Exam 2: Kinematics: Description of Motion

A bat, flying due east at 2 m/s, emits a shriek that is reflected back to it from an oncoming insect flying directly toward the bat at 4 m/s. The insect is 20 m from the bat at the instant the shriek is emitted. Sound travels 340 m/s in air. After what elapsed time does the bat hear the reflected echo?

Use the Figure 2-14 below to answer the following question(s). -During the first 8 s

A bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10 cm. (a) What is the average acceleration of the bullet? (b) How long does it take to come to rest?

"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)

A car was moving 110. km/hour. (a) How long did it take to go 25.5 miles? (b) If it stopped in 35. s, what was its average acceleration (m/s²) as it slowed down?

The slope of a line connecting two points on a position versus time graph gives

All of the following are vectors, except

An object moving under the influence of only gravity is said to be in ________ ________.

A race car circles 10 times around an 8-km track in 20 min. What is its average speed per lap?

Which of the following can never be negative?

Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?

Speed is to velocity as distance is to ________.

-Figure 2-15 shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path. Find the net displacement of the player for the 10 s shown on the graph.

The graph in Figure 2-5 plots the velocity of two cars (A and B) along the same straight road. Figure 2-5 During the time interval shown, which car is AHEAD?

A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?

For this problem, assume that the acceleration of gravity is 10 m/s² downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?

A negative velocity, approaching zero, represents a negative acceleration.

Use the Figure 2-12 below to answer the following question(s). -At t = 1 s

Use the Figure 2-14 below to answer the following question(s). -Based on all the graphical information

A scalar quantity is described by both a magnitude and a direction.