49 Order from the highest to the lowest: a) 154.5 cm 20 000 nm 0.000 154 km b) 25 min 250 s 0.25 h c) 36 km/h 9 m/s 990 cm/s 50 English-speaking countries use their own units to measure length and therefore speed. Write these speeds in SI units. Cheetah Tortoise Football Tennis ball 75 mph (miles/hour) 2 625 in/min (inches/min) 127 ft/s (feet/s) 75 yd/s (yards/s) Equivalent values in SI units: Inch (in) Foot (ft) Yard (yd) Mile (mi) 2.54 cm 30.48 cm 91.44 cm 1.609 km 51 A computer's hard drive is 480 gigabytes. What will be its total storage capacity if we connect a 2 terabyte external hard drive? 52 Light travels at 300 000 km/s. Calculate its speed in km/h and write the result in scientific notation. Laboratory work 53 Match each symbol with the danger it represents: a) c) e) b) d) f ) 54 Label this laboratory equipment. a) b) c) d) Explosive Irritant Corrosive Oxidiser Toxic Flammable 1 Video tutorial on the scientific method Working in a group, you are going to record a video. It will be a tutorial that explains the scientific method by applying it to the chosen phenomenon. Plan the scenes you are going to record. They should clearly follow the steps of the scientific method. Write down the script for the video with information from each of the steps. Use the vocabulary you have learned in this unit. List the material that you will need. Write down some basic safety rules that you will have to follow while you are conducting the experiment. Arrange your recorded scenes in the same order as the steps in the scientific method. Design a poster to promote the video. Include your experiment or your hypothesis in the poster. Present the video to your class. You can also create a document of the results obtained, graphs and your conclusions. Making the video, you have learned how to use the steps of the scientific method to study a physical or chemical phenomenon. Now you can apply the scientific method to achieving the UN's SDGs! W E L L D O N E ! CHALLENGE 33
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