Physics: Principles & Problems 9th Edition solutions

Physics: Principles & Problems 9
Motion Diagram of a Runner Use the particle model to draw a motion diagram for a bike rider riding at a constant pace

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9
Critical Thinking Use the particle model to draw motion diagrams for two runners in a race, when the first runner crosses the finish line as the other runner is three-fourths of the way to the finish line.

Physics: Principles & Problems 9
Displacement The particle model for a car traveling on an interstate highway is shown below. The starting point is shown. Here There Make a copy of the particle model, and draw a vector to represent the displacement of the car from the starting time to the end of the third time interval

Physics: Principles & Problems 9
Displacement The particle model for a boy walking to school is shown below. Home School Make a copy of the particle model, and draw vectors to represent the displacement between each pair of dots.

Physics: Principles & Problems 9
Position Two students compared the position vectors they each had drawn on a motion diagram to show the position of a moving object at the same time. They found that their vectors did not point in the same direction. Explain

Physics: Principles & Problems 9
Critical Thinking A car travels straight along the street from the grocery store to the post office. To represent its motion you use a coordinate system with its origin at the grocery store and the direction the car is moving in as the positive direction. Your friend uses a coordinate system with its

Physics: Principles & Problems 9
Describe the motion of the car shown by the graph.

Physics: Principles & Problems 9
Draw a motion diagram that corresponds to the graph.

Physics: Principles & Problems 9
. Answer the following questions about the cars motion. Assume that the positive d-direction is east and the negative d-direction is west. a. When was the car 25.0 m east of the origin? b. Where was the car at 1.0 s?

Physics: Principles & Problems 9
Describe, in words, the motion of the two pedestrians shown by the lines in Figure 2-14. Assume that the positive direction is east on Broad Street and the origin is the intersection of Broad and High Streets.

Physics: Principles & Problems 9
3. Odina walked down the hall at school from the cafeteria to the band room, a distance of 100.0 m. A class of physics students recorded and graphed her position every 2.0 s, noting that she moved 2.6 m every 2.0 s. When was Odina in the following positions? a. 25.0 m from the cafeteria b. 25.0 m fro

Physics: Principles & Problems 9
What event occurred at t ! 0.0 s?

Physics: Principles & Problems 9
Which runner was ahead at t ! 48.0 s?

Physics: Principles & Problems 9
. When runner A was at 0.0 m, where was runner B?

Physics: Principles & Problems 9
How far apart were runners A and B at t ! 20.0 s?

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9
Time Use the position-time graph of the hockey puck to determine when it was 10.0 m beyond the origin.

Physics: Principles & Problems 9
Distance Use the position-time graph of the hockey puck to determine how far it moved between 0.0 s and 5.0 s

Physics: Principles & Problems 9
Time Interval Use the position-time graph for the hockey puck to determine how much time it took for the puck to go from 40 m beyond the origin to 80 m beyond the origin.

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9
. Describe, in words, the motion of the cruise ship in the previous problem

Physics: Principles & Problems 9

Physics: Principles & Problems 9
8. When Marilyn takes her pet dog for a walk, the dog walks at a very consistent pace of 0.55 m/s. Draw a motion diagram and position-time graph to represent Marilyns dog walking the 19.8-m distance from in front of her house to the nearest fire hydrant

Physics: Principles & Problems 9

Physics: Principles & Problems 9
. Average Velocity Rank the graphs according to average velocity, from greatest average velocity to least average velocity. Specifically indicate any ties

Physics: Principles & Problems 9
Initial Position Rank the graphs according to the objects initial position, from most positive position to most negative position. Specifically indicate any ties. Would your ranking be different if you had been asked to do the ranking according to initial distance from the origin?

Physics: Principles & Problems 9
Average Speed and Average Velocity Explain how average speed and average velocity are related to each other

Physics: Principles & Problems 9
Critical Thinking In solving a physics problem, why is it important to create pictorial and physical models before trying to solve an equation?

Physics: Principles & Problems 9

Physics: Principles & Problems 9
What is the purpose of drawing a motion diagram?

Physics: Principles & Problems 9
Under what circumstances is it legitimate to treat an object as a point particle?

Physics: Principles & Problems 9
The following quantities describe location or its change: position, distance, and displacement. Briefly describe the differences among them.

Physics: Principles & Problems 9
. How can you use a clock to find a time interval?

Physics: Principles & Problems 9
In-line Skating How can you use the position-time graphs for two in-line skaters to determine if and when one in-line skater will pass the other one?

Physics: Principles & Problems 9
Walking Versus Running A walker and a runner leave your front door at the same time. They move in the same direction at different constant velocities. Describe the position-time graphs of each.

Physics: Principles & Problems 9
What does the slope of a position-time graph measure?

Physics: Principles & Problems 9
If you know the positions of a moving object at two points along its path, and you also know the time it took for the object to get from one point to the other, can you determine the particles instantaneous velocity? Its average velocity? Explain.

Physics: Principles & Problems 9
Test the following combinations and explain why each does not have the properties needed to describe the concept of velocity: !d " !t, !d # !t, !d $ !t, !t/!d

Physics: Principles & Problems 9
Football When can a football be considered a point particle?

Physics: Principles & Problems 9
. When can a football player be treated as a point particle?

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9
A bike travels at a constant speed of 4.0 m/s for 5.0 s. How far does it go?

Physics: Principles & Problems 9
. Astronomy Light from the Sun reaches Earth in 8.3 min. The speed of light is 3.00!108 m/s. How far is Earth from the Sun?

Physics: Principles & Problems 9
. A car is moving down a street at 55 km/h. A child suddenly runs into the street. If it takes the driver 0.75 s to react and apply the brakes, how many meters will the car have moved before it begins to slow down?

Physics: Principles & Problems 9
Nora jogs several times a week and always keeps track of how much time she runs each time she goes out. One day she forgets to take her stopwatch with her and wonders if theres a way she can still have some idea of her time. As she passes a particular bank, she remembers that it is 4.3 km from her ho

Physics: Principles & Problems 9
Driving You and a friend each drive 50.0 km. You travel at 90.0 km/h; your friend travels at 95.0 km/h. How long will your friend have to wait for you at the end of the trip?

Physics: Principles & Problems 9
Cycling A cyclist maintains a constant velocity of "5.0 m/s. At time t # 0.0 s, the cyclist is "250 m from point A. a. Plot a position-time graph of the cyclists location from point A at 10.0-s intervals for 60.0 s. b. What is the cyclists position from point A at 60.0 s? c. What is the displacement

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9
Driving Both car A and car B leave school when a stopwatch reads zero. Car A travels at a constant 75 km/h, and car B travels at a constant 85 km/h. a. Draw a position-time graph showing the motion of both cars. How far are the two cars from school when the stopwatch reads 2.0 h? Calculate the distan

Physics: Principles & Problems 9
Draw a position-time graph for two cars traveling to the beach, which is 50 km from school. At noon, Car A leaves a store that is 10 km closer to the beach than the school is and moves at 40 km/h. Car B starts from school at 12:30 P.M. and moves at 100 km/h. When does each car get to the beach

Physics: Principles & Problems 9
Two cars travel along a straight road. When a stopwatch reads t # 0.00 h, car A is at dA # 48.0 km moving at a constant 36.0 km/h. Later, when the watch reads t # 0.50 h, car B is at dB # 0.00 km moving at 48.0 km/h. Answer the following questions, first, graphically by creating a positiontime graph,

Physics: Principles & Problems 9

Physics: Principles & Problems 9

Physics: Principles & Problems 9
Apply Concepts You plan a car trip for which you want to average 90 km/h. You cover the first half of the distance at an average speed of only 48 km/h. What must your average speed be in the second half of the trip to meet your goal? Is this reasonable? Note that the velocities are based on half the

Physics: Principles & Problems 9
Design an Experiment Every time a particular red motorcycle is driven past your friends home, his father becomes angry because he thinks the motorcycle is going too fast for the posted 25 mph (40 km/h) speed limit. Describe a simple experiment you could do to determine whether or not the motorcycle i

Physics: Principles & Problems 9
Interpret Graphs Is it possible for an objects position-time graph to be a horizontal line? A vertical line? If you answer yes to either situation, describe the associated motion in words.

Physics: Principles & Problems 9
Physicists have determined that the speed of light is 3.00!108 m/s. How did they arrive at this number? Read about some of the series of experiments that were done to determine lights speed. Describe how the experimental techniques improved to make the results of the experiments more accurate.

Physics: Principles & Problems 9
Some species of animals have good endurance, while others have the ability to move very quickly, but for only a short amount of time. Use reference sources to find two examples of each quality and describe how it is helpful to that animal

Physics: Principles & Problems 9
Convert each of the following time measurements to its equivalent in seconds. (Chapter 1) a. 58 ns c. 9270 ms b. 0.046 Gs d. 12.3 ks

Physics: Principles & Problems 9
State the number of significant digits in the following measurements. (Chapter 1) a. 3218 kg c. 801 kg b. 60.080 kg d. 0.000534 kg

Physics: Principles & Problems 9
Using a calculator, Chris obtained the following results. Rewrite the answer to each operation using the correct number of significant digits. (Chapter 1) a. 5.32 mm " 2.1 mm # 7.4200000 mm b. 13.597 m ! 3.65 m # 49.62905 m2 c. 83.2 kg $ 12.804 kg # 70.3960000 kg