Part A: We turn on a heater that delivers 150 watts (150 J/s) to 1.6 kg...
Part A:
We turn on a heater that delivers 150 watts (150 J/s) to 1.6 kg of water in a lab experiment. After 39 seconds, how much will the water temperature have increased? Give your answer in degrees Celsius.
Hint: The specific heat of water is 4186 J/kg °C.
Part B:
Suppose you have a closed rigid container of air at 20 Celsius on the surface of the Earth. We change the temperature of the container to 61 Celsius, leaving it closed, and read a pressure gauge attached to the container. Initially the reading was 101 KPa (kilopascals, or 1000 N/m2). What is the new reading? Give your answer in KPa.
Part C:
You have a spring about which you know little, but with experimenting you discover that it extends 1 cm when a mass 45.83 is applied to it. How far would it extend if a mass 66.47 were applied? Give your answer in meters, not cm.
Homework Answers
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Part A:
We turn on a heater that delivers 150 watts (150 J/s) to 1.6 kg...
8. A 1.00 kg piece of aluminum (specific heat = 902 J/kg*C) originally at 90 degrees...
8. A 1.00 kg piece of aluminum (specific heat = 902 J/kg*C) originally at 90 degrees Celsius is placed in a container of water (specific heat = 4184 J/kg*C) originally at 25 degrees Celsius. The final temperature of the system is 40 degrees Celsius. What is the mass of the water in the container? (report your answer in kilograms to 3 decimal places)
Help!!! Part A If a total of 5.55 x 10% J of heat is added to...
Help!!!
Part A If a total of 5.55 x 10% J of heat is added to a mass of 555 g of water which was originally at a temperature of 555°C (and noting that the specific heat of water is 4186 J/kg-K and that the latent heat of vaporization of water is 2.26 x 106 J/kg), then what is the mass of the water that remains (ie. the mass of the water that was not vaporized)? O 335 g 258...
Part A and Part B (13%) Problem 6: An unknown material, m = 0.41 kg, at...
Part A and Part B
(13%) Problem 6: An unknown material, m = 0.41 kg, at a temperature of T-96 degrees C is added to a Dewer (an insulated container) which contains m,-1.5 kg of water at T2 = 23 degrees C. Water has a specific heat of c,-4186 J/(kg·K). After the system comes to equilibrium the final temperature is T= 31.2 degrees C. 50% Part (a) Input an expression for the specific heat of the unknown material. 0 BACKSPACE...
(20%) Problem 2: A piece of unknown material has a mass of m, = 0.79 kg and an initial temperature of Tu = 79°C. The s...
(20%) Problem 2: A piece of unknown material has a mass of m, = 0.79 kg and an initial temperature of Tu = 79°C. The specific heat of water is cw = 4.180 x 102 J/(kg:°C). 50% Part (a) The sample of material is dropped into my = 1.4 kg of water at T = 19°C in a calorimeter. The calorimeter reaches a final temperature of Te = 34°C. Enter an expression for the specific heat of the unknown material,...
1. A pump steadily delivers 13.7 kg/s of water at the conditions given below. Calculate the...
1. A pump steadily delivers 13.7 kg/s of water at the conditions given below. Calculate the pump power (hp). There is no heat transfer from the pump to the surroundings (i.e., adiabatic conditions). Pump Inlet Temperature = 20oC Pump Inlet Pressure = 182 kPa Pump Inlet Diameter = 11.1 cm Pump Inlet Elevation = 20 m Pump Exit Temperature = 20oC Pump Exit Pressure = 601 kPa Pump Exit Diameter = 7.8 cm Pump Exit Elevation = 20 m Answer...
Initially you have mW = 3.4 kg of water at TW = 54°C in an insulated container. You add ice at TI = -21°C to the contain...
Initially you have mW = 3.4 kg of water at
TW = 54°C in an insulated container. You add
ice at TI = -21°C to the container and the mix
reaches a final, equilibrium temperature of Tf
= 25°C. The specific heats of ice and water are
cI = 2.10×103J/(kg⋅°C) and
cW = 4.19×103 J/(kg⋅°C),
respectively, and the latent heat of fusion for water is
Lf = 3.34×105 J/kg.
(11%) Problem 7: Initially you have mw = 3.4 kg of...
Refer to Figure 3 (below), depicting a regenerative Rankine cycle with a closed feedwater heater (CFWH) when considering the following system description. Saturated liquid water at a pressure of P b...
Refer to Figure 3 (below), depicting a regenerative Rankine cycle with a closed feedwater heater (CFWH) when considering the following system description. Saturated liquid water at a pressure of P before entering the CFWH. 12 kPa is pumped to a pressure of Pi-5 MPa After leaving the CFWH as a saturated liquid, the water continues to a Steam Generator which heats the water to a temperature of Ts 600°C. This superheated steam is used to drive a Turbine. A quantity...
(0%) Problem 4: Soda from a ms= 12 oz can at temperature Ts = 11.5°C is...
(0%) Problem 4: Soda from a ms= 12 oz can at temperature Ts = 11.5°C is poured in its entirely into a glass containing a mass m/= 0.19 kg amount of ice at temperature Ty=-18.5°C. Assume that ice and water have the following specific heats: c1=2090 J/(kg•°C) and cs = 4186 J/(kg:°C), and the latent heat of fusion of ice is Ir= 334 kJ/kg. In this problem you can assume that I kg of either soda or water corresponds to...
You drop an ice cube into an insulated container full of water and wait for the...
You drop an ice cube into an insulated container full of water and wait for the ice cube to completely melt. The ice cube initially has a mass of 80.0 g and a temperature of 0°C. The water (before the ice cube is added) has a mass of 660 g and an initial temperature of 20.0°C. What is the final temperature (in °C) of the mixture? (Assume no energy is lost to the walls of the container, or to the...
Elasticity, Hooke's Law, Periodic and Simple Harmonic Motion: A 1.6 kg mass is hung from a...
Elasticity, Hooke's Law, Periodic and Simple Harmonic Motion: A 1.6 kg mass is hung from a 25 cm long coiled spring. The the total surface area of the spring is 3.20 10-4 m? (Assume no friction or air resistance, and a "mass-less" spring) Part 1. If the spring stretches 16 cm when the mass is added, what is the Spring Constant (k)? Give your answer to 2 significant digits. kg/s2 Part 2. What is the Stress on the spring? Give...
Help!!!
Part A If a total of 5.55 x 10% J of heat is added to a mass of 555 g of water which was originally at a temperature of 555°C (and noting that the specific heat of water is 4186 J/kg-K and that the latent heat of vaporization of water is 2.26 x 106 J/kg), then what is the mass of the water that remains (ie. the mass of the water that was not vaporized)? O 335 g 258...
Part A and Part B
(13%) Problem 6: An unknown material, m = 0.41 kg, at a temperature of T-96 degrees C is added to a Dewer (an insulated container) which contains m,-1.5 kg of water at T2 = 23 degrees C. Water has a specific heat of c,-4186 J/(kg·K). After the system comes to equilibrium the final temperature is T= 31.2 degrees C. 50% Part (a) Input an expression for the specific heat of the unknown material. 0 BACKSPACE...
(20%) Problem 2: A piece of unknown material has a mass of m, = 0.79 kg and an initial temperature of Tu = 79°C. The specific heat of water is cw = 4.180 x 102 J/(kg:°C). 50% Part (a) The sample of material is dropped into my = 1.4 kg of water at T = 19°C in a calorimeter. The calorimeter reaches a final temperature of Te = 34°C. Enter an expression for the specific heat of the unknown material,...
Initially you have mW = 3.4 kg of water at
TW = 54°C in an insulated container. You add
ice at TI = -21°C to the container and the mix
reaches a final, equilibrium temperature of Tf
= 25°C. The specific heats of ice and water are
cI = 2.10×103J/(kg⋅°C) and
cW = 4.19×103 J/(kg⋅°C),
respectively, and the latent heat of fusion for water is
Lf = 3.34×105 J/kg.
(11%) Problem 7: Initially you have mw = 3.4 kg of...
Refer to Figure 3 (below), depicting a regenerative Rankine cycle with a closed feedwater heater (CFWH) when considering the following system description. Saturated liquid water at a pressure of P before entering the CFWH. 12 kPa is pumped to a pressure of Pi-5 MPa After leaving the CFWH as a saturated liquid, the water continues to a Steam Generator which heats the water to a temperature of Ts 600°C. This superheated steam is used to drive a Turbine. A quantity...
(0%) Problem 4: Soda from a ms= 12 oz can at temperature Ts = 11.5°C is poured in its entirely into a glass containing a mass m/= 0.19 kg amount of ice at temperature Ty=-18.5°C. Assume that ice and water have the following specific heats: c1=2090 J/(kg•°C) and cs = 4186 J/(kg:°C), and the latent heat of fusion of ice is Ir= 334 kJ/kg. In this problem you can assume that I kg of either soda or water corresponds to...
Elasticity, Hooke's Law, Periodic and Simple Harmonic Motion: A 1.6 kg mass is hung from a 25 cm long coiled spring. The the total surface area of the spring is 3.20 10-4 m? (Assume no friction or air resistance, and a "mass-less" spring) Part 1. If the spring stretches 16 cm when the mass is added, what is the Spring Constant (k)? Give your answer to 2 significant digits. kg/s2 Part 2. What is the Stress on the spring? Give...
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