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Topic 1: Physical Measurements

Topic 1: Physical Measurements. Practice Questions. Practice Questions. Convert the following into metres ( m ) and write in standard form: Distance from London to New York = 5585 km Height of Einstein was 175 cm Thickness of a human hair = 25.4 μm

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Topic 1: Physical Measurements

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  1. Topic 1: Physical Measurements Practice Questions

  2. Practice Questions • Convert the following into metres (m) and write in standard form: • Distance from London to New York = 5585 km • Height of Einstein was 175 cm • Thickness of a human hair = 25.4 μm • Distance to the edge of the universe = 100,000 million million million km a) 5.585 x 106m c) 2.54 x 10-5m b) 1.75 m d) 1026m

  3. Practice Questions • Convert the following times into seconds (s) and write in standard form: • 85 years, how long Newton lived • 2.5 ms, the time taken for a mosquito’s wing to go up and down • 4 days, the time it took to travel to the moon • 2 hours, 52 min 59 s, the time time for the Concord to fly from London to New York a) 2.69 x 109s c) 3.46 x 105s b) 2.5 x 10-3s d) 1.0379 x 104s

  4. Practice Questions • Convert the following masses to kilograms (kg) and write in the standard form: • The mass of an apple = 200 g • The mass of a grain of sand = 0.00001 g • The mass of a family car = 2 tonnes a) 0.2 kg b) 1 x 10-8 kg c) 2 x 103 kg

  5. Practice Questions • Calculate the volume of a room of length 5 m, width 10 m and height 3m. • What is the volume of a human hair with length 20 cm? • Calculate the volume of the Earth (radius = 6.378 x 106m). 4) 150 m3 5) 1.0 x 10-10 m3 6) 1.09 x 1021 m3

  6. Practice Questions • Calculate the mass of the air in the previous room. The density of air is 1.2 kg m-3. • Calculate the mass of a gold bar of length 30 cm, width 15 cm, height 10 cm and density 1.93 x 104 kg m-3. • The Earth has a mass of 5.97 x 1024 kg, calculate its average density. 7) 180 kg 8) 86.85 kg 9) 5.48 x 103 kg m-3

  7. Practice Questions • To determine the area of an object, two lengths l1 and l2 are measured. l1 = 10.25 +/- 0.05 cm l2 = 15.45 +/-0.05 cm. Calculate: • the % uncertainty in l1 • the % uncertainty in l2 • the area of the object • the % uncertainty in the area a) 0.5 % c) 158.36 cm2 b) 0.3 % d) 0.8 %

  8. Practice Questions • A boat travels 4 km west followed by 8 km north. What is the resultant displacement? • A plane flies 100 km north then changes course to fly 50 km east. What is the resultant displacement? • If a boat travels 10 km in a direction 30° east of north, how far north has it traveled? • On his way to the South Pole , Amundsen traveled 8 km in a direction that was 20° west if south. What was his displacement south? • A mountaineer climbs 500 m up a slope that is inclined at an angle 60° to the horizontal. How high has he climbed? 11) 8.94 km, 26.6° 14) 7.52 km 13) 8.66 km 12) 112 km, 26.6° 15) 433 km

  9. Practice Questions a) half area of graph paper used; axes labels and units included; scale; data points; b) absolute uncertainty in Q at 10.0 V = +/- 3nC; absolute uncertainty in Q at 50.0 V = +/- 18nC; correct placing on graph; c) from top of error bar at (50,180) to bottom of error bar (10,30); Use of at least half of the line or algebraic indication; value = 4.3 or 4.3 x 10-9; e) recognize that m = ε°A / d; therefore ε° = dm / A; (0.51 x 10-3)(4.3 x 10-9) / 0.15; 1.5 x 10-11 CV-1m-1; d) CV-1

  10. Practice Questions 2) C 3) A 4) C 5) C

  11. Practice Questions 6) C 7) D 8) B 9) C

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