39.40.41.In moving an object 7.0 m, 40 J of energy are expended. The average force exerted isclosest to(a) 2.8 x 10² N (b) 47 N(c) 28 N (d) 5.7 N (e) 0.18 NA bullet is fired from a gun with a speed of 1000 cm/s. If the bullet has a mass of 0.01 kg,it possesses a kinetic energy of(a) 0.05 J(b) 0.5 J(c) 1 J(d) 5 J(e) 5 x 10³ JMr. Brady takes the elevator out side his office. The elevator is rising at a constant velocity.Consider these statements concerning the elevator.1)The upward force in the supporting cable is of constant magnitude.The kinetic energy of the elevator is constant.Its gravitational potential energy is constant.Its acceleration is zero.The sum of its kinetic energy and its gravitational potential energy isconstant.Which one of the following groups contains true statements only?(a) I, II, III, IV, and V(b) II and V only(c) IV and V only(d) I, II, and III only(e) I, II and IV only

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39. In moving an object 7.0 m, 40 J of energy are expended. The average force exerted is closest to (a) 2.8 x 10² N (b) 47 N (c) 28 N (d) 5.7 N (e) 0.18 N

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter6: Energy Of A System

Section: Chapter Questions

Problem 57P

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