1. As a baseball is being thrown, it goes from 0.0 to 40.0 m/s in 0.26 s.
(a) What is the acceleration of the baseball?
(b) What is the acceleration in g's?
2. A rock is dropped off the side of a bridge and hits the water below 7.9 s later.
(a) What was the rock's velocity when it hit the water?
(b) What was the rock's average velocity as it fell?
(c) What is the height of the bridge above the water?
3. A high-performance sports car can go from 0 to 100 mph in 9.4 s. (Assume the car travels in the positive direction. Indicate the direction with the sign of your answer.)
(a) What is the car's average acceleration (in SI units; meter-kilogram-second)?
(b) The same car can come to a complete stop from 26 m/s in 5.1 s. What is its average acceleration?
4. A passenger jet flies from one airport to another 1,353 miles away in 3.0 h. Find its average speed in the mks system of units.
5. What are the "basic" or "fundamental" physical quantities? (Select all that apply.)
mass
distance
speed
area
time
Why are they called that?
6. List the physical quantities identified in this chapter. From which of the fundamental physical quantities is each derived? Which of them are vectors, and which are scalars?
7. What is the distinction between speed and velocity? Describe a situation in which an object's speed is constant but its velocity is not.
8. What does the slope of a distance-versus-time graph represent physically?
acceleration
velocity
time
area
displacement