Question 1

A baseball is pitched,reaching the batter with a speed of 37 m/s and is hit such that it returns on the same line at 48 m/s.If the ball was in contact with the bat for 0.22 seconds,what was the average acceleration experienced by the ball during the time of contact?

Accepted Answer

A)  220 m/s2 
B)  41 m/s2 
C)  390 m/s2 
D)  170 m/s2

Question 2

The figure shows the graph of vx versus time for an object moving along the x-axis.What is the acceleration at t = 7.0 s?

Accepted Answer

A)  4.0 m/s2 
B)  5.0 m/s2 
C)  0.5 m/s2 
D)  0.4 m/s2

Question 3

A river flows toward the East at 2.2 m/s.Steve can swim 2.5 m/s in still water.If he wishes to cross the river so that his direction is northward,how long will it take him to cross the 75 m wide river?

Accepted Answer

A)  34 s 
B)  39 s 
C)  30 s 
D)  63 s

Question 4

An object starts from rest and moves with an acceleration of 2.0 m/s2 for 3.0 seconds.It then reduces its acceleration to 1.0 m/s2 for 5.0 additional seconds.The velocity 8 seconds from the start of the motion is

Accepted Answer

A)  51 m/s. 
B)  38 m/s. 
C)  11 m/s. 
D)  9.0 m/s. 
E)  7.6 m/s.

Question 5

An ant travels 30 cm east,25 cm north,and finally 15 cm west.What is the direction with respect to its starting point?

Accepted Answer

A)  59$^{\circ}$ N of E 
B)  77$^{\circ}$ N of E 
C)  29$^{\circ}$ N of E 
D)  59$^{\circ}$ N of W

Question 6

A runner starts from rest and with an acceleration of 1.0 m/s2 travels a distance of 10 meters.The time it takes the runner to cover the distance is

Accepted Answer

A)  6.3 s. 
B)  5.7 s. 
C)  5.0 s. 
D)  4.5 s. 
E)  3.8 s.

Question 7

The figure shows the speedometer readings as a car comes to a stop.Solve graphically for the acceleration at t = 7.0 s.

Accepted Answer

A)  2.5 m/s2 
B)  - 2.5 m/s2 
C)  - 2.0 m/s2 
D)  2.0 m/s2

Question 8

An airplane is flying in horizontal flight at a constant acceleration of 2.00 m/s2.The weight of the airplane is 40,000 N.The wings produce a lift force that is perpendicular to the wings and a drag force which is parallel to the wing is 2,000 N.The forward thrust force the engine produces is

Accepted Answer

A)  2,800 N. 
B)  4,000 N. 
C)  7,500 N. 
D)  8,000 N. 
E)  10,200 N.

Question 9

A river flows toward the East at 1.5 m/s.Steve can swim 2.2 m/s in still water.If he wishes to cross the river so that his direction is northward,what direction relative to the water must he swim?

Accepted Answer

A)  55$^{\circ}$ north of west 
B)  43$^{\circ}$ west of north 
C)  34$^{\circ}$ north of west 
D)  47$^{\circ}$ west of north

Question 10

An ant crawls in a straight line at a constant speed of 0.24 m/s for a distance of 3.0 m,beginning in the corner of a square classroom.It then turns exactly 90 degrees to the right,and proceeds an additional 4.0 m with a constant speed of 0.44 m/s,reaching the other corner of the same wall from which it began.What was the average speed for the full trip from corner to corner?

Accepted Answer

A)  0.34 m/s 
B)  0.30 m/s 
C)  0.21 m/s 
D)  0.23 m/s 
E)  0.32 m/s

Question 11

A model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s.What is the magnitude of the average acceleration during this time interval?

Accepted Answer

A)  0.37 m/s2 
B)  0.50 m/s2 
C)  0.62 m/s2 
D)  0.87 m/s2

Question 12

A car travels for 140 km at 70.0 km/hr.It then travels an additional distance of 60.0 km 40.0 km/hr.The average speed is

Accepted Answer

A)  61.0 km/hr. 
B)  57.1 km/hr. 
C)  53.3 km/hr. 
D)  46.7 km/hr. 
E)  45.0 km/hr.

Question 13

If an object is located 20 m to the right of the origin at 1:00 PM,and later the object is located 30 m to the left of the origin at 2:00 PM,then the displacement from 1:00 PM to 2:00 PM is

Accepted Answer

A)  50 m to the right. 
B)  50 m to the left. 
C)  30 m to the right. 
D)  30 m to the left. 
E)  10 m to the left.

Question 14

An object starts from rest with an acceleration of 2.0 m/s2 for 3.0 seconds.It then reduces its acceleration to 1.0 m/s2 for 5.0 additional seconds.The velocity at the end of the 5.0 seconds interval is

Accepted Answer

A)  6.0 m/s. 
B)  18. m/s. 
C)  8.0 m/s. 
D)  18 m/s. 
E)  11 m/s.

Question 15

The graph shows vx versus t for an object moving along straight line.What is the acceleration at t = 11 s?

Accepted Answer

A)  -10 m/s2 
B)  10 m/s2 
C)  22 m/s2 
D)  -22 m/s2

Question 16

A boat is traveling at 4.0 m/s as it passes the starting line of a race.If the boat accelerates at 2.0 m/s2 for 3.0 seconds,then the velocity the boat has after the 3.0 seconds is

Accepted Answer

A)  21 m/s. 
B)  9.0 m/s. 
C)  13 m/s. 
D)  10 m/s. 
E)  4.0 m/s.

Question 17

An object travels 7.5 m/s toward the West and under the influence of a constant net force of 5.2 kN,4.3 s later,it is travelling 2.5 m/s toward the East.What is its mass?

Accepted Answer

A)  2200 kg 
B)  4500 kg 
C)  6000 kg 
D)  12000 kg

Question 18

An ant crawls in a straight line at a constant speed of 0.24 m/s for a distance of 3.0 m,beginning in the corner of a square classroom.It then turns exactly 90 degrees to the right,and proceeds an additional 4.00 m,reaching the far corner of the same wall from which it began.If the second leg was also crawled in half the amount of time as required for the first leg,what was the ant's average speed for the whole trip?

Accepted Answer

A)  0.80 m/s 
B)  0.27 m/s 
C)  0.37 m/s 
D)  0.44 m/s

Question 19

The graph shows vx versus t for an object moving in a straight line.What is the average velocity from t = 0 s to t = 9 s?

Accepted Answer

A)  44 m/s2 
B)  32 m/s2 
C)  22 m/s2 
D)  24 m/s2

Question 20

In the figure,an airport luggage-carrying train with a tractor T is pulling three luggage carts,M1,M2,and M3 with an acceleration of 1.2 m/s2.If T = 300 kg,M1 = 200 kg,M2 = 100 kg,and M3 = 100 kg,then the force in the connection between cart M2 and cart M1 is

Accepted Answer

A)  840 N. 
B)  480 N. 
C)  240 N. 
D)  120 N. 
E)  0 N.

Exam 3: Acceleration and Newtons Second Law of Motion

A baseball is pitched,reaching the batter with a speed of 37 m/s and is hit such that it returns on the same line at 48 m/s.If the ball was in contact with the bat for 0.22 seconds,what was the average acceleration experienced by the ball during the time of contact?

The figure shows the graph of v_x versus time for an object moving along the x-axis.What is the acceleration at t = 7.0 s?

A river flows toward the East at 2.2 m/s.Steve can swim 2.5 m/s in still water.If he wishes to cross the river so that his direction is northward,how long will it take him to cross the 75 m wide river?

An object starts from rest and moves with an acceleration of 2.0 m/s² for 3.0 seconds.It then reduces its acceleration to 1.0 m/s² for 5.0 additional seconds.The velocity 8 seconds from the start of the motion is

An ant travels 30 cm east,25 cm north,and finally 15 cm west.What is the direction with respect to its starting point?

A runner starts from rest and with an acceleration of 1.0 m/s² travels a distance of 10 meters.The time it takes the runner to cover the distance is

The figure shows the speedometer readings as a car comes to a stop.Solve graphically for the acceleration at t = 7.0 s.

An airplane is flying in horizontal flight at a constant acceleration of 2.00 m/s².The weight of the airplane is 40,000 N.The wings produce a lift force that is perpendicular to the wings and a drag force which is parallel to the wing is 2,000 N.The forward thrust force the engine produces is

A river flows toward the East at 1.5 m/s.Steve can swim 2.2 m/s in still water.If he wishes to cross the river so that his direction is northward,what direction relative to the water must he swim?

A model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s.What is the magnitude of the average acceleration during this time interval?

A car travels for 140 km at 70.0 km/hr.It then travels an additional distance of 60.0 km 40.0 km/hr.The average speed is

If an object is located 20 m to the right of the origin at 1:00 PM,and later the object is located 30 m to the left of the origin at 2:00 PM,then the displacement from 1:00 PM to 2:00 PM is

An object starts from rest with an acceleration of 2.0 m/s² for 3.0 seconds.It then reduces its acceleration to 1.0 m/s² for 5.0 additional seconds.The velocity at the end of the 5.0 seconds interval is

The graph shows v_x versus t for an object moving along straight line.What is the acceleration at t = 11 s?

A boat is traveling at 4.0 m/s as it passes the starting line of a race.If the boat accelerates at 2.0 m/s² for 3.0 seconds,then the velocity the boat has after the 3.0 seconds is

An object travels 7.5 m/s toward the West and under the influence of a constant net force of 5.2 kN,4.3 s later,it is travelling 2.5 m/s toward the East.What is its mass?

The graph shows v_x versus t for an object moving in a straight line.What is the average velocity from t = 0 s to t = 9 s?

In the figure,an airport luggage-carrying train with a tractor T is pulling three luggage carts,M₁,M₂,and M₃ with an acceleration of 1.2 m/s².If T = 300 kg,M₁ = 200 kg,M₂ = 100 kg,and M₃ = 100 kg,then the force in the connection between cart M₂ and cart M₁ is