Question 1

You are taking a turn at 23.0 m/s on a ramp of radius 39.0 m.What is your acceleration?

Accepted Answer

A) 13.6 m/s2 
B) 0.590 m/s2 
C) 66.1 m/s2 
D) 1.70 m/s2 
A) 13.6 m/s2 
B) 0.590 m/s2 
C) 66.1 m/s2 
D) 1.70 m/s2 A

Question 2

Jeff ran up the hill at 7.0 m/s.The horizontal component of Jeff's velocity vector was 5.1 m/s.What was the vertical component of Jeff's velocity?

Accepted Answer

A) 4.8 m/s 
B) 4.3 m/s 
C) 3.8 m/s 
D) 3.4 m/s 
A) 4.8 m/s 
B) 4.3 m/s 
C) 3.8 m/s 
D) 3.4 m/s A

Question 3

Vector   has length 4 units and directed to the north.Vector   has length 9 units and is directed to the south.Calculate the magnitude and direction of   +   .

Accepted Answer

A) 5 units,south 
B) 5 units,north 
C) 13 units,north 
D) 13 units,south 
A) 5 units,south 
B) 5 units,north 
C) 13 units,north 
D) 13 units,south A

Question 4

A rabbit trying to escape a fox runs north for 8.0 m,darts northwest for 1.0 m,then drops 1.0 m down a hole into its burrow.What is the magnitude of the net displacement of the rabbit?

Accepted Answer

A) 8.8 m 
B) 8.1 m 
C) 66 m 
D) 10 m 
A) 8.8 m 
B) 8.1 m 
C) 66 m 
D) 10 m

Question 5

A plane flying at 70.0 m/s suddenly stalls.If the acceleration during the stall is 9.8 m/s2 directly downward,the stall lasts 5.0 s,and the plane was originally climbing at 25° to the horizontal,what is the velocity after the stall?

Accepted Answer

A) 66 m/s at -17° 
B) 66 m/s at +17° 
C) 80 m/s at -37° 
D) 80 m/s at +37° 
A) 66 m/s at -17° 
B) 66 m/s at +17° 
C) 80 m/s at -37° 
D) 80 m/s at +37°

Question 6

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?

Accepted Answer

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

Question 7

Karim rides his bike with velocity   = ( 8.4 m/s,25° north of east)for 10 minutes.How far to the north of his starting position does Karim end up?

Accepted Answer

A) 2100 m 
B) 4600 m 
C) 76 m 
D) 36 m 
A) 2100 m 
B) 4600 m 
C) 76 m 
D) 36 m

Question 8

The components of a vector will be the same no matter what coordinate system is used to express that vector.

Accepted Answer

A) True 
 B)False

Question 9

Bob and Biff throw identical rocks off a tall building at the same time.Bob throws his rock straight downward.Biff throws his rock downward and outward such that the angle between the initial velocity of the rock and the horizon is 30 degrees.Biff throws the rock with a speed twice that of Bob's rock.Which rock hits the ground first (assume the ground near the building is flat)?

Accepted Answer

A) They hit at the same time. 
B) Bob's rock 
C) Biff's rock 
D) Impossible to determine 
A) They hit at the same time. 
B) Bob's rock 
C) Biff's rock 
D) Impossible to determine

Question 10

Vector   points to the north and has length A.Vector   points to the east and has length B = 2.5A.Find the direction of   = 7.4   +   .Express your answer as an angle relative to east.

Accepted Answer

A) 71° north of east 
B) 19° north of east 
C) 82° north of east 
D) 60° north of east 
A) 71° north of east 
B) 19° north of east 
C) 82° north of east 
D) 60° north of east

Question 11

A boy throws a rock with an initial velocity of 3.13 m/s at 30.0° above the horizontal.How long does it take for the rock to reach the maximum height of its trajectory?

Accepted Answer

A) 0.160 s 
B) 0.282 s 
C) 0.313 s 
D) 0.441 s 
A) 0.160 s 
B) 0.282 s 
C) 0.313 s 
D) 0.441 s

Question 12

The magnitude of the resultant of two vectors must be greater than or equal to the magnitude of each of these vectors.

Accepted Answer

A) True 
 B)False

Question 13

A ball is thrown at an angle above the horizontal from the top of a cliff and feels no air resistance.A runner at the base of the cliff moves horizontally so that she is always under the ball.In this runner's reference frame,the path of the ball is a straight line rather than a parabola.

Accepted Answer

A) True 
 B)False

Question 14

A boat crosses a river at a constant engine speed of 8.0 cm/s under the influence of a constant perpendicular current acceleration of 0.060 m/s2.How far off a straight course does it drift in 2.3 min?

Accepted Answer

A) 570 m 
B) 0.16 m 
C) 4.1 m 
D) 1700 m 
A) 570 m 
B) 0.16 m 
C) 4.1 m 
D) 1700 m

Question 15

To achieve maximum range of a projectile,for a fixed initial velocity,on Earth we must launch it at 45°.If we were at the moon should we do the same?

Accepted Answer

Yes,only g will be different a

Question 16

A projectile is fired at time t = 0.0 s,from point 0 at the edge of a cliff,with initial velocity components of vox = 50 m/s and voy =200 m/s.The projectile rises,then falls into the sea at point P.The time of flight of the projectile is 50.0 s.   In the figure,the y-coordinate of the projectile when its x-coordinate is 1000 m is closest to:

Accepted Answer

A) + 2040 m 
B) 150 m 
C) - 150 m 
D) + 1240 m 
E) + 600 m 
A) + 2040 m 
B) 150 m 
C) - 150 m 
D) + 1240 m 
E) + 600 m

Question 17

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

Accepted Answer

A)    +
  = 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. 
A)    +
  = 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.

Question 18

A football is kicked toward the goal posts and feels no air resistance.While it is in the air,the only force acting on it is 9.8 m/s2 downward due to gravity.

Accepted Answer

A) True 
 B)False

Question 19

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?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 20

You can launch a projectile with a fixed initial speed but at any angle above the horizontal,and it feels no air resistance.The time for it to return to the ground does not depend on the angle at which you launch it.

Accepted Answer

A) True 
 B)False

Exam 3: Vectors and Motion in Two Dimensions

You are taking a turn at 23.0 m/s on a ramp of radius 39.0 m.What is your acceleration?

Jeff ran up the hill at 7.0 m/s.The horizontal component of Jeff's velocity vector was 5.1 m/s.What was the vertical component of Jeff's velocity?

Vector has length 4 units and directed to the north.Vector has length 9 units and is directed to the south.Calculate the magnitude and direction of + .

A rabbit trying to escape a fox runs north for 8.0 m,darts northwest for 1.0 m,then drops 1.0 m down a hole into its burrow.What is the magnitude of the net displacement of the rabbit?

A plane flying at 70.0 m/s suddenly stalls.If the acceleration during the stall is 9.8 m/s2 directly downward,the stall lasts 5.0 s,and the plane was originally climbing at 25° to the horizontal,what is the velocity after the stall?

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?

Karim rides his bike with velocity = ( 8.4 m/s,25° north of east)for 10 minutes.How far to the north of his starting position does Karim end up?

The components of a vector will be the same no matter what coordinate system is used to express that vector.

Vector points to the north and has length A.Vector points to the east and has length B = 2.5A.Find the direction of = 7.4 + .Express your answer as an angle relative to east.

A boy throws a rock with an initial velocity of 3.13 m/s at 30.0° above the horizontal.How long does it take for the rock to reach the maximum height of its trajectory?

The magnitude of the resultant of two vectors must be greater than or equal to the magnitude of each of these vectors.

A ball is thrown at an angle above the horizontal from the top of a cliff and feels no air resistance.A runner at the base of the cliff moves horizontally so that she is always under the ball.In this runner's reference frame,the path of the ball is a straight line rather than a parabola.

A boat crosses a river at a constant engine speed of 8.0 cm/s under the influence of a constant perpendicular current acceleration of 0.060 m/s2.How far off a straight course does it drift in 2.3 min?

To achieve maximum range of a projectile,for a fixed initial velocity,on Earth we must launch it at 45°.If we were at the moon should we do the same?

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

A football is kicked toward the goal posts and feels no air resistance.While it is in the air,the only force acting on it is 9.8 m/s2 downward due to gravity.

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?

You can launch a projectile with a fixed initial speed but at any angle above the horizontal,and it feels no air resistance.The time for it to return to the ground does not depend on the angle at which you launch it.

Representing Motion

Motion in One Dimension

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters

A plane flying at 70.0 m/s suddenly stalls.If the acceleration during the stall is 9.8 m/s² directly downward,the stall lasts 5.0 s,and the plane was originally climbing at 25° to the horizontal,what is the velocity after the stall?

A boat crosses a river at a constant engine speed of 8.0 cm/s under the influence of a constant perpendicular current acceleration of 0.060 m/s².How far off a straight course does it drift in 2.3 min?

A football is kicked toward the goal posts and feels no air resistance.While it is in the air,the only force acting on it is 9.8 m/s² downward due to gravity.