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Prelude Problems

1. Determine whether or not the following statements qualify for a hypothesis. Answer yes or no and explain why.

  • Chlorophyll makes the grass green.

     

     

  • There is life on other planets outside our Solar System.

     

     

  • There is night and day on our planet because life needs the alternation between light and darkness.

     

     

  • The tides are caused by the moon.

     

     

    2. What is often misunderstood when people say, “oh, that is just a theory?”

     

     

    3. Give an example of a “theory” that is not scientific and explain why.

     

     

    4. Explain what it means when we say a theory could never really be proven.

     

     

    5. Distinguish between a scientific fact, principle, and law.

     

     

    6. Outline and describe the five steps to the scientific method.

    One:

     

     

    Two:

     

     

    Three:

     

     

    Four:

     

     

    Five:

     

     

    Perform the following Unit Conversions:

    7. one day to minutes (1440 min)

     

     

    8. one year to seconds (31536000 s)

     

     

    9. 1.0 km to miles (.6214 mi)

     

     

    10. 2.0 feet to inches (24 in)

     

     

    11. 1.0 foot to centimeters (30.48 cm)

     

     

    12. one day to seconds (86400 s)

     

     

    13. 1.0 cm² to in² (.1550 in²)

     

     

    14. 5.0 Newtons to pounds (1.124 lb)

     

     

    15. 2.0 acres to ft² (87120 ft²)

     

     

    16. 5.0 m/s to km/h (18 km/h)

     

     

    17. 10.0 km/h to m/s (2.78 m/s)

     

     

    18. 30.0 miles/h to m/s (13.4 m/s)

     

     

    19. 5.0 gallons to liters (18.9 liters)

     

     

    20. 50.0 ft/s to miles/h (34.09 mph)

     

     

    Perform the following calculations using Significant Digits:

    21. 5.05*100 (500)

     

     

    22. (4.5 + 2.01)*20 (100)

     

    23. 32.65/20.02*3.4 (5.5)

     

     

    24. (3.4 – 2.88)/5.3 (.094)

     

     

    25. 100,001*.00020 (20; the zero is significant)

     

     

    26. How is the direct straight line relationship similar to the direct square relationship? Give an example.

     

    How are they different? Give an example.

     

     

    27. How is the direct straight line relationship similar to the inverse relationship? Give an example.

     

    How are they different? Give an example.

     

     

    28. How is the inverse square relationship similar to the inverse relationship? Give an example.

     

    How are they different? Give an example.

     

     

    29. If x went from the value of 10 to a value of 20, and y went from the value of 5 to the value of 20, what relationship do they have?

     

    Sketch the graph.

     

     

    30. If x went from the value of 100 to the value of 25, and y went from the value of 20 to the value of 80, what relationship do they have?

     

    Sketch the graph.