Specific and Latent Heat (Week 9)

Thursday, 3 May 2018

1:32 AM

Untitled picture.png Machine generated alternative text: Question Correct Marked out of 2.00 Flag question During the experiment you measure the amount of energy added to the calorimeter. You will do this by calculating the electrical power, P dissipated by a resistor. If one multimeter says that the current through the resistor is 1.4 A and the other multimeter tells you that the voltage drop across the resistor is 1.5 Volts. The temperature at this time is 24.00 C. What is the power dissipated by the resistor in Watts, W? 2.1 w Untitled picture.png Machine generated alternative text: Question 2 Correct Marked out of 1.00 Flag question Copper has a specific heat of 390 Jkg-lK-l. How much heat energy needs to be added to increase the temperature of a 4.3 g copper sphere from 38.00C to 66.70C? 48 Untitled picture.png Machine generated alternative text: Question 3 Correct Marked out of 2.00 Flag question During the experiment you will need to calculate the value of the specific heat of water, cw. In order to do this you will need to make use of the formula (P = power): (m AlcAi+mwc )dT dt Given the following data use the formula to calculate cw Note: this is data collected in an experiment, it may not give you the accepted value for cw. dT/dt = 0.075 Ks- CAF 900 Jkg-lK-l (correct to 3 significant figures) mw = 189 g mm = 2.6 g V = 9.1 V across heating element I = 8.2 A through heating element duration of experiment = 60.0s 5300 Jkg-l K-1       
Untitled picture.png Machine generated alternative text: Question 3 Correct Marked out of 2.00 Flag question During the experiment you will need to calculate the value of the specific heat of water, cw. In order to do this you will need to make use of the formula (P = power): (m AlcAi+mwc )dT dt Given the following data use the formula to calculate cw Note: this is data collected in an experiment, it may not give you the accepted value for cw. dT/dt = 0.075 Ks- CAF 900 Jkg-lK-l (correct to 3 significant figures) mw = 189 g mm = 2.6 g V = 9.1 V across heating element I = 8.2 A through heating element duration of experiment = 60.0s 5300 Jkg-l K-1 Untitled picture.png Machine generated alternative text: 4 Question Correct Marked out of 1.00 Flag question During this experiment you are going to need to set up a circuit. You will need to measure the current and voltage flowing through the resistor which is immersed in water. On the diagram below indicate where you would place the ammeter and voltmeter to measure the current and voltage through the resisting coil by dragging and dropping them onto the image.
Untitled picture.png Machine generated alternative text: 4 Question Correct Marked out of 1.00 Flag question During this experiment you are going to need to set up a circuit. You will need to measure the current and voltage flowing through the resistor which is immersed in water. On the diagram below indicate where you would place the ammeter and voltmeter to measure the current and voltage through the resisting coil by dragging and dropping them onto the image. Untitled picture.png Machine generated alternative text: 5 Question Correct Marked out of 1.00 Flag question 6 Question Correct Marked out of 1.00 Flag question During the experiment you will need to calculate the uncertainty in cw. In order to do this you will need to measure cw three times. If you record the values below for cw: Specific Heat of water (Jkg-l K-l) 4094 4066 4051 What would you give as the value of cw? 4070 Jkg-lK-l What is the uncertainty in your value of cw? 22 Jkg-lK-l Untitled picture.png Machine generated alternative text: 7 Question Incorrect Mark 0.00 out of 200 Flag question During the experiment you will measure the latent heat of fusion of ice I-i. You will add ice to an aluminium can filled with water and record the initial and final temperature of the water. All the data listed below is given to three significant figures. The following data is recorded: initial temperature: 64.6 oc final temperature: 35.0 oc mass of aluminium can: 33.8 g mass of can filled with water: 182 g mass of can filled with water and ice: 231 g time taken for ice to melt: 55.0 s specific heat of Al: 900 Jkg-lK-l (this is given to 3 significant figures) specific heat of water: 4180 Jkg-l K- Calculate Li in Jkg- Note: This is simulated data. The answer may not be the accepted value of X J/kg The correct answer is: 2.5e5 Ink Drawings Ink Drawings Ink Drawings Ink Drawings Ink Drawings       
Untitled picture.png Machine generated alternative text: 7 Question Incorrect Mark 0.00 out of 200 Flag question During the experiment you will measure the latent heat of fusion of ice I-i. You will add ice to an aluminium can filled with water and record the initial and final temperature of the water. All the data listed below is given to three significant figures. The following data is recorded: initial temperature: 64.6 oc final temperature: 35.0 oc mass of aluminium can: 33.8 g mass of can filled with water: 182 g mass of can filled with water and ice: 231 g time taken for ice to melt: 55.0 s specific heat of Al: 900 Jkg-lK-l (this is given to 3 significant figures) specific heat of water: 4180 Jkg-l K- Calculate Li in Jkg- Note: This is simulated data. The answer may not be the accepted value of X J/kg The correct answer is: 2.5e5

 

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