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Question 1 (1 point) Under which one of the following circumstances will heat transfer occur via...
1. Hot air rises - this causes upward heat transfer and is one of the most...
1. Hot air rises - this causes upward heat transfer and is one of the most familiar forms of convection. Why does air cool as it rises this way? 2. (H16.17) Since all objects emit energy to their surroundings, why don’t the temperatures of all objects continuously decrease? 3. (H16.25) Does Newton’s law of cooling apply to warming a well as to cooling? 4. (H17.4) Why is evaporation a cooling process? 5. (H17.19) When will water boil at a temperature...
ASSIGNMENT 1 BMM35131920/1 QUESTION 3 [10 Marks] a) Briefly discuss the following terms in heat transfer:...
ASSIGNMENT 1 BMM35131920/1 QUESTION 3 [10 Marks] a) Briefly discuss the following terms in heat transfer: i. Blackbody ii. Absorptivity iii. Convection iv. Specific heat v. Thermal conductivity (5 Marks) b) An industrial galvanized pipe (Figure Q3) that carries SiO2 nanofluid as cooling liquid passes through a factory in which the air is at 27°C. The outside diameter of the pipe is 75 mm, and its surface temperature and emissivity are 200 °C and 0.8, respectively. If the coefficient associated...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there may be other modes of heat transfer present (e.g. radiation or conduction), but ignore those effects. For example, a hot ball bearing being dropped from a building roof. Ans. Forced, external convection over a sphere. a. Water flow through a fire hose from a hydrant. b. Heat transfer from a clothes iron sitting on an ironing board. c. Heat transfer from a climber trapped...
Question 26 (1 point) Under which of the following scenarios will deadweight loss occur? A) The...
Question 26 (1 point) Under which of the following scenarios will deadweight loss occur? A) The actual quantity prevailing in the market is the equilibrium quantity. B) The actual price prevailing in the market is the equilibrium price. OC) The market clears. D) The actual price prevailing in the market is lower than the equilibrium price. Question 27 (1 point) Once diminishing returns to labor occurs, it causes which of the following phenomena? A) Decreasing returns to scale. B) Increasing...
1) According to Einstein's theory of general Relativity, The Earth orbits around the sun because A)...
1) According to Einstein's theory of general Relativity, The Earth orbits around the sun because A) The gravitational force emanating from the Sun causes the Earth to accelerate away from a straight line path and curve towards the Sun b) The structure of space-time in the region of the Earth has been altered by the presence of the Sun in such a way that its orbit, although curved, is the shortest path in space-time. c) The particles having mass in...
Question 1 (1 point) Solids, liquids and gaseous phases of matter may interact by van der Waals forces, which are...
Question 1 (1 point) Solids, liquids and gaseous phases of matter may interact by van der Waals forces, which are weak electrostatic intermolecular bonds that form between neutral molecules. True False Question 2 (1 point) Hydrogen bonding is the only type of van der Waals force exhibited in the water molecule. True False Question 3 (1 point) Solids may be classified as crystalline or amorphous. True False Question 4 (1 point) Solid to liquid phase is known as sublimation. aaPM...
1. What effects can heat transfer have on H2O, if no chemical reactions occur? a) At...
1. What effects can heat transfer have on H2O, if no
chemical reactions occur?
a) At 0°C, the
temperature of the water in an ice-water mix may increase, or the
temperature of the ice in the ice-water mix may decrease.
b) Either the
temperature of the water will change or the phase will change, but
not both at the same time.
c) At 0°C, ice will
expand as it turns into liquid water.
d) None of the
above.
2. Which...
Question 1 5 pts - What is the purpose of melting point? All the answers To...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Question 1 5 pts - What is the purpose of melting point? All the answers To...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Question 1: (Total 25 marks. Each question is worth 5 marks each) For each of the...
Question 1: (Total 25 marks. Each question is worth 5 marks each) For each of the statements below, indicate whether the statement is true or false and explain your reasoning A. Object A with a net charge of +5C is placed 1 cm away from Object B with a net charge of +8C. When Object A is moved a further 2 cm away from Object B, the size of the force between the two objects will increase. B. Two balloons...
ASSIGNMENT 1 BMM35131920/1 QUESTION 3 [10 Marks] a) Briefly discuss the following terms in heat transfer: i. Blackbody ii. Absorptivity iii. Convection iv. Specific heat v. Thermal conductivity (5 Marks) b) An industrial galvanized pipe (Figure Q3) that carries SiO2 nanofluid as cooling liquid passes through a factory in which the air is at 27°C. The outside diameter of the pipe is 75 mm, and its surface temperature and emissivity are 200 °C and 0.8, respectively. If the coefficient associated...
Question 1: Identify the classification of the following heat transfer (convective flow) problems: *Note that there may be other modes of heat transfer present (e.g. radiation or conduction), but ignore those effects. For example, a hot ball bearing being dropped from a building roof. Ans. Forced, external convection over a sphere. a. Water flow through a fire hose from a hydrant. b. Heat transfer from a clothes iron sitting on an ironing board. c. Heat transfer from a climber trapped...
Question 26 (1 point) Under which of the following scenarios will deadweight loss occur? A) The actual quantity prevailing in the market is the equilibrium quantity. B) The actual price prevailing in the market is the equilibrium price. OC) The market clears. D) The actual price prevailing in the market is lower than the equilibrium price. Question 27 (1 point) Once diminishing returns to labor occurs, it causes which of the following phenomena? A) Decreasing returns to scale. B) Increasing...
Question 1 (1 point) Solids, liquids and gaseous phases of matter may interact by van der Waals forces, which are weak electrostatic intermolecular bonds that form between neutral molecules. True False Question 2 (1 point) Hydrogen bonding is the only type of van der Waals force exhibited in the water molecule. True False Question 3 (1 point) Solids may be classified as crystalline or amorphous. True False Question 4 (1 point) Solid to liquid phase is known as sublimation. aaPM...
1. What effects can heat transfer have on H2O, if no
chemical reactions occur?
a) At 0°C, the
temperature of the water in an ice-water mix may increase, or the
temperature of the ice in the ice-water mix may decrease.
b) Either the
temperature of the water will change or the phase will change, but
not both at the same time.
c) At 0°C, ice will
expand as it turns into liquid water.
d) None of the
above.
2. Which...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Question 1: (Total 25 marks. Each question is worth 5 marks each) For each of the statements below, indicate whether the statement is true or false and explain your reasoning A. Object A with a net charge of +5C is placed 1 cm away from Object B with a net charge of +8C. When Object A is moved a further 2 cm away from Object B, the size of the force between the two objects will increase. B. Two balloons...
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