Question

In: Physics

. Inside of a calorimeter (insulated container) is placed 200g of water at 20°C. The lid...

. Inside of a calorimeter (insulated container) is placed 200g of water at 20°C. The lid of the calorimeter is briefly lifted and 50g of lead is added initially at 200°C. What is the thermal equilibrium temperature? (3pts)

10. An object of mass 50kg is pushed in the +x direction with a force of 40N flat along a horizontal surface causing a net acceleration of 0.15m/s2 in the +x direction. What is the coefficient of kinetic friction between the surface and the object?

Solutions

Expert Solution

Suppose the final temperature is T.

Now Using energy conservation:

Heat gained by 0.200 kg water = Heat released by 0.050 kg lead

Q1 = Q2

m1*C1*dT1 = m2*C2*dT2

dT1 = Tf - Ti = T - 20

dT2 = 200 - T

m1 = mass of water = 200 gm = 0.200 kg

m2 = mass of lead = 50 gm = 0.050 kg

C1 = Specific heat capacity of water = 4186 J/kg.C

C2 = Specific heat capacity of lead = 128 J/kg.C

m1*C1*dT1 = m2*C2*dT2

0.200*4186*(T - 20) = 0.050*128*(200 - T)

T = (0.050*128*200 + 0.200*4186*20)/(0.200*4186 + 0.050*128)

T = 21.36 C = final thermal equilibrium temperature

Part B.

Using Force balance in horizontal direction:

Fx_net = F_app - Ff

m*a = F_app - *m*g

= (F_app - m*a)/(m*g)

Using given values:

= (40 - 50*0.15)/(50*9.81)

= Coefficient of kinetic friction = 0.066


Related Solutions

A cup of hot coffee is placed inside a large, well-insulated container. Over a five minute...
A cup of hot coffee is placed inside a large, well-insulated container. Over a five minute period, the entropy of the cup decreases by 100 J/K. What can you say about the entropy of the air surrounding the cup?
An insulated container contains a gas with some initial conditions. A lid is opened which allows the gas to pass into another insulated container which was initially empty.
An insulated container contains a gas with some initial conditions. A lid is opened which allows the gas to pass into another insulated container which was initially empty. The mass of the gas remains constant. A process is described as reversible if there is no change in entropy. Explain in detail if this process is reversible or not.
A container contains water at 100 kPa. The specific volume of the water inside the container...
A container contains water at 100 kPa. The specific volume of the water inside the container is 1.00 m3/kg. What is the quality (x) of the water in the container, as a percentage and what is the phase of the water in the container?
A rigid, sealed container of R134a initially at -30°C and 40% quality is placed inside a...
A rigid, sealed container of R134a initially at -30°C and 40% quality is placed inside a room so that it heats up at 5°C/hr. If there is 3 kg of R134a in the container, determine: a) The volume of the container answer must be 0.2723 m3 b) The specific volume of the vapour when the R134a finishes converting into a gas answer must be 0.09075 m3/kg c) The pressure when all the R134a has finished converting into a gas answer...
20 liters of water at 20 bar and 100 °C are in a variable volume container....
20 liters of water at 20 bar and 100 °C are in a variable volume container. 56,000 kJ of heat are added to the system at constant pressure which causes an increase in both temperature and volume. Draw a schematic of the process Write the energy balance for this process and clearly state any assumptions: What is the final volume of the container? How much work in [kJ] is completed? Pay careful attention to your negative signs! In one sentence...
It is observed that 56.00 mL of water at 20∘C completely fills a container to the...
It is observed that 56.00 mL of water at 20∘C completely fills a container to the brim. When the container and the water are heated to 60∘C, 0.35 g of water is lost. Part A What is the coefficient of volume expansion of the container? Density of water at 60 ∘C is 0.98324 g/mL. Express your answer using two significant figures. Part B What is the most likely material of the container? copper aluminum glass iron
Two Film Cannisters are filled with water. These will be used in Calorimeter. One container will...
Two Film Cannisters are filled with water. These will be used in Calorimeter. One container will be used for heated pennies and the other for heated nickels. The pennies and nickels will be heated to a temp of 66 C. The cannister that will have pennies dropped into it, has a temperature of 20.1 C and a mass of 15.57g. The cannister that will have nickels dropped into it, has a temperature of 19.7 C and a mass of 17,33g....
A beaker of water at 80 degrees celsius is placed in the center of a well-insulated...
A beaker of water at 80 degrees celsius is placed in the center of a well-insulated room whose air temperature is 20 degrees celsius. Is the final temperature of the water: A) 20 degrees celsius B) Slightly above 20 degrees celsius C)  50 degrees celsius D) Slightly below 80 degrees celsius E)  80 degrees celsius
50.0 grams of cold water is placed in a styrofoam calorimeter and the initial temperature of...
50.0 grams of cold water is placed in a styrofoam calorimeter and the initial temperature of this water is 22.0 C. then 50.0 grams of warm water, initially at 40.0 C, is added to the cold water and the final temperature of the mixture is 30.6 C. Calculate: a) heat absorbed by cold water; heat lost by warm water, anc c) heat capacity of calorimeter
When 630. mg of a compund are dissolved in 6.00 mL water inside a calorimeter the...
When 630. mg of a compund are dissolved in 6.00 mL water inside a calorimeter the temperature increased from 19.0 ̊C to 23.0 ̊C. If the total number of Joules produced by this reaction was 202 Joules calculate the heat capacity of this calorimeter. Specific heat capacity of water = 4.184 J/g ̊C Density of water = 1.00 g/mL Please show work
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT