# PHY 442exp1.docx

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PHY 442 EXPERIMENT 1: MEASUREMENT NAME : NOR HANINDA BT NOR HAMID STUDENT ID : 2014441304 GROUP : ASB1CF PARTNER’S NAME : LECTURER’S NAME : OBJECTIVE: To determine the density of a ball bearing and a piece of wire. APPARATUS: 1. Glass block 2. Ball bearing 3. Wire 4. Vernier calliper 5. Micrometer screw gauge 6. Ruler 7. Electronic balance THEORY: Density of a substance is defined as the mass per unit volume .densit
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PHY 442 EXPERIMENT 1: MEASUREMENT  NAME : NOR HANINDA BT NOR HAMID STUDENT ID : 2014441304 GROUP : ASB1CF PARTNER’S NAME : LECTURER’S NAME :  OBJECTIVE: To determine the density of a ball bearing and a piece of wire. APPARATUS: 1.   Glass block 2.   Ball bearing 3.   Wire 4.   Vernier calliper 5.   Micrometer screw gauge 6.   Ruler 7.   Electronic balance THEORY: Density of a substance is defined as the mass per unit volume     .density can be determined experimentally by measuring the mass and volume of a sample of substance and calculating the ratio m/V. To determine the density of cylinder, the mass m, diameter d, and height h, of the cylinder can be measured using an electronic balance and a vernier calliper. The volume and uncertainty of the cylinder can be calculated from the following formula. Volume of cylinder:   r  2 h  with    Uncertainty of the volume: (     )  The volume and uncertainty of the ball bearing can be calculated from the following formula. Volume of ball bearing:    r  3  with    Uncertainty of the volume:  PROCEDURE:   A.   Ball bearing 1.   The mass, kg   of the ball bearing are weighed by using the electronic balance prepared in the laboratory. 2.   The diameters, m  of the ball bearing are measured using Micrometer Screw Gauge and Vernier calliper. The average of the diameters is calculated. 3.   The all data obtained are recorded in the Table 1.0. 4.   The volume, m 3 , density, kgm -3   and the uncertainty of the wire are calculated and results obtained are recorded in the Table 1.0. B.   Wire 1.   The mass, kg   of the wire are weighed by using the electronic balance prepared in the laboratory. 2.   The diameters, m  of the wire are measured using Micrometer Screw Gauge and the average of the diameter is calculated. 3.   The all data obtained are recorded in the Table 1.0. 4.   The volume, m 3 , density, kgm - 3  and the uncertainty of the wire are calculated and results obtained are recorded in the Table 1.0. C.   Glass block 1.   The mass, kg   of the glass block are weighed by using the electronic balance prepared in the laboratory. 2.   The dimension (length, width and height) of the glass block are measured using Vernier calliper. 3.   The all data obtained are recorded in the Table 1.0. 4.   The volume, m 3 , density, kgm -3  and the uncertainty of the wire are calculated and results obtained are recorded in the Table 1.0.  POST LABORATORY QUESTIONS: 1.   Why is it better to take many readings for the same measured quantity compared to a single reading? Take many readings for the same measured quantity is better compared to a single reading because it can reduce the uncertainty in the average value, whereas a precise and accurate instrument requires few repeated measurements to obtain a good measurement. 2.   If the volume of the ball bearing was first determined by using a micrometer, what difference does it make if a Vernier calliper is used instead? If a Vernier calliper is used instead of micrometer to determine the volume of ball  bearing, the measurement will have less accuracy because the Vernier calliper usually used for a larger measurement range and its good for measuring rectangular dimensions and circular diameters such as the inside diameter of a hollow cylindrical object while micrometer provides for accurate measurement of small length.  3.   Suppose that you were given an irregularly shaped object that floats, describe how you would experimentally determine its volume? Irregularly shaped object that floats can be experimentally determine its volume by using Archimedes’s Principle.   4.   Table 1 shows the densities of some materials. Based on the densities in Table 1 can you determine from what materials the ball bearing and the wire are made of? Explain your answer. Table 1: Densities of Materials

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