1F Homework 1 Ch 1 2

Homework 1 (Ch. 1-2)

1. Make five qualitative and five quantitative observations about the room in which you now sit.
a. Quantitative
i. Have 1 desk ii. Have 2 monitors iii. Have 6 pillows on my bed iv. Dresser has 5 drawers
v. Have 1 TV
b. Qualitative
i. Desk is steel and sturdy glass ii. Monitors are black and made manufactured by Dell iii. Pillows are filled with cotton or goose features iv. Dresser is made of a dark wood
v. TV was purchased at Best Buy and was manufactured by Samsung
2. Describe how you would set up an experiment to test the relationship between completion of assigned homework and the final grade you receive in the course.
3. As part of a science project, you study traffic patterns in your city at an intersection in the middle of downtown. You set up a device that counts the cars passing through this intersection for a 24-hour period during a weekday. The graph of hourly traffic looks like this.

a. At what time(s) does the highest number of cars pass through the intersection?
b. At what time(s) does the lowest number of cars pass through the intersection?
c. Briefly describe the trend in numbers of cars over the course of the day.
d. Provide a hypothesis explaining the trend in numbers of cars over the course of the day.
e. Provide a possible experiment that could test your hypothesis.

4. Although, in general, science has advanced our standard of living tremendously, there is sometimes a “dark side” to science. Give an example of the misuse of science and explain how this has had an adverse effect on our lives.
5. Consider the addition of “15.4” to “28”. What would a mathematician say the answer is? What would a scientist say? Justify the scientist’s answer, not merely citing the rule, but explaining it.
6. Consider multiplying “26.2” by “16.43”. What would a mathematician say the answer is? What would a scientist say? Justify the scientist’s answer, not merely citing the rule, but explaining it.
7. Show how converting numbers to scientific notation can help you decide which digits are significant.
8. Carry out the indicated temperature conversions.
a. -201oF to kelvins
b. -201oC to kelvins
c. 351oC to Fahrenheit degrees
d. -150oF to Celsius degrees
9. The element bromine at room temperature is a liquid with a density of 3.12 g/mL. Calculate the mass of 125 mL of bromine. What volume does 85.0 g of bromine occupy?
10. Suppose your car is rated at 45 mi/gal for highway use and 38 mi/gal for city driving. If you wanted to write your friend in Spain about your car’s mileage, what ratings in kilometers per liter would you report?
11. Complete the following table:

Number
Exponential Notation
# of Significant Figures
900.0

3007

23,450

270.0

437,000

12. (2 points) For each of the mathematical expressions given:
a. Tell the correct number of significant figures for the answer.
b. Evaluate the mathematical expression using correct significant figures in the result.

# of Significant Figures
Result
0.0394 x 13

15.2 – 2.75 + 16.67

3.984 x 2.16

0.517 / 0.2742

1.842 + 45.2 + 87.55

12.62 + 1.5 + 0.25

13. (2 points) The longest river in the world is the Nile River with a length of 4145 mi. How long is the Nile in cable lengths, meters, and nautical miles?
Use these exact conversions to help solve the problem: 6 ft = 1 fathom 100 fathoms = 1 cable length 10 cable lengths = 1 nautical mile 3 nautical miles = 1 league