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You are driving a car on a country road when a mosquito splatters on the windshield. Which has the greater magnitude: the force that the car exerted on the mosquito or the force that the mosquito exerted on the car? Or are the magnitudes the same? If they are different, how can you reconcile this fact with Newton’s third law? If they are equal, why is the mosquito splattered while the car is undamaged?
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Chapter 4 Solutions
University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (14th Edition)
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- A ball is falling toward the ground. Which of the following statements are false? (a) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball, (b) The ball undergoes the same acceleration as Earth. (c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.arrow_forwardA ball is falling toward the ground. Which of the following statements are false? (a) The force that the ball exerts on Earth is equal in magnitude to the force that Earth exerts on the ball, (b) The ball undergoes the same acceleration as Earth. (c) The magnitude of the force the Earth exerts on the ball is greater than the magnitude of the force the ball exerts on the Earth.arrow_forwardAn object experiences no acceleration. Which of the following cannot be true for the object? (a) A single force acts on the object. (b) No forces act on the object. (c) Forces act on the object, but the forces cancel.arrow_forward
- A crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements must be true about the magnitude of the frictional force that acts on the crate? (a) It is larger than the weight of the crate. (b) It is at least equal to the weight of the crate. (c) It is equal to sn. (d) It is greater than the component of the gravitational force acting down the ramp. (e) It is equal to the component of the gravitational force acting down the ramp.arrow_forwardA large crate is suspended from the end of a vertical rope. Is the tension in the rope greater when the crate is at rest or when it is moving upward at constant speed? If the crate is traveling upward, is the tension in the rope greater when the crate is speeding up or when it is slowing down? In each case, explain in terms of Newton’s laws of motion.arrow_forwardA horizontal force of 25 N is required to push a wagon across a sidewalk at a constant speed. What is the net (unbalanced) force acting on the wagon? What is the value of the force of friction acting on the wagon? If the force on the wagon increased to 30 N, use Newton's law to explain what the effect would be.arrow_forward
- Newton's Second Law in 1 Dimension: A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope. (a) What is the magnitude of the force exerted by the rope on the crate? What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?arrow_forwardNewton's third law tells us that for every force in nature, there is an equal and opposite reaction force. In the previous question ("A crate is sitting at a top of a ramp, which is inclined at an angle"), what is the reaction force associated with the normal force acting on the box? O The weight force acting on the crate O The component of the weight force perpendicular to the surface O The normal force exerted by the crate on the ramp O The static friction force O Some other force O There is no reaction force to the normal forcearrow_forwardConsider applying Newton's second law to a man riding an elevator (perhaps to calculate his acceleration). Which of the following forces must be considered? Choose all that apply. The force that the man's head exerts on his neck. The force of gravity on the elevator. The force the elevator cable exerts on the elevator car. The force that the elevator floor exerts on the man's feet. The force that the man's feet exert on the floor of the elevator. The force of gravity on the man.arrow_forward
- A bug is splattered on the windshield of a car traveling along the highway. What does Newton’s third law say about the forces involved in the collision? Why is there such a drastic difference in effects to the bug and car?arrow_forwardA donkey is urged to pull a wagon. The donkey refuses, citing Newton's third law as a defence: the pull of the donkey on the wagon is equal to, but opposite the pull of the wagon on the donkey. The donkey asks, "If I can never exert a greater force on the wagon than it exerts on me, how can I ever start the wagon moving?" Reply to the donkey's objection and show why their claim is wrong. Hint: In your answer, make sure that the explanation is related to a physics principle covered in this unit.arrow_forwardA ball of mass 0.5 kg is tossed vertically upwards. What is the magnitude and direction of the net force acting on the ball, ( a ) as it moves upwards ? ( b ) as it moves downwards ? ( c ) at the highest point of its vertical climb. Do any of your answers change if the ball was kicked at a 45° angle with the horizontal plane? Ignore the air resistance.arrow_forward
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