CONCEPTUAL PHYSICS-W/PRACTICING PHYSICS
9th Edition
ISBN: 9780321052025
Author: Hewitt
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 38A
A speeding bus makes contact with a bug that splatters onto the windshield. Because Of the sudden force, the unfortunate bug undergoes a sudden deceleration. Is the corresponding force that the bug exerts against the windshield greater, less, or the same? Is the resulting deceleration of the bus greater than, less than, or the same as that of the bug?
Expert Solution & Answer
Solution
To identify: Whether the corresponding force is that the bug exerts against the windshield is greater, less or same. Also, whether the resultant deceleration of bus is greater, less or same as that of bus.
Introduction:
Single force not exist. It appears in pair. According to Newton's thirds law for every force there is equal and opposite force. Bug hits the speeding bus is an example of Newton's third law of motion.
Explanation:
Bug collide with the wind shield of a speeding bus. This is action force and wind shield exerts opposite force on the bug. Both forces are equal and opposite. The deceleration of bus is small as compared to the bug since bus mass is very large compared to bug.
By Newton’s second law of motion acceleration of an object is inversely proportional to mass for constant force. The declaration of bug is large as it has small mass and declaration of bus is less than bug.
Conclusion:
The force exerted by the bug is same but in opposite direction and the deceleration of the bus is small due to large mass of the bus as compared to bug.
Chapter 7 Solutions
CONCEPTUAL PHYSICS-W/PRACTICING PHYSICS
Ch. 7 - Can an action force exist without a reaction...Ch. 7 - When a hammer exerts a force on a nail, how does...Ch. 7 - When you walk on a floor, what pushes you along?Ch. 7 - State Newtons third law of motion.Ch. 7 - Consider hitting a baseball with a bat. If we call...Ch. 7 - If a bat hits a ball with 1000 N of force, can the...Ch. 7 - If the world pulls you downward against your...Ch. 7 - When a cannon is fired, are the forces on the...Ch. 7 - When a cannon is fired, why do the cannon-ball and...Ch. 7 - Identify the force that propels a rocket.
Ch. 7 - How does a helicopter get its lifting force?Ch. 7 - True or false: When a net force is exerted on a...Ch. 7 - When can two kicks on a soccer ball produce a net...Ch. 7 - Prob. 14ACh. 7 - Referring to Figure 7.14, how many horizontal...Ch. 7 - How many horizontal forces are exerted on the...Ch. 7 - How many horizontal forces are exerted on the...Ch. 7 - If you hit a wall with a force of 200 N, how much...Ch. 7 - Can you physically touch another person without...Ch. 7 - Fill in the blanks: Newtons first law is often...Ch. 7 - Three sets of double boxes rest on a table. Rank...Ch. 7 - A van exerts a force on trailers of different...Ch. 7 - Each of these boxes is pulled by the same force F...Ch. 7 - Prob. 24ACh. 7 - Your weight is the result of the gravitational...Ch. 7 - Why can you exert greater force on the pedals of a...Ch. 7 - Consider the two forces acting on a person who...Ch. 7 - If you walk on a log that is floating in the...Ch. 7 - Why is it easier to walk on a carpeted floor than...Ch. 7 - If you step off a ledge, you accelerate noticeably...Ch. 7 - When a racquet hits a tennis ball, action and...Ch. 7 - Suppose you're weighing yourself while standing...Ch. 7 - When a high jumper leaves the ground, what is the...Ch. 7 - What is the reaction force to an action force of...Ch. 7 - If action equals reaction, why isnt Earth pulled...Ch. 7 - A small car bumps into a van at rest in a parking...Ch. 7 - Does your answer to question 36 depend on the...Ch. 7 - A speeding bus makes contact with a bug that...Ch. 7 - Consider two carts, one twice as massive as the...Ch. 7 - Some people used to think that a rocket could not...Ch. 7 - Since the force that acts on a cannonball when a...Ch. 7 - Suppose you exert 200 N on your refrigerator and...Ch. 7 - The photo shows Steve Hewitt and his daughter...Ch. 7 - Hold your hand like a flat wing outside the window...Ch. 7 - Your teacher challenges you and your best friend...Ch. 7 - A pair of 50-N weights are attached to a spring...Ch. 7 - The strong man can withstand the tension force...Ch. 7 - A balloon floats motionless in the air. A...Ch. 7 - When you get up from a sitting position, do your...Ch. 7 - When a weightlifter jerks a barbell over his head,...Ch. 7 - Identify two pairs of action-reaction forces that...Ch. 7 - A car of mass m cruises along the highway at a...Ch. 7 - What will be the acceleration of recoil when a...Ch. 7 - Two people attempt a tug-of-war on low-friction...Ch. 7 - Two blocks, one three times as massive as the...Ch. 7 - What is the net force on a falling 100-N barrel...Ch. 7 - Amanda looks at a 1.0-kg bag of jellybeans resting...Ch. 7 - When 56-kg Diane on rollerskates pushes against a...Ch. 7 - A 7.00-kg bowling ball moving at 8.0 m/s strikes a...Ch. 7 - A 70-kg skydiver is falling at her terminal speed....Ch. 7 - Gymnast Gracie of weight mg is suspended by a pair...
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