FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 2: Kinematics in One Dimension

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 51

Multiple Choice

Review LaterAdd Note

Review Later

A racecar, traveling at constant speed, makes one lap around a circular track of radius r in a time t.Note: The circumference of a circle is given by C = 2 $\pi$ r. -An elevator is moving upward with a speed of 11 m/s.Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s.What is the average acceleration of the elevator during the 3.0 s interval?

A) 2.0 m/s², upward
B) 2.0 m/s², downward
C) 5.3 m/s², upward
D) 5.3 m/s², downward
E) 2.7 m/s², downward

Correct Answer

verified

Show Answer

Question 52

Multiple Choice

Review LaterAdd Note

Review Later

A car starts from rest and accelerates at a constant rate in a straight line.In the first second the car moves a distance of 2.0 meters.How fast will the car be moving at the end of the second second?

A) 4.0 m/s
B) 16 m/s
C) 2.0 m/s
D) 32 m/s
E) 8.0 m/s

Correct Answer

verified

Show Answer

Question 53

Multiple Choice

Review LaterAdd Note

During the first 18 minutes of a 1.0-hour trip, a car has an average speed of 11 m/s.What must the average speed of the car be during the last 42 minutes of the trip be if the car is to have an average speed of 21 m/s for the entire trip?

The graph shows the height versus time of an object.Estimate the instantaneous velocity, in m/s, of the object at time t = 15 min.

2-4 A ball is shot straight up from the surface of the earth with an initial speed of 19.6 m/s. Neglect any effects due to air resistance. -What is the magnitude of the ball's displacement from the starting point after 1.00 second has elapsed?

Neglecting air resistance, what maximum height will be reached by an arrow launched straight upward with an initial speed of 35 m/s?

What is the acceleration of the object in the interval from t = 5 s to t = 6 s?

2-9 An object is moving along a straight line in the positive x direction.The graph shows its position from the starting point as a function of time.Various segments of the graph are identified by the letters A, B, C, and D. -Which segment(s) of the graph represent(s) a constant velocity of +1.0 m/s?

Which one of the following is not a vector quantity?

2-15 The figure shows the speed as a function of time for an object in free fall near the surface of the earth. The object was dropped from rest in a long evacuated cylinder. -If the same object were released in air, the magnitude of its acceleration would begin at the free-fall value, but it would decrease continuously to zero as the object continued to fall.For which one of the choices given does the solid line best represent the speed of the object as a function of time when it is dropped from rest in air? Note: The dashed line shows the free-fall under vacuum graph for comparison.

2-10 A automotive test driver travels due north in a prototype hybrid vehicle at 30 mi/h for 2 hours.She then reverses her direction and travels due south at 60 mi/h for 1 hour. -What is the average velocity of the vehicle?

Starting from rest, a particle confined to move along a straight line is accelerated at a rate of 5.0 m/s².Which one of the following statements accurately describes the motion of this particle?

Which one of the physical quantities listed below is not correctly paired with its SI unit and dimension?

2-12 A rock, dropped from rest near the surface of an atmosphere-free planet, attains a speed of 20.0 m/s after falling 8.0 meters. -What is the magnitude of the acceleration due to gravity on the surface of this planet?

2-6 An object is moving along the x axis.The graph shows its position from the starting point as a function of time.Various segments of the graph are identified by the letters A, B, C, and D. -What is the acceleration of the object at t = 7.0 s?

2-6 An object is moving along the x axis.The graph shows its position from the starting point as a function of time.Various segments of the graph are identified by the letters A, B, C, and D. -What is the velocity of the object at t = 7.0 s?

Which one of the following statements must be true if the expression is to be used?

A hammer is accidentally dropped from rest down a vertical mine shaft.How long does it take for the rock to reach a depth of 79 m? Neglect air resistance.

Determine the velocity of the ball at t = 3.00 seconds.

A Canadian goose flew 845 km from Southern California to Oregon with an average speed of 28.0 m/s.How long, in hours, did it take the goose to make this journey?