____2.In the Figure Above, Which Diagram Represents the Vector Addition C = B - A?
____1.Identify the following quantities as scalar or vector: the velocity of a snail, the time it takes to run a mile, the age of a cat.
a. / vector, scalar, scalar / c. / vector, scalar, vectorb. / scalar, scalar, vector / d. / scalar, vector, vector
____2.In the figure above, which diagram represents the vector addition C = B - A?
a. / I / c. / IIIb. / II / d. / IV
____3.In the figure above, which diagram represents the vector subtraction C = A+B?
a. / I / c. / IIIb. / II / d. / IV
____4.An ant on a picnic table travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the magnitude of the ant’s displacement relative to its original position?
a. / 70 cm / c. / 52 cmb. / 57 cm / d. / 29 cm
____5.In a coordinate system, a vector is oriented at angle with respect to the x-axis. The x component of the vector equals the vector’s magnitude multiplied by which trigonometric function?
a. / cos / c. / sin b. / cot / d. / tan
____6.In a coordinate system, a vector is oriented at angle with respect to the x-axis. The y component of the vector equals the vector’s magnitude multiplied by which trigonometric function?
a. / cos / c. / sin b. / cot / d. / tan
____7.In a coordinate system, the magnitude of the x component of a vector and , the angle between the vector and x-axis, are known. The magnitude of the vector equals the x component
a. / divided by the cosine of / c. / multiplied by the cosine of b. / divided by the sine of / d. / multiplied by the sine of
___8.A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. What is the magnitude of her horizontal displacement? (Assume no air resistance )
a. / 4.6 m / c. / 13 mb. / 9.2 m / d. / 15 m
The figure above shows the path of a ball tossed from a building. Air resistance is ignored.
____8.At what point of the ball’s path shown in the figure above is the vertical component of the ball’s velocity zero?
a. / A / c. / Cb. / B / d. / D
____9.In the figure above, the magnitude of the ball’s velocity is least at location
a. / A. / c. / C.b. / B. / d. / D.
____10.In the figure above, the magnitude of the ball’s velocity is greatest at location
a. / A. / c. / C.b. / B. / d. / D.
____11.In the figure above, the horizontal component of the ball’s velocity at A is
a. / zero.b. / equal to the vertical component of the ball’s velocity at C.
c. / equal in magnitude but opposite in direction to the horizontal component of the ball’s velocity at D.
d. / equal to the horizontal component of its initial velocity.
____12.In the figure above, at which point is the ball’s speed about equal to the speed at which it was tossed?
a. / A / c. / Cb. / B / d. / D
____13.A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. What is the magnitude of her horizontal displacement? (Assume no air resistance )
a. / 4.6 m / c. / 13 mb. / 9.2 m / d. / 15 m
____14.Which of the following is a coordinate system for specifying the precise location of objects in space?
a. / x-axis / c. / frame of referenceb. / y-axis / d. / diagram
____15.A jet moving at 500.0 km/h due east is in a region where the wind is moving at 120.0 km/h in a direction 30.00 north of east. What is the speed of the aircraft relative to the ground?
a. / 620.2 km/h / c. / 588.7 km/hb. / 606.9 km/h / d. / 511.3 km/h
test 2 work sheet
Answer Section
MULTIPLE CHOICE
1.ANS:APTS:1DIF:IIOBJ:3-1.1
2.ANS:CPTS:1DIF:IOBJ:3-1.2
3.ANS:BPTS:1DIF:IOBJ:3-1.2
4.ANS:D
Given
x= 3.0 10 cm
y= 25 cm
x= –15 cm
Solution
PTS:1DIF:IIIAOBJ:3-2.2
5.ANS:APTS:1DIF:IOBJ:3-2.3
6.ANS:CPTS:1DIF:IOBJ:3-2.3
7.ANS:APTS:1DIF:IIOBJ:3-2.3
881 8.. ANS:B
8.ANS:BPTS:1DIF:IOBJ:3-3.2
9.ANS:BPTS:1DIF:IIOBJ:3-3.2
10.ANS:DPTS:1DIF:IIOBJ:3-3.2
11.ANS:DPTS:1DIF:IIOBJ:3-3.2
12.ANS:CPTS:1DIF:IIOBJ:3-3.2
13.ANS:B
Given
vi = 12 m/s at 20.0° above the horizontal
Solution
PTS:1DIF:IIICOBJ:3-3.3
14.ANS:CPTS:1DIF:IOBJ:3-4.1
15.ANS:B
Given
vpa = velocity of plane relative to the air = 500.0 km/h east
vag=velocity of air relative to the ground = 120.0 km/h 30.00° north of east
Solution
PTS:1DIF:IIIBOBJ:3-4.2