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Physics Intro Heat/Thermodynamics Test (14 marks, 20 minutes) You must complete or attempt all questions. 1....
Heat is added to a 1 kg piece of ice at a rate of 730 kW....
Heat is added to a 1 kg piece of ice at a rate of 730 kW. How long will it take for the ice to melt if it was initially at 0.00°C? (The latent heat of fusion for water is 334 kJ/kg and its latent heat of vaporization is 2260 kJ/kg.) Answer in two decimal places.
On a summer day, the air temperature is 36°C and the relative humidity is 20%. Water...
On a summer day, the air temperature is 36°C and the relative humidity is 20%. Water evaporates from the surface of a lake at a rate of 0.20 kg/h per square metre of water surface area. The temperature of water is 25°C. (a) Determine the mass transfer coefficient. (10 marks) (b) Determine the convective heat transfer coefficient. (10 marks) (c) Determine the net heat loss (in W/m2) from the lake. (5 marks) The specific volume of water vapour at 25°C...
please answer all questions Temperature Change and Phase Change - Specific Heat and Latent Heat -...
please answer all questions
Temperature Change and Phase Change - Specific Heat and Latent Heat - From COLD ICE to Warm Water The quantitative relationship between heat transfer and temperature change is Q = mcAT, where Q is heat transfer, m is the mass of the substance, and AT is the change in temperature. The symbol c stands for specific heat which depends on the material and phase (for exmample, water and ice have different specific heat). The specific heat...
please show the steps for A and B and C A Heat is added to a...
please show the steps for A and B and C
A Heat is added to a pure substance in a closed container at a constant rate. The figure shows a graph of the temperature of the substance as a function of time. If Lf - latent heat of fusion and Ly - latent heat of vaporization, what is the value of the ratio Ly/L for this substance? Temp. A) 5.0 B) 4.5 Time C) 1.5 D) 3.5 E) 7.2 B...
1.A metal smith pours 3.5 kg of lead shot at 93.0oC into 1.6 kg of water...
1.A metal smith pours 3.5 kg of lead shot at 93.0oC into 1.6 kg of water at 28.0oC in an isolated container. What is the final temperature of the mixture? Give your answer to one decimal place in units of oC. Cwater = 4.19 kJ/(kg*K), Clead = 0.129 kJ/(kg*K) 2. If heat is added to a material, the temperature must increase. True False 3. Cwater = 4.19 kJ/(kg*K) Cice = 2.06 kJ/(kg*K), Lfusion=334 kJ/kg Lvaporization=2260 kJ/kg How much heat (in...
a. the sensible heat ratio (SHR) for the cooling and dehumidifying process; (2 Marks) b. the...
a. the sensible heat ratio (SHR) for the cooling and
dehumidifying process; (2 Marks) b. the supply air volume flow rate
to the office in m3 /s; (5 Marks) c. the air dry bulb temperature
and specific enthalpy of the mixture of outdoor and recirculating
air; (4 Marks) d. the cooling coil’s load in kW. (5 Marks) e. the
apparatus dew point during the cooling and dehumidifying process;
and (4 Marks) f. Discuss, with reasons, the possible effects on the...
The second pic is the experiment result. Experiment 1 Determine the Latent heat of fusion for...
The second pic is the experiment result.
Experiment 1 Determine the Latent heat of fusion for ice LU kg) to 3 significant figures using calorimetry and the table below. Note that the shaded cell should be evaluated using your data LAST Equation and then value value value (10s//kg) 2. mice = mwater Equation 1: Construct the conservation of energy equation for heat Q m c ar n c (Trnal-Tinitial) Adding heat to an object can raise its temperature: Adding heat...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value Property 4.506 gcm-3 Density 47.9 g mol-I M Molar mass 8,6 x 10- K- 25.6 21.9 Coefficient of thermal expansion Molar heat capacity Thermal conductivity J mol- K- Wm- K- C k A titanium disc, which has a radius of exactly 10cm and thickness of exactly 5 mm at -20 °C, has a hole of radius exactly 1 cm drilled out of its centre....
CHAPTER 9 REVIEW QUESTIONS 1. How much heat is required to raise the temperature of a...
CHAPTER 9 REVIEW QUESTIONS 1. How much heat is required to raise the temperature of a 0.04 kg stainless steel spoon from 20°C to 50°C if the specific heat of stainless steel is 0.50 kJ/kg-C? (A) 200 (B) 400 (C) 600 (D) 800) (E) 1000 5. An ideal gas is confined to a container whose volume is fixed. If the container holds n moles of gas, by what factor will the pressure increase if the absolute temperature is increased by...
CHAPTER 9 REVIEW QUESTIONS 1. How much heat is required to raise the temperature of a...
CHAPTER 9 REVIEW QUESTIONS 1. How much heat is required to raise the temperature of a 0.04 kg stainless steel spoon from 20°C to 50°C if the specific heat of stainless steel is 0.50 kJ/kg-C? (A) 200 (B) 400 (C) 600 (D) 800) (E) 2000 5. An ideal gas is confined to a container whose volume is fixed. If the container holds n moles of gas, by what factor will the pressure increase if the absolute temperature is increased by...
please answer all questions
Temperature Change and Phase Change - Specific Heat and Latent Heat - From COLD ICE to Warm Water The quantitative relationship between heat transfer and temperature change is Q = mcAT, where Q is heat transfer, m is the mass of the substance, and AT is the change in temperature. The symbol c stands for specific heat which depends on the material and phase (for exmample, water and ice have different specific heat). The specific heat...
please show the steps for A and B and C
A Heat is added to a pure substance in a closed container at a constant rate. The figure shows a graph of the temperature of the substance as a function of time. If Lf - latent heat of fusion and Ly - latent heat of vaporization, what is the value of the ratio Ly/L for this substance? Temp. A) 5.0 B) 4.5 Time C) 1.5 D) 3.5 E) 7.2 B...
a. the sensible heat ratio (SHR) for the cooling and
dehumidifying process; (2 Marks) b. the supply air volume flow rate
to the office in m3 /s; (5 Marks) c. the air dry bulb temperature
and specific enthalpy of the mixture of outdoor and recirculating
air; (4 Marks) d. the cooling coil’s load in kW. (5 Marks) e. the
apparatus dew point during the cooling and dehumidifying process;
and (4 Marks) f. Discuss, with reasons, the possible effects on the...
The second pic is the experiment result.
Experiment 1 Determine the Latent heat of fusion for ice LU kg) to 3 significant figures using calorimetry and the table below. Note that the shaded cell should be evaluated using your data LAST Equation and then value value value (10s//kg) 2. mice = mwater Equation 1: Construct the conservation of energy equation for heat Q m c ar n c (Trnal-Tinitial) Adding heat to an object can raise its temperature: Adding heat...
Question 11 The following properties of titanium (Ti) are relevant to this question. Units Symbol Value Property 4.506 gcm-3 Density 47.9 g mol-I M Molar mass 8,6 x 10- K- 25.6 21.9 Coefficient of thermal expansion Molar heat capacity Thermal conductivity J mol- K- Wm- K- C k A titanium disc, which has a radius of exactly 10cm and thickness of exactly 5 mm at -20 °C, has a hole of radius exactly 1 cm drilled out of its centre....
CHAPTER 9 REVIEW QUESTIONS 1. How much heat is required to raise the temperature of a 0.04 kg stainless steel spoon from 20°C to 50°C if the specific heat of stainless steel is 0.50 kJ/kg-C? (A) 200 (B) 400 (C) 600 (D) 800) (E) 1000 5. An ideal gas is confined to a container whose volume is fixed. If the container holds n moles of gas, by what factor will the pressure increase if the absolute temperature is increased by...
CHAPTER 9 REVIEW QUESTIONS 1. How much heat is required to raise the temperature of a 0.04 kg stainless steel spoon from 20°C to 50°C if the specific heat of stainless steel is 0.50 kJ/kg-C? (A) 200 (B) 400 (C) 600 (D) 800) (E) 2000 5. An ideal gas is confined to a container whose volume is fixed. If the container holds n moles of gas, by what factor will the pressure increase if the absolute temperature is increased by...
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