1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
almond37 [142]
3 years ago
14

How much total heat transfer is necessary to lower the temperature of 0.175 kg of steam from 125.5 °C to −19.5 °C, including the

energy for phase changes? How much time is required for each stage of this process, assuming a constant 835.0 W rate of heat exchange? Give the times in the order that the stages occur.
Physics
1 answer:
GaryK [48]3 years ago
5 0

Answer:

Explanation:

The heat required to change the temperature of  steam from 125.5  °C to 100 °C is:

Q_1 = ms_{steam} (125.5^0C - 100^0C) \\ \\ Q_1 = 0.175 \ kg ( 1520 \ J/kg.K ) (25.5^0 \ C) \\ \\ Q_1 = 6783 \ J

The heat required to change the steam at 100°C to water at 100°C is;

Q_2 = mL_v \\ \\ Q_2 = (0.175 \ kg) (2.25*10^6 \ J/kg ) \\ \\ Q_2 = 393750 \ J

The heat required to change the temperature from 100°C to 0°C is

Q_3 = ms_{water} (100^) \ C) \\ \\ Q_3 = (0.175\ kg)(4186 \ J/kg.K) (100 ^0c ) \\ \\ Q_3 = 73255 \ J

The heat required to change the water at 0°C to ice at 0°C  is:

Q_4 = mL_f \\ \\ Q_4 = (0.175 \ kg)(3.34*10^5 \ J/kg) \\\\ Q_4 = 58450 \ J

The heat required to change the temperature of ice from 0°Cto -19.5°C is:

Q_5 = ms _{ice} (100^0 C) \\ \\ Q_5 = (0.175 \ kg)(2090 \ J/kg.K)(19.5^0C)  \\ \\ Q_5 = 7132.125 \ J

The total heat required to change the steam into ice is:

Q = Q_1 + Q_2 + Q_3 + Q_4 +Q_5 \\ \\Q = (6788+393750+73255+58450+7132.125)J \\ \\ Q = 539325.125 \ J \\ \\ Q = 5.39*10^5 \ J

b)

The time taken to convert steam from 125 °C to 100°C is:

t_1 = \frac{Q_1}{P} = \frac{6738 \ J}{835 \ W}  = 8.12 \ s

The time taken to convert steam at  100°C to water at  100°C is:

t_2 = \frac{Q_2}{P} =\frac{393750}{834} =471.56 \ s

The time taken to convert water to 100° C to 0° C is:

t_3 = \frac{Q_3}{P} =\frac{73255}{834} = 87.73 \ s

The time taken to convert water at 0° to ice at 0° C is :

t_4 = \frac{Q_4}{P} =\frac{58450}{834} = 70.08  \ s

The time taken to convert ice from 0° C to -19.5° C is:

t_5 = \frac{Q_5}{P} =\frac{7132.125}{834} = 8.55  \ s

You might be interested in
Describe a situation in which an electron will be affected by an external electric field but will not be affected by an external
irina [24]

Answer:

Explanation:

Situations in which an electron will be affected by an external electric field but will not be affected by an external magnetic field

a ) When an electron is stationary in the electric field and magnetic field , he will be affected by electric field but not by magnetic field. Magnetic field can exert force only on mobile charges.

b ) When the electron is moving parallel to electric field and magnetic field . In this case also electric field will  exert force on electron but magnetic field field will not exert force on electrons . Magnetic field can exert force only on the perpendicular component of the velocity of charged particles.

Situations when electron is affected by an external magnetic field but not by an external electric field

There is no such situation in which electric field will not affect an electron . It will always affect an electron .

6 0
3 years ago
The internal pressure on a bottle of soda is 5550 torr. the bottle cap is designed to withstand a pressure of 7.2 atm. (a) calcu
Mademuasel [1]

This is a conversion problem. 760 Torr is equal to 1 atmosphere. so we can can solve now. 5,550torr*(1atmosphere/760torr)=7.3atmospheres. since the two torrs cancel out with cross multiplication we are left in atmosphere units.

6 0
3 years ago
Read 2 more answers
When the velocity of an object is tripled, by what factor is its momentum changed ?
Pie

Answer:

also tripled, factor of 3

Explanation:

equation of momentum is p = m * v , where p=momentum, m=mass, and v=velocity

if m is unchanged

p1 = m1 *v1

p2 = m2 *v2

m1 = m2 and v2 = 3*v1

p2 = m1 * 3v1 = 3*p1, tripled momentum

3 0
2 years ago
What type of wall would make the best soundproof for room?
algol [13]
It depends, How big is the room. If it was me i would put "High density foam pads" all over the walls in the room, and that would get rid of some sound but put Drywall, or Plasterboard behind the foam pads. That should hopefully get rid of the sound from outside the room, and stop any noise in the background, if your using a mic, for example, a Youtube channel, or Twitch treaming channel. Hope this helps. BYE!! 
6 0
3 years ago
The level of toluene (a flammable hydrocarbon) in a storage tank may fluctuate between 10 and 400 cm from the top of the tank. S
Arturiano [62]

Answer:

A. 23.9

B.22.9

C. The levels will be equal

D. Obviously that will be to maintain atmospheric pressure

Explanation:

For mercury the pressure in both tubes at R is same so

P_left = P_right

Thus

=>>>Po + rho_t x g x (5 + R - 1.5) = Po + rho_ m x g x R

rho_t x g x (5 + R - 1.5) = rho_m x g xR

rho_t x (3.5 + R) = rho_m x R

3.5 + R = (rho_m/rho_t) x R

3.5 + R = (13560/867) x R

3.5 + R = 15.64 x R

R x (15.64 - 1) = 3.5

R = 3.5/14.64

= 0.239 m

= 23.9 cm  this is for Mercury

ii)water

similarly,

3.5 + R = (rho_w/rho_t) x R

3.5 + R = (1000/867) x R

3.5 + R = 1.153 x R

R X (1.153 - 1) = 3.5

R = 3.5/0.153

= 22.9m for water

7 0
3 years ago
Other questions:
  • Which title best reflects the main idea of the passage? The Role of Convection in the Distribution of Earth's Energy The Role of
    10·2 answers
  • A roller coaster car of mass 1420 kg slides on a frictionless track starting at a distance 36.83 m above the bottom of a loop 29
    9·2 answers
  • Which of the following concepts best explains why a mass of low-density material in the mantle rises?Multiple Choice Strain Buoy
    11·1 answer
  • In the effects of kinetic energy, the slower an object goes, the longer that it will take to bring that object to a stop.
    13·1 answer
  • A positively-charged object with a mass of 0.129 kg oscillates at the end of a spring, generating ELF (extremely low frequency)
    14·1 answer
  • Baseballs pitched by a machine have a horizontal velocity of 30 meters/second. The machine accelerates the baseball from 0 meter
    9·1 answer
  • Carol is farsighted ( presbyopia) and cannot see objects clearly that are closer to her eyes than about meter. She sees objects
    11·2 answers
  • Lisa sees the image below as she researches the behavior of light.
    12·2 answers
  • True or False: A chemical reaction always happens when two substances are combined. (please help fast this is a test)
    5·2 answers
  • Find the kenetic energy of a car of mass 700kg racing with a velocity of 10m/s
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!