College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Chapter 3, Problem 4RQ
Review Question 3.4 What is the main difference between inertial and noninertial reference frames? Give an example.
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An Australasian gannet (Morus serrator) can dive from a height of 20 metres into the sea to catch a fish. When is the gravitational force the greatest: when in level flight before the dive, during the dive, when entering the water, or some other? Briefly explain your answer. (Assume there is no air resistance)
Hint: In your answer, make sure that the explanation is related to a physics principle covered in this unit.
University Physics 1 - Newton's lawI need help with this problem and a very detailed explanation of the solutions described below:
Should the tension in the string be less than, greater than, or equal to the gravitational force acting on M2.? Explain your answer conceptually, meaning without any equations or numbers.
The tension in the string should be less than gravitational force acting on M2
Because?
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Chapter 3 Solutions
College Physics
Ch. 3 - Review Question 3.1 How do we determine how many...Ch. 3 - Review Question 3.2 A book bag hanging from a...Ch. 3 - Review Question 3.3 An elevator in a tall office...Ch. 3 - Review Question 3.4 What is the main difference...Ch. 3 - Review Question 3.5 Your friend says that m is a...Ch. 3 - Review Question 3.6 Newton’s second law says that...Ch. 3 - Review Question 3.7 Three friends argue about the...Ch. 3 - Review Question 3.8 Is the following sentence...Ch. 3 - Review Question 3.9 Explain how an air bag and...Ch. 3 - An upward-moving elevator slows to a stop as it...
Ch. 3 - You apply the brakes of your car abruptly and your...Ch. 3 - Which of the statements below explains why a child...Ch. 3 - Which observers can explain the phenomenon of...Ch. 3 - 5. Which vector quantities describing a moving...Ch. 3 - You have probably observed that magnets attract...Ch. 3 - Which of the following velocity-versus-time graphs...Ch. 3 - A book sits on a tabletop. What force is the...Ch. 3 - 9. A spaceship moves in outer space. What happens...Ch. 3 - 10. A 0.10-kg apple falls on Earth, whose mass is...Ch. 3 - 11. A man stands on a scale and holds a heavy...Ch. 3 - You stand on a bathroom scale in a moving...Ch. 3 - A person pushes a 10-kg crate, exerting a 200-N...Ch. 3 - Two small balls of the same material, one of mass...Ch. 3 - 15. A box full of lead and a box of the same size...Ch. 3 -
16. Figure Q3.16 shows an unlabeled force...Ch. 3 - A person jumps from a wall and lands stiff-legged....Ch. 3 - A 3000-kg spaceship is moving away from a space...Ch. 3 - Figure Q3.19 is a velocity-versus-time graph for...Ch. 3 - 20. Explain the purpose of crumple zones, that is,...Ch. 3 - 21. Explain why when landing on a firm surface...Ch. 3 - A small car bumps into a large truck. Compare the...Ch. 3 - 23. You are pulling a sled. Compare the forces...Ch. 3 - 25. You are holding a 100-g apple. (a) What is the...Ch. 3 - 26. You throw a 100-g apple upward. (a) While the...Ch. 3 - After having been thrown upward, a 100-g apple...Ch. 3 - * In Figure P3.1 you see unlabeled force diagrams...Ch. 3 - 2. Draw a force diagram (a) for a bag hanging at...Ch. 3 - 3. For each of the following situations, draw the...Ch. 3 - 4. You hang a book bag on a spring scale and place...Ch. 3 - 5. A block of dry ice slides at constant velocity...Ch. 3 - 6. * You throw a ball upward. (a) Draw a motion...Ch. 3 - 7. A string pulls horizontally on a cart so that...Ch. 3 - 8. * Solving the previous problem, your friend...Ch. 3 - 9. * A string pulls horizontally on a cart so that...Ch. 3 - A block of dry ice slides at a constant velocity...Ch. 3 - 11 .Three motion diagrams for a moving elevator...Ch. 3 - 12. * A student holds a thin aluminum pie pan...Ch. 3 - * Figures P3.11a b, and c show three motion...Ch. 3 - 14. * A train traveling from New York to...Ch. 3 - *Explain the phenomenon of whiplash from two...Ch. 3 - An astronaut exerts a 100-N force pushing a beam...Ch. 3 - 17. Four people participate in a rope competition....Ch. 3 - 18. * Shot put throw During a practice shot put...Ch. 3 - * You know the sum of the forces F exerted on an...Ch. 3 - * You record the displacement of an object as a...Ch. 3 - 25. * Spider-Man Spider-Man holds the bottom of an...Ch. 3 - ** Matt is wearing Rollerblades. Beth pushes him...Ch. 3 - 27. * Stuntwoman The downward acceleration of a...Ch. 3 - EST Estimate the average force that a baseball...Ch. 3 - * Super Hornet jet takeoff A2.1104-kgF-18 Super...Ch. 3 - Lunar Lander The Lunar Lander of mass 2.01024 kg...Ch. 3 - 31. Aisha throws a ball upward Frances, standing...Ch. 3 - Students Lucia. Isabel, and Austin are...Ch. 3 - 33. * Astronaut Karen Nyberg, a 60-kg astronaut,...Ch. 3 - * A 0.10-kg apple falls off a tree branch that is...Ch. 3 - 35. ** An 80-kg fireman slides 5.0 m down a fire...Ch. 3 - * Earth exerts a 1.0-N gravitational force on an...Ch. 3 - * You push a bowling ball down the lane toward the...Ch. 3 - 38. * EST (a) A 50-kg skater initially at rest...Ch. 3 - 39. ** EST Basketball player LeBron James can jump...Ch. 3 - * EST The Scottish Tug of War Association contests...Ch. 3 - Consider the experiment described in Question 3.6...Ch. 3 - 42. * EST A friend drops a 0.625-kg basketball...Ch. 3 - 43 Car safety The National Transportation Safety...Ch. 3 - 44. * A 70-kg person in a moving car stops during...Ch. 3 - BIOESTLeft ventricle pumpingThe lower left chamber...Ch. 3 - Prob. 46GPCh. 3 - 47. ** EST Olympic dive During a practice dive,...Ch. 3 - 49. ** EST You are doing squats on a bathroom...Ch. 3 - ** EST Estimate the horizontal speed of the runner...Ch. 3 - 51. ** EST Estimate the maximum acceleration of...Ch. 3 - ** EST Estimate how much Earth would move during...Ch. 3 - In an early practice run while the rocket sled was...Ch. 3 - What is Stapps67m/sspeed in miles per hour? 30mi/h...Ch. 3 - 55. What is the magnitude of the acceleration of...Ch. 3 - 56. What is the magnitude of the acceleration of...Ch. 3 - What is the average force exerted by the...Ch. 3 - 58. What is the time interval for Stapp and his...Ch. 3 - Using proportions A proportion is defined as an...Ch. 3 - Using proportions A proportion is defined as an...Ch. 3 - Using proportions A proportion is defined as an...Ch. 3 - Using proportions A proportion is defined as an...Ch. 3 - Using proportions A proportion is defined as an...
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- The observer in the accelerating elevator of Example 5.8 would claim that the weight of the fish is T, the scale reading, but this answer is obviously wrong. Why does this observation differ from that of a person outside the elevator, at rest with respect to the Earth?arrow_forwardUnreasonable Result A mountain 10.0 km from a person exerts a gravitational force on him equal to 2.00% of his weight. (a) Calculate the mass of the mountain. (b) Compare the mountain's mass with that of Earth. (c) What is unreasonable about these results? (d) Which premises are unreasonable or inconsistent? (Note that accurate gravitational measurements can easily detect the effect of nearby mountains and variations in local geology.)arrow_forwardIt is said that Newtons first law can be derived from his second law. Explain this statement.arrow_forward
- Review. The gravitational force exerted on a baseball is 2.21 N down. A pitcher throws the ball horizontally with velocity 18.0 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 170 ms. The ball starts from rest, (a) Through what distance does it move before its release? (b) What are the magnitude and direction of the force the pitcher exerts on the hall?arrow_forwardA child jumping off the monkey bars at a playground accelerates toward the ground because of the gravitational force exerted on him by the Earth. From Newtons third law, the force exerted by the Earth on the child is equal in magnitude to the force exerted by the child on the Earth. Does the Earth accelerate? Explain.arrow_forwardA car moves at speed v across a bridge made in the shape of a circular arc of radius r. (a) Find an expression for the normal force acting on the car when it is at the top of the arc. (b) At what minimum speed will the normal force become zero (causing the occupants of the car to seem weightless) if r = 30.0 m?arrow_forward
- A flea jumps by exerting a force of 1.20105 N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of 0.500106 N on the flea. Find the direction and magnitude of the acceleration of the flea if its mass is 6.00107 kg. Do not neglect the gravitational force.arrow_forwardTwo ocean liners, each with a mass of 40 000 metric tons, are moving on parallel courses 100 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attraction? Model the ships as particles.arrow_forwardYou are riding a luxury bus. In front of you is a cup of tea resting on the seat-back tray. Which of the following events may lead to spilled tea in your lap? The bus a. remains at rest, b. moves at constant velocity, c. speeds up or d. slows down. Dont worry about other circumstances such as a person knocking your cup over. (More than one choice may be correct.) Explain your answers.arrow_forward
- A person stands on a spring scale in an elevator car as shown in Figure 5.5. Which of these sourcesthe Earth, spring scale, elevator car. and cableexert an external force if the system consists of: a. Only the person? b. The person and the spring scale? c. The person, the spring scale, and the elevator car? FIGURE 5.5arrow_forwardIntegrated Concepts A basketball player jumps straight up for a ball. To do this, he lowers his body 0.300 m and then accelerates through this distance by forcefully straightening his legs. This player leaves the floor with a vertical velocity sufficient to carry him 0.900 m above the floor. (a) Calculate his velocity when he leaves the floor. (b) Calculate his acceleration while he is straightening his legs. He goes from zero to the velocity found in part (a) in a distance of 0.300 m. (c) Calculate the force he exerts on the floor to do this, given that his mass is 110 kg.arrow_forwardA dockworker loading crates on a ship finds that a 20.0-kg crate, initially at rest on a horizontal surface, requires a 75.0-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60.0 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.arrow_forward
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