# HW Ch5 - HW Ch 5Force and Newton's Laws Chapter 5 Force and...

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HW Ch. 5 Force and Newton's Laws Chapter 5: Force and Newton's Laws Conceptual problems 5.C.1 2 (5.00) One end of a spring is attached firmly to a wall, and a block is attached to the other end. When the spring is fully compressed, it exerts a force F on the block, and when the spring is fully extended, the force it exerts on the block is − F . What is the force of the spring on the block at (a) equilibrium (neither compressed nor stretched), (b) halfway between maximum stretch and equilibrium, and (c) halfway between maximum compression and equilibrium? Carefully consider the signs in your answer, which indicate direction, and express your answers in terms of F . (a) F-F0-F/2F/2 (0/2 submissions used) (b) F-F0-F/2F/2 (0/2 submissions used) (c) F-F0-F/2F/2 (0/2 submissions used) Section 0: Introduction 5.0.1 (5.00) Use the simulation in the interactive problem in Section 5.0 to answer the following question. If the net force on the helicopter is zero, what must the helicopter be doing? Rising Falling Staying still can be doing any of these (0/2 submissions used) Section 4: Gravitational force: weight 5.4.3 (5.00) A dog weighs 47.0 pounds on Earth. (a) What is its weight in newtons? (One newton equals 0.225 pounds.) (b) What is its mass in kilograms? (a) (0/6 submissions used) N (b) (0/6 submissions used) kg Section 5: Newton’s second law 5.5.1 When empty, a particular helicopter of mass 3770 kg can accelerate straight

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(5.00) upward at a maximum acceleration of 1.39 m/s 2 . A careless crewman overloads the helicopter so that it is just unable to lift off. What is the mass of the cargo? (0/6 submissions used) kg 5.5.3 (5.00) In the illustration, you see the graph of an object's acceleration over time. (a) At what moment is it experiencing the most positive force? (b) The most negative force? (c) Zero force? (a) (0/6 submissions used) s (b) (0/6 submissions used) s (c) (0/6 submissions used) s 5.5.13 (7.00) Cedar Point's Top Thrill Dragster Strata-Coaster in Ohio, the fastest amusement park ride in the world as of 2004, can accelerate its riders from rest to 193 km/h in 4.00 seconds. (a) What is the magnitude of the average acceleration of a rider? (b) What is the average net force on a 45.0 kg rider during these 4.00 seconds? (c) Do people really pay money for this?
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HW Ch5 - HW Ch 5Force and Newton's Laws Chapter 5 Force and...

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