$$1 \text{ m/s} \times 900 \text{ s} = 900 m$

$$20 \text{ m/s} \times 120 \text{ s} = 2400 m$

$$\sin \theta = \frac{\text{Opposite}}{\text{Hypotenuse}}$$

Question 1

Which of the following is the correct SI base unit for mass?

Accepted Answer

kilogram (kg)

Question 2

A student walks 120 meters east, then 50 meters north. What is the magnitude of the student's net displacement?

Accepted Answer

$$\sqrt{120^2$ + 50^2$} = 130$$ meters$

Question 3

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy refers to how close a measurement is to the true value, while precision refers to how close repeated measurements are to each other.

Question 4

A car travels from $$x_i = 10 m to$$ $$x_f = -15 m in$$ $$5$$ seconds. What is its average velocity?

Accepted Answer

$$\frac{-15 - 10}{5} = -5 m/s$

Question 5

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 6

If a measurement is reported as $$3.40 	imes 10^2$ m, how many significant figures does it have?

Accepted Answer

3

Question 7

A runner completes a 400 m lap in 50 s. What is her average speed?

Accepted Answer

$$\frac{400}{50} = 8 m/s$

Question 8

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 9

A goose flies 60 km north, then 80 km east. What is the straight-line distance from its starting point?

Accepted Answer

$$\sqrt{60^2$ + 80^2$} = 100 km$

Question 10

Which of the following is NOT a fundamental SI unit?

Accepted Answer

Newton (N)

Question 11

A student estimates their walking speed as 1 m/s. If they walk for 15 minutes, approximately how far do they travel?

Accepted Answer

$$1 	ext{ m/s} 	imes 900 	ext{ s} = 900 m$

Question 12

Which of the following best describes the particle model in physics?

Accepted Answer

Treating an object as if all its mass is concentrated at a single point

Question 13

If $$\vec{A}$$ has components $$A_x = 3$$ and $$A_y = 4$$, what is the magnitude of $$\vec{A}$$?

Accepted Answer

$$\sqrt{3^2$ + 4^2$} = 5$$

Question 14

Which of the following is an example of an order-of-magnitude estimate?

Accepted Answer

Estimating the population of a city as $$10^6$$ people

Question 15

A measurement is recorded as $$2.50 	imes 10^3$ kg. If you multiply this by 3.0$, how many significant figures should the answer have?

Accepted Answer

2

Question 16

Which of the following is a scalar quantity?

Accepted Answer

Time

Question 17

A car moves at a constant speed of 20 m/s for 2 minutes. How far does it travel?

Accepted Answer

$$20 	ext{ m/s} 	imes 120 	ext{ s} = 2400 m$

Question 18

Which trigonometric function relates the opposite side and hypotenuse in a right triangle?

Accepted Answer

$$\sin 	heta = \frac{	ext{Opposite}}{	ext{Hypotenuse}}$$

Question 19

Which of the following is an example of a derived SI unit?

Accepted Answer

Newton (N)

Question 20

A ball is thrown at an angle $$	heta$$ above the horizontal. Which vector best represents its velocity at the highest point of its trajectory?

Accepted Answer

A horizontal vector

Fundamentals of Physics I: Representing Motion, Measurement, and Vectors

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