1.Which of the following values are vectors? (Choose all that apply)

	74oC
	21kilometers north
	Increase of19Kelvin
	11.5mm
	1cm in the positivex-direction
	4meters

2. Edna's basketball coach is having her exercise where she starts at the south end of the court, runs28meters north to the other end of the court, then turns around and runs back to where she started. When she completes this drill, what is the magnitude of her displacement?

	28m
	56m
	0m
	14m

3.Vectors are often drawn as rays. What does the length of the ray represent?

	the direction of the vector
	the magnitude of the vector
	length does not mean anything
	the frame of reference

4. John is at the park playing fetch with his cat. He throws the ball1m south, and his cat retrieves the ball and returns it to John. John then throws the ball3meters, and the cat again collects the ball and returns it to John. When the cat returns for the second time, what distance has the cat traveled?

	6m
	8m
	4m
	2m

5.Vectors can be added visually. How is this done?

	by arranging the vectors head to tail
	by arranging the vectors head to head
	by arranging the vectors by length
	by arranging the vectors tail to tail

6. When a person is walking in a straight line, they are also spinning as the Earth rotates, as well as revolving around the Sun. How do physicists avoid these complications in motion problems?

	They only concern themselves with speed, not velocity.
	They establish a fixed frame of reference.
	They represent all of these factors as vectors.
	They take all of these factors into account in their calculations.

7. Vectors are often drawn as rays with an arrow at one end. Why does it matter that the arrow is on the correct end of the vector?

	The arrow represents the direction of the vector.
	The arrow can be placed at either end of the ray.
	The arrow is used to define the frame of reference.
	The arrow represents the magnitude of the vector.

8. How can you correctly identify a scalar quantity?

	Scalars have a magnitude and direction.
	Scalars only have a magnitude.
	Scalars are not used in physics.
	Scalars only have a direction.

9.Janine is a police officer patrolling a street. She drives 2.2 km east, then 4.4 km west, then 1.7 km east. If east is the positive direction, which of the following equations are accurate?

	d=0.5km
	d=0.5km
	d=8.3km
	d=8.3km
	d=0.5km
	d=0.5km

10. Cory is at the park playing fetch with his dog. He throws the ball23m south, and his dog retrieves the ball and returns it to Cory. Cory then throws the ball18meters, and the dog again collects the ball and returns it to Cory. When the dog returns for the second time, what distance has the dog traveled?

	82m
	36m
	23m
	0m

11. Which of the following statements about the independent variable are correct?

		Scientists adjust the dependent variable to see its impact in the independent variable.
		A hypothesis predicts a relationship between the independent and dependent variable.
		The independent variable is mentioned in the hypothesis.
		The independent variable is manipulated by the scientist.
		The independent variable is held constant during an experiment.

12. A certain chemical reaction produces 0.0450 grams of product. How many significant figures does this measurement have?

		4
		5
		2
		3

13. Robert is performing an experiment, testing to see if dissolving salt in water makes the water corrode steel rods more quickly. In this experiment, what are some values that Robert will want to hold constant.

		the type of steel the rods are made from
		the amount of time the rods spend in the saltwater
		the amount of salt dissolved in the water
		the temperature of the saltwater
		the amount of corrosion on each steel rod

14. Rochelle is a chemist who primarily studies thermodynamics. Which of the following topics might Rochelle research for her job?

		the temperature required to melt a certain metal
		how light is affected by passing through a plastic lens
		how subatomic particles behave at extremely high speeds
		the amount of heat produced by a certain reaction
		the vibrations that are produced by musical instruments
		how a new engine converts thermal energy into work

15. Which of the following are examples of some of the environmental costs of technological development?

		reduction in greenhouse gas emissions
		loss of forest and water resources
		more waste in landfills
		increased recycling of heavy metals
		less face-to-face communication

16. Lynn has observed an interesting phenomenon that she would like to experiment on further. Which of the following activities may be part of her next step in the scientific method?

		look at prior experiments
		an hypothesis
		create charts and graphs
		analyze the raw data
		determine the independent variable
		read articles about the topic

17. Richard has just completed his science experiment, and collected all of the data. What is the next step that Richard needs to complete?

		recognize a problem
		form a hypothesis
		analyze results
		background research

18. Dylan has made two different chemical batteries for a physics project. He is measuring how much voltage the batteries each produce. The first battery produces 3.12 volts, and the second battery produces 2.8 volts. Using the correct number of significant figures, how much greater was the voltage produced by the first battery, compared to the second?

		0.32 volts
		0.320 volts
		0.3 volts
		0.3200 volts

19. Raven is a geologist. She is measuring something called the porosity of a rock. The actual porosity of the rock sample is 0.114. Raven measures the porosity as 0.120. What is Raven's percent error on this measurement?

		0.600%
		0.006%
		0.0526%
		5.26%