Chapter 4

Which of the following represents the vector resulting in the subtraction of the displacement vectors d2 - d1 shown in the figure? a. straight to right b. to south west c. to north west d. to north east

D

In a school playground, a child runs 5 m in the x-direction and then 2.0 m in the -y-direction. Which of the following expressions represents the magnitude of the child's resultant displacement? a. (5m) + (-2m) b. √(5m) - √(2m) c.√(5m)^2-(2m)^2 d.√(5m)^2+(-2m)^2

D

In question 1, another student chose east as the direction of the +x-axis. At what orientation with respect to the +x-axis should this student draw the vector representing the velocity of the second plane? a. parallel to the +x-axis b. 90.0 degrees clockwise from the +x-axis c. 75.0 degrees clockwise from the +x-axis d. 15.0 degrees counterclockwise from the +x-axis

D

Which of the following quantities used to describe motion is an example of a vector quantity? a. distance b. speed c. time d. average velocity

D

A vector remains unchanged a. if it is moved in any direction b. only if it is moved parallel to its original direction c. only if it is not moved d. only if it rotated perpendicular to its original direction

B

If vectors are moved according to the rule of the triangle method of vector addition, then the resultant vector is drawn a.from the tail of the first vector to the tail of the last vector b.from the tail of the first vector to the tip of the last vector c.from the tip of the first vector to the tail of the last vector d.from the tip of the first vector to the tip of the last vector

B

Which of the displacements, when added in the order given, will yield a displacement equal to d1 + d2 +d3 a. d3 + d4 + d1 b. d2 + d1 +d3 c. d2 + d4 +d3 d. d4 + d3 + d1

B

A skier slides onto a horizontal patch of slushy snow at velocity vskier, and slows to a constant speed without changing directions. Which of the following expressions could be the skier's resulting velocity? a. -3vskier b. +1/4vskier c. -1/5vskier d. all of the above

C

In a diagram, a student draws a vector representing the velocity of a plane traveling at 525 km/h 18.0 degrees east of north as a vector lying along the +x-axis. To represent the velocity of another plane traveling at 478 km/h 75.0 degrees east of north on the diagram, at what orientation with the respect of the +x-axis should the student draw this vector? a. 93.0 degrees clockwise from the +x-axis b. 75.0 degrees clockwise from the +x-axis c. 57.0 degrees clockwise from the +x-axis d. 75.0 degrees counterclockwise from the +x-axis

C

In a diagram, the length of a vector arrow represents the a. type of vector b. direction of the vector c. magnitude of the vector d. cause of the vector

C

In the figure, a. d1 = d4 b. d1 = -d4 c. d2 = -2(d4) d. d3 = 0.5(d1)

C