Question

What are the Solutions to Part B of Chapter 2 of Tillery Physics 9th edition.......kinda pointless for you guys to only have the solutions that the book has already.

1. What was the average speed in km/h of a car that travels 400.0 km in 4.5 h?

2. What was the average speed in km/h of a boat that moves 15.0 km across a lake in 45 min?

3. How much would a 80.0 kg person weigh (a) on Mars, where the acceleration of gravity is 3.93 m/s2 , and (b) on Earth’s Moon, where the acceleration of gravity is 1.63 m/s2 ?

4. What force is needed to give a 6,000 kg truck an acceleration of 2.2 m/s2 over a level road?

5. What is the resulting acceleration when a 300 N force acts on an object with a mass of 3,000 kg?

6. A boat moves 15.0 km across a lake in 30.0 min. What was the average speed of the boat in kilometers per hour?

7. If the Sun is a distance of 1.5 × 108 km from Earth, how long does it take sunlight to reach Earth if light moves at 3.0 × 108 m/s?

8. How many meters away is a cliff if an echo is heard 0.500 s aft er the original sound? Assume that sound traveled at 343 m/s on that day.

9. A car has an average speed of 80.0 km/h for 1 hour, then an average speed of 90.0 km/h for 2 hours during a 3 hour trip. What was the average speed for the 3 hour trip?

10. What is the acceleration of a car that moves from a speed of 5.0 m/s to a speed of 15 m/s during a time of 6.0 s?

11. How much time is needed for a car to accelerate from 8.0 m/s to a speed of 22 m/s if the acceleration is 3.0 m/s2 ?

12. A rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 380,000 km?

13. Sound travels at 348 m/s in the warm air surrounding a thunderstorm. How far away was the place of discharge if thunder is heard 4.63 s aft er a lightning fl ash?

14. How many hours are required for a radio signal from a space probe near the dwarf planet Pluto, 6.00 × 109 km away, to reach Earth? Assume that the radio signal travels at the speed of light, 3.00 × 108 m/s.

15. A rifl e is fi red straight up, and the bullet leaves the rifl e with an initial velocity magnitude of 724 m/s. Aft er 5.00 s, the velocity is 675 m/s. At what rate is the bullet decelerated?

16. A rock thrown straight up climbs for 2.50 s, then falls to the ground. Neglecting air resistance, with what velocity did the rock strike the ground?

17. An object is observed to fall from a bridge, striking the water below 2.50 s later. (a) With what velocity did it strike the water? (b) What was its average velocity during the fall? (c) How high is the bridge?

18. A ball dropped from a window strikes the ground 2.00 s later. How high is the window above the ground?

19. Find the resulting acceleration from a 300 N force that acts on an object with a mass of 3,000 kg.

20. What is the momentum of a 30.0 kg shell fi red from a cannon with a velocity of 500 m/s?

21. What is the momentum of a 39.2 N bowling ball with a velocity of 7.00 m/s?

22. A 30.0 kg shell is fi red from a 2,000 kg cannon with a velocity of 500 m/s. What is the resulting velocity of the cannon?

23. An 80.0 kg man is standing on a frictionless ice surface when he throws a 2.00 kg book at 10.0 m/s. With what velocity does the man move across the ice?

24. (a) What is the weight of a 5.00 kg backpack? (b) What is the acceleration of the backpack if a net force of 10.0 N is applied?

25. What net force is required to accelerate a 20.0 kg object to 10.0 m/s2 ?

26. What forward force must the ground apply to the foot of a 60.0 kg person to result in an acceleration of 1.00 m/s2 ?

27. A 1,000.0 kg car accelerates uniformly to double its speed from 36.0 km/h in 5.00 s. What net force acted on this car?

28. A net force of 3,000.0 N accelerates a car from rest to 36.0 km/h in 5.00 s. (a) What is the mass of the car? (b) What is the weight of the car?

29. How much does a 60.0 kg person weigh?

30. What tension must a 50.0 cm length of string support in order to whirl an attached 1,000.0 g stone in a circular path at 5.00 m/s?

31. A 200.0 kg astronaut and equipment move with a velocity of 2.00 m/s toward an orbiting spacecraft . How long must the astronaut fi re a 100.0 N rocket backpack to stop the motion relative to the spacecraft ?

Answer 1