Q: Which of the following is the correct formula for average velocity?

$$\frac{\text{displacement}}{\text{time elapsed}}$$

Question 1

Which of the following statements about significant figures is correct?

Accepted Answer

Calculators may give too many or too few significant figures, so results should be rounded appropriately.

Question 2

The SI unit of length is defined by:

Accepted Answer

The length of the path traveled by light in $$1/299,792,458$$ seconds.

Question 3

Which SI prefix corresponds to $$10^{-9}$$?

Accepted Answer

nano

Question 4

A mountain is 1,000 meters high. What is its height in feet? (Given: $$1~	ext{m} = 3.28084~	ext{ft})$$

Accepted Answer

$$32,808.4~	ext{ft}$$

Question 5

Which of the following is a correct dimensional analysis for speed?

Accepted Answer

$$[L/T]$$

Question 6

If a physical equation adds two quantities, what must be true about their dimensions?

Accepted Answer

They must have the same dimensions.

Question 7

A car travels 60 km north, then 80 km east. What is the magnitude of its displacement from the starting point?

Accepted Answer

$$100~	ext{km}$$

Question 8

Which of the following best describes displacement?

Accepted Answer

The change in position from the starting point to the ending point.

Question 9

An object moves with uniform motion. Which statement is true?

Accepted Answer

Its position-versus-time graph is a straight line.

Question 10

If an object starts at $$x_1 = 10$$~	ext{m}$$ and ends at x_2$ = 40~	ext{m}$$, what is its displacement?

Accepted Answer

$$30~	ext{m}$$

Question 11

A runner completes a lap around a 400 m track, ending at the starting point. What is the runner's displacement?

Accepted Answer

$$0~	ext{m}$$

Question 12

Which of the following is NOT a base unit in the SI system?

Accepted Answer

Gram

Question 13

A cyclist travels 120 meters in 20 seconds. What is their average speed?

Accepted Answer

$$6~	ext{m/s}$$

Question 14

Which of the following is the correct formula for average velocity?

Accepted Answer

$$\frac{	ext{displacement}}{	ext{time elapsed}}$$

Question 15

A student estimates the number of molecules in a glass of water by rounding all numbers to one significant figure. What technique are they using?

Accepted Answer

Order of magnitude estimation

Question 16

Which of the following is a correct statement about dimensional analysis?

Accepted Answer

It is used to check if the units in a calculation are consistent.

Question 17

A train moves at a constant velocity of $$20~	ext{m/s}$$ for $$30~	ext{s}. $$What is its displacement?

Accepted Answer

$$600~	ext{m}$$

Question 18

Which of the following is a correct application of the position equation for uniform motion?

Accepted Answer

$$x_f = x_i + v \Delta t$$

Question 19

A student is sitting on a train moving at $$30~	ext{km/h}$$ east. They walk at $$5~	ext{km/h}$$ east relative to the train. What is their speed relative to the ground?

Accepted Answer

$$35~	ext{km/h}$$

Question 20

Which of the following is true about reference frames?

Accepted Answer

The choice of reference frame affects how motion is described.

Introduction to Physics: Measurement, Units, and Kinematics

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