Deck 1: Measurements in Physics, Motion in One Dimension and Motion in Two Dimensions

Question 1

What is $\frac{0.674}{0.74}$ to the proper number of significant figures?

A) 0.91
B) 0.911
C) 0.9108
D) 0.9

Answer 1

0.91

Question 2

A 2-L bottle of soda gives you more for your money than a 2-qt bottle would, at the same price.

Answer 2

True

Question 3

Zeros at the beginning of a number are significant.

Answer 3

False

Question 4

Why so much emphasis upon units? Why are units considered to be as important as the quantity, "magnitude", of something?

Question 5

Express 0.0015671 kg to three significant figures.

Question 6

A sports car has an average acceleration of 13.1 $\frac{\text { miles }}{\text { hour } \cdot \text { sec }}$ . How long does it take for the car to reach 60.0 mi/h, if it starts from rest?

A) 4.6 s
B) 5.5 s
C) 3.1 s
D) 8.8 s

Question 7

The equation s_f = s_i + v_is ?t + $\frac{1}{2}$ (?t)² is valid for all types of motion because it is a fundamental equation of physics.

Question 8

The components of vectors $\overrightarrow{\mathbf{B}}$ and $\overrightarrow{\mathrm{C}}$ are given as follows:
B_x = -9.2 C_x = -4.5
B_y = -6.1 C_y = + 4.3
The angle (less than 180 degrees) between vectors $\overrightarrow{\mathbf{B}}$ and $\overrightarrow{\mathrm{C}}$ , in degrees, is closest to:

A) 77
B) 103
C) 10
D) 170
E) 84

Question 9

A hiker walks 6.7 miles to the east in 5.1 hours, then turns around and walks 1.1 miles to the west in 1.0 hours. What was her average velocity during the trip?

A) 0.92 mph
B) 1.3 mph
C) 1.2 mph
D) 3.9 mph

Question 10

Vector A points to the north and has length A. Vector B points to the east and has length B = 2.0 A. Find the magnitude of C= 4 A + B in terms of A.

A) 4.5A
B) 6A
C) 3.6A
D) 3.1A

Question 11

The sum of the two vectors A and B is equal to zero. What can you conclude about A and B?

Question 12

Shown here are the velocity and acceleration vectors for an object in several different types of motion. In which case is the object slowing down and turning to its right?

A)


B)


C)


D)


E)

Question 13

Which of the following ideas is true about projectile motion with no air drag?

A) $\mathrm{v}_{\mathrm{x}}^{2}$ + $\mathrm{v}_{\mathrm{y}}^{2}$ = constant.
B) The acceleration is +g when the object is rising and -g when falling.
C) The velocity of the object is zero at the point of maximum elevation.
D) The trajectory will depend on the object's mass as well as its initial velocity and launch angle.
E) The horizontal motion is independent of the vertical motion.