which means time. Use energy by power. So to find find the amount off. I'm taking two produce this much energy. We simply take this energy hell And you waited by our power, which is 52,000. Hello, June. Just 50 doing do 52,000 which is 52,000 52 to 10 part three times killer jewels. So another 10 party if they doing to 10 past six. I was substituting this into ah calculator. We can see that this comes out too. Did you notice that the units are jewels are and here they start you. So are you currently being hard? Not image for seconds. It's a unit. So this comes out to be almost 4.946 hours. But because we have numbers only upto who is significant digits here? We raided us 4.9 cars. No, for Barbie. We want we want to the water to evaporate. So let's say the water is already 800 in recent years. No. Do you want to supply the latest hit off weaponization? So that the water will evaporate. So the eminent off heat needed for weaponization is simply mass times. They don't heat off position off water. Now, obviously, this is a will to power times time as usual. Like last time, energy is equal to power times, time excuses. The amount of time needed is mass times like latent heat off weatherization divided by power. Our master is 7 30 kilograms off water. The latent heat off weatherization of water is to 22.6 into 10 past six. After 10 part file jewel per kilogram. You can look this up in the book divided by our cover like we saw previously is 50 doing to tend bar six. Julie, where are No? It is that our units cancel out giving us ours. So this number is also in hearts and it turns out to be 31.7 to 7 hours. But this is the amount of time needed toe boy boil off the water after it has reached 100 reasons. Yes. So the total time is the amount of time needed to bring it to boil, which is 449444946 less the owned off time needed to borrow it off, which is 31 one so into still in, which starts up Toby for the 6.673 Hearts, which is 37 cars.

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