Physics Ch 3 Test

-3Vstudent

A student walks from the door of the house to the end of the driveway and realizes that he missed the bus. The student runs back to the house, traveling three times as fast. Which of the following is the correct expression for the return velocity if the initial velocity is Vstudent?

scalar, scalar, vector

Identify the following quantities as scalar or vector: the speed of a snail, the time it takes to run a mile, the free-fall acceleration.

cos 0

In a coordinate system, a vector is oriented at angle 0 with respect to the x-axis. The x component of the vector equals the vector's magnitude multiplied by which trigonometric function?

sin 0

In a coordinate system, a vector is oriented at angle 0 with respect to the x-axis. The y component of the vector equals the vector's magnitude multiplied by which trigonometric function?

divided by the cosine of 0

In a coordinate system, the magnitude of the x component of a vector and 0, the angle between the vector and x-axis, are known. The magnitude of the vector equals the x component

II

In the figure above, which diagram represents the vector addition C = A + B?

IV

In the figure above, which diagram represents the vector subtraction C = A-B?

1/2 Vcar

A car travels down a road at a certain velocity, vcar. The driver slows down so that the car is traveling only half as fast as before. Which of the following is the correct expression for the resulting velocity?

Vplayer, -2Vplayer

A football player runs in one direction to catch a pass, then turns and runs twice as fast in the opposite direction toward the goal line. Which of the following is a correct expression for the original velocity and the resulting velocity?

2

How many displacement vectors shown in the figure above have components that lie along the y-axis and are pointed in the -y direction?

4

How many displacement vectors shown in the figure above have horizontal components?

scalar, scalar, vector

Identify the following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, wind velocity.

vectors

Multiplying or dividing vectors by scalars results in

d1 and d3

Which displacement vectors shown in the figure above have vertical components that are equal?

scalar

Which of the following is a physical quantity that has a magnitude but no direction?

vector

Which of the following is a physical quantity that has both magnitude and direction?

velocity

Which of the following is an example of a vector quantity?

x-axis: horizontal along the ground; y-axis: up and down

Which of the following is the best coordinate system to analyze a painter climbing a ladder at an angle of 60° to the ground?