9- A force on a particle is conservative if: A. its work equals the change in the kinetic energy of the particle B. it obeys Newton's second law C. it obeys Newton's third law D. its work depends on the end points of every motion, not on the path between E. it is not a frictional force 10- No kinetic energy is possessed by: A. a shooting star B. a rotating propeller on a moving airplane C. a pendulum at the bottom of its swing D. an elevator standing at the fifth floor E. a cyclone 11- The mass of an object: A. is slightly different at different locations on Earth B. is a vector C. is independent of the acceleration due to gravity D. is the same for all objects of the same size and shape E. can be measured directly and accurately on a spring scale 12-According to Gauss' law for magnetism, magnetic field lines: A. form closed loops B. start at south poles and end at north poles C. start at north poles and end at south poles D. start at both north and south poles and end at infinity E. do not exist

9- A force on a particle is conservative if: A. its work equals the change in the kinetic energy of the particle B. it obeys Newton's second law C. it obeys Newton's third law D. its work depends on the end points of every motion, not on the path between E. it is not a frictional force 10- No kinetic energy is possessed by: A. a shooting star B. a rotating propeller on a moving airplane C. a pendulum at the bottom of its swing D. an elevator standing at the fifth floor E. a cyclone 11- The mass of an object: A. is slightly different at different locations on Earth B. is a vector C. is independent of the acceleration due to gravity D. is the same for all objects of the same size and shape E. can be measured directly and accurately on a spring scale 12-According to Gauss' law for magnetism, magnetic field lines: A. form closed loops B. start at south poles and end at north poles C. start at north poles and end at south poles D. start at both north and south poles and end at infinity E. do not exist

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Description: 9- A force on a particle is conservative if:A. its work equals the change in the kinetic energy of the particleB. it obeys Newton's second lawC. it obeys Newton's third lawD. its work depends on the end points of every motion, not on the path betwee

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 13CQ: Consider the following scenario. A car for which friction is not negligible accelerates from rest...

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. An archer using a simple bow exerts a force of 180 N to draw back the bow string 0.50 m. (a) What is the average work done by the archer in preparing to launch her arrow? (Hint: Compute the average work as you would any average quantity: average work = [final work - initial work].) (b) If all the work is converted into the kinetic energy of the arrow upon its release, what is the arrow's speed as it leaves the bow? Assume the mass of the arrow is 0.021 kg and ignore any kinetic energy in the bow as it relaxes to its original shape. (c) If the arrow is shot straight up, what is the maximum height achieved by the arrow? Ignore any effects due to air resistance in making your assessment.
A 60.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 9.0 m/s. The goal of this problem is to find the maximum height she attains and her speed at half maximum height. (a) What are the interacting objects and how do they interact? (b) Select the height at which the athletes speed is 9.0 m/s as y = 0. What is her kinetic energy at this point? What is the gravitational potential energy associated with the athlete? (c) What is her kinetic energy at maximum height? What is the gravitational potential energy associated with the athlete? (d) Write a general equation for energy conservation in this case and solve for the maximum height. Substitute and obtain a numerical answer. (e) Write the general equation for energy conservation and solve for the velocity at half the maximum height. Substitute and obtain a numerical answer.
Review. You can think of the workkinetic energy theorem as a second theory of motion, parallel to Newtons laws in describing how outside influences affect the motion of an object. In this problem, solve parts (a), (b), and (c) separately from parts (d) and (e) so you can compare the predictions of the two theories. A 15.0-g bullet is accelerated from rest to a speed of 780 m/s in a rifle barrel of length 72.0 cm. (a) Find the kinetic energy of the bullet as it leaves the barrel. (b) Use the workkinetic energy theorem to find the net work that is done on the bullet. (c) Use your result to part (b) to find the magnitude of the average net force that acted on the bullet while it was in the barrel. (d) Now model the bullet as a particle under constant acceleration. Find the constant acceleration of a bullet that starts from rest and gains a speed of 780 m/s over a distance of 72.0 cm. (e) Modeling the bullet as a particle under a net force, find the net force that acted on it during its acceleration. (f) What conclusion can you draw from comparing your results of parts (c) and (e)?
A block is connected to a spring that is suspended from the ceiling. Assuming air resistance is ignored, describe the energy transformations that occur within the system consisting of the block, the Earth, and the spring when the block is set into vertical motion.
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