Physics, 11.05.2021 21:50, deonharris18

Dibuja la gráfica de calentamiento de un kilogramo de plomo que se encuentra inicialmente a 70ºC y pasa a una temperatura final de 2000ºC, sabiendo que su temperatura de fusión es: 327.4ºC y la de ebullición es de 1725ºC

Answers: 2

Show answers

Answers

answered: goawayyounoob21

Q= m c_e ΔT and Q = m L

Explanation:

For this graph of temperature vs energy (heating) we must use two relations

* for when there is no change of state

Q= m c_e ΔT

* for using there is change of state

Q = m L

the second expression is a consequence of the fact that all the energy supplied is used to change the state of the solid-liquid and liquid-gas system

the energy supplied is the sum of the energy in each interval

divide the system into intervals determined by the state change points

1) from T₀ = 70ºC to T_f = 327.4ºC, sample in solid-liquid state

c_e = 128 J / kg ºC

Q₁ = m c_e (T_f -To)

Q₁=1 128 (327.4 -70)

Q₁ = 3.29 10⁴ J

Q = Q₁ = 3.29 10⁴ J

2) when is it changing from solid to liquid

L = 2.45 10⁴ J / kg

Q2 = 1 2.45 10⁴

Q2 = 2.45 10⁴ J

Q = Q₁ + Q₂

Q = 5.74 10⁴ J

3) from to = 327.4ºC until T_f = 1725ºC, sample in liquid state

in the tables the specific heat of the solid and liquid state is the same

Q3 = m c_e (T_f -To)

Q3 = 1 128 (1725 -327.4)

Q3 = 1.79 10⁵ J

Q = Q₁ + Q₂ + Q₃

Q = (3.29 +2.45 + 17.9) 10⁴ J

Q = 23.64 10⁴ J

4) for when it is changing from the liquid state to the gaseous state

L_v = 8.70 10⁵ J / kg

Q₄ = m L_v

Q₄ = 1 8.70 10⁵

Q₄ = 8.70 10⁵ J

Q = Q₁ + Q₂ + Q₃ + Q₄

Q = (3.29 +5.74 + 17.9+ 87.0) 10⁴ J

Q = 110.64 10⁴ J

5) from To = 1725ºC to T_f = 2000ºC, sample in gaseous state

Q₅ = m c_e ΔT

Q₅ = 1 128 (2000 -1725)

Q₅ = 3.52 10⁴ J

Q = Q₁ + Q₂ + Q₃ + Q₄ + Q₅

Q = 114.16 104 J

the following table shows the points to be plotted

Energy (10⁴ J) Temperature (ºC)

0 70

3.29 327.4

5.74 327.4

23.64 1725

110.64 1725

114.16 2000

In the attachment we can see a graph of Temperature versus energy supplied

answered: Guest

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

answered: Guest

v 154.9= 0.9 length length s little over 154.9cm

Other questions on the subject: Physics

Physics, 21.06.2019 16:00, aprilkenedy12

Your pendulum clock which advances 1.0 s for every complete oscillation of the pendulum is running perfectly on earth at a site where the magnitude of the acceleration due to gravity is 9.80 m/s2. you send the clock to a location on the moon where the magnitude of the acceleration due to gravity is 1.65 m/s2.

Answers: 2

continue

Physics, 21.06.2019 22:00, sophiamoser

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i. e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

Answers: 2

continue

Physics, 22.06.2019 10:00, squirrel6875

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

Answers: 1

continue

Physics, 22.06.2019 13:30, sukiyoshi10

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)

Answers: 1

continue

Do you know the correct answer?

Dibuja la gráfica de calentamiento de un kilogramo de plomo que se encuentra inicialmente a 70ºC y p...