Question 1

Which of the following statements about significant figures is CORRECT when expressing a measured value?

Accepted Answer

All nonzero digits and zeros between them or after the decimal point are significant.

Question 2

A car travels 60 km north and then 80 km east. What is the magnitude of its displacement?

Accepted Answer

$$100\ \mathrm{km}$$

Question 3

Which of the following best describes a vector quantity?

Accepted Answer

A quantity that has both magnitude and direction.

Question 4

A ball is thrown straight up with an initial velocity of $$20\ \mathrm{m/s}. $$Neglecting air resistance, what is its velocity at the highest point of its trajectory?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 5

Which of the following is the correct SI unit for acceleration?

Accepted Answer

$$\mathrm{m/s^2$}$$

Question 6

A vector $$\vec{A} = (6.00\hat{i} - 4.00\hat{j})\ \mathrm{m} is $$given. What is the unit vector in the direction of $$\vec{A}$$?

Accepted Answer

$$\frac{6.00\hat{i} - 4.00\hat{j}}{7.21}$$

Question 7

Which of the following statements about the acceleration due to gravity $$g$$ near the Earth's surface is TRUE?

Accepted Answer

It is always negative when defined as downward.

Question 8

A projectile is launched horizontally from a cliff with a speed of $$10\ \mathrm{m/s}. $$Which statement about its motion is correct (neglecting air resistance)?

Accepted Answer

Its horizontal velocity remains constant.

Question 9

Which of the following is NOT a scalar quantity?

Accepted Answer

Displacement

Question 10

A cyclist travels 30 km east, then 40 km north. What is the direction of the displacement vector relative to east?

Accepted Answer

$$\arctan\left(\frac{40}{30}\right)$$ north of east

Question 11

Which of the following best describes Newton's First Law of Motion?

Accepted Answer

An object at rest remains at rest, and an object in motion remains in motion at constant velocity unless acted upon by a net external force.

Question 12

A 2 kg object is acted on by a net force of $$10\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$5\ \mathrm{m/s^2$}$$

Question 13

Which of the following is a correct free-body diagram for a book resting on a table?

Accepted Answer

Two forces: gravity downward and normal force upward, equal in magnitude.

Question 14

A car accelerates from rest at $$2\ \mathrm{m/s^2$}$$ for 5 seconds. What is its final velocity?

Accepted Answer

$$10\ \mathrm{m/s}$$

Question 15

Which of the following is the correct vector addition for $$\vec{A} = 3\hat{i} + 4\hat{j}$$ and $$\vec{B} = -3\hat{i} + 2\hat{j}$$?

Accepted Answer

$$0\hat{i} + 6\hat{j}$$

Question 16

A ball is dropped from a height of $$20\ \mathrm{m}. $$How long does it take to reach the ground? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.02\ \mathrm{s}$$

Question 17

Which of the following is a correct statement about the motion of an object moving in a circle at constant speed?

Accepted Answer

The velocity is changing because the direction is changing.

Question 18

A hockey puck slides on ice with constant velocity. Which statement is consistent with Newton's First Law?

Accepted Answer

No net force acts on the puck.

Question 19

A 5 kg box is pulled with a force of $$20\ \mathrm{N}$$ across a frictionless surface. What is its acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Question 20

Which of the following is the best example of a situation where the net force on an object is zero?

Accepted Answer

A book resting on a table.

Fundamental Concepts in College Physics: Study Guide and Procedures

Guida di studio - Domande di pratica

Study guide - Flashcard