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
Nina [5.8K]
3 years ago
11

One end of a uniform well-lagged metal bar of length 0.80 m and cross-sectional area of

Physics
1 answer:
Neko [114]3 years ago
5 0

Complete question is;

One end of a uniform well-lagged metal bar of length 0.80 m and cross-sectional area of 4.0 x 10-3m2 is kept in steam at 100 ˚C while the other end is in melting ice in a well-lagged container. The ice melts at a steady rate of 5.5 x 10- 4 kgs-1 and the thermal conductivity of the material of the bar is 401 Wm-1K-1. Calculate the specific latent heat of fusion of ice

Answer:

Specific Latent heat of fusion;

L_f = 13.6 × 10^(5) J/kg

Explanation:

We are given;

Length of bar; L = 0.8 m

Area;A = 4 × 10^(-3) m²

Temperature;ΔT= 100°C = 100 + 273 = 373 K

Rate of melting;m/t = 5.5 × 10^(-4) kg/s

Thermal conductivity;k = 401 W/m·K

Latent heat of fusion has a formula;

ΔQ/Δt = (m/t)•L_f

So, L_f = (ΔQ/Δt)/(m/t) - - - (1)

We also know that ;

ΔQ/Δt = (ΔT × k × A)/L

Plugging in the relevant values, we have;

ΔQ/Δt = (373 × 401 × 4 × 10^(-3))/0.8

ΔQ/Δt = 747.865 J/S

Plugging this value for ΔQ/Δt in equation 1 gives;

L_f = 747.865/(5.5 × 10^(-4))

L_f = 13.6 × 10^(5) J/kg

You might be interested in
Winds are turned to the left in the Southern Hemisphere.<br><br> true or false
Nutka1998 [239]

Answer:

true

Explanation:

The force, called the "Coriolis effect," causes the direction of winds and ocean currents to be deflected. In the Northern Hemisphere, wind and currents are deflected toward the right, in the Southern Hemisphere they are deflected to the left.

4 0
3 years ago
a 1811kg car speeds up from rest when a traffic light turns green until it reaches a speed of 23m/s. how much work was done on t
sattari [20]

Answer:

The work done by the frictional force, W = 612565.32 J

Explanation:

Given data,

The mass of the car, m = 1811 kg

The initial velocity of the car, u = 0 m/s

The final velocity of the car, v = 23 m/s

Let the time period of the car be, t = 3 s

The acceleration of the car,

                              a = (v-u) /t

                                 = (23 - 0)/ 3

                                = 7.67 m/s²

The normal force acting on the car,

                         F = mg

                             = 1811 kg x 9.8 m/s²

                              = 17747.8 N

The displacement of the car,

                             s = ut + ½ at²

                                 = 0 + ½ x 7.67 x 3²

                                 = 54.52 m

The work done by the frictional force,

                              W = F · S

                              W = 17747.8 N x 54.52 m

                                   = 612565.32 J

Hence, the work done by the frictional force, W = 612565.32 J

3 0
3 years ago
The law of conservation of momentum states that __________.
dmitriy555 [2]

Answer:

The law of conservation of momentum states that, in the absence of an external force, the momentum of a system remains unchanged.

Explanation:

3 0
2 years ago
¿Qué tiempo realiza un avión de la Cd. de México a Cancún, si la distancia entre ambos es de 1608.9Km y el avión viaja a una rap
Leya [2.2K]
I can help you with that if you translate to English
3 0
3 years ago
When is a zero not significant?
maria [59]

Answer:

Not between significant digits.

Explanation:

A zero not significant when it's not between significant digits.

8 0
3 years ago
Read 2 more answers
Other questions:
  • In 6 days, the temperature dropped 18 degrees. How many degrees per day did the temperature drop?
    10·1 answer
  • describe a process in which energy changes forms at least twice. are there any unwanted forms of energy that are produced during
    15·1 answer
  • If an object has a kinetic energy of 30 j and mass of 34kg how fast is the object moving ?
    8·1 answer
  • What weather condition creates a tornado?
    15·1 answer
  • A car moving at a speed of 20m/s has a kinetic energy of 300,000 J. What is the car’s mass?
    8·1 answer
  • Calcalculate potential energy given to a potato sack having a mass of 2 kg as I raise it to a height of 450 CM ​
    6·1 answer
  • 7. What is the kinetic energy of a 3-kilogram ball that is rolling at 2 meters per second?
    12·1 answer
  • What causes an electromagnet to create a magnetic field?
    15·1 answer
  • A rock on earth has a weight of 135 Newtons. What is its mass?
    8·1 answer
  • A 21 KG chair initially at rest on a horizontal floor requires a 167 N horizontal force to set it in motion once the chair is in
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!