Physics 10th Edition solutions

Physics 10e
A hand exerciser utilizes a coiled spring. A force of 89.0 N is required to compress the spring by 0.0191 m. Determine the force needed to compress the spring by 0.0508 m.

Physics 10e
The drawing shows three identical springs hanging from the ceiling. Nothing is attached to the fi rst spring, whereas a 4.50-N block hangs from the second spring. A block of unknown weight hangs from the third spring. From the drawing, determine (a) the spring constant (in N/m) and (b) the weight of

Physics 10e
In a room that is 2.44 m high, a spring (unstrained length 5 0.30 m) hangs from the ceiling. A board whose length is 1.98 m is attached to the free end of the spring. The board hangs straight down, so that its 1.98-m length is perpendicular to the fl oor. The weight of the board (104 N) stretches the

Physics 10e
A spring lies on a horizontal table, and the left end of the spring is attached to a wall. The other end is connected to a box. The box is pulled to the right, stretching the spring. Static friction exists between the box and the table, so when the spring is stretched only by a small amount and the b

Physics 10e
A person who weighs 670 N steps onto a spring scale in the bathroom, and the spring compresses by 0.79 cm. (a) What is the spring constant? (b) What is the weight of another person who compresses the spring by 0.34 cm?

Physics 10e
A spring (k 5 830 N/m) is hanging from the ceiling of an elevator, and a 5.0-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a 5 0.60 m/s2 ?

Physics 10e
A 0.70-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the fi rst one, and the amount that the spring stretches from its unstrained length triples. What is the mass of the second block?

Physics 10e
A uniform 1.4-kg rod that is 0.75 m long is suspended at rest from the ceiling by two springs, one at each end of the rod. Both springs hang straight down from the ceiling. The springs have identical lengths when they are unstretched. Their spring constants are 59 N/m and 33 N/m. Find the angle that

Physics 10e
In 0.750 s, a 7.00-kg block is pulled through a distance of 4.00 m on a frictionless horizontal surface, starting from rest. The block has a constant acceleration and is pulled by means of a horizontal spring that is attached to the block. The spring constant of the spring is 415 N/m. By how much doe

Physics 10e
Review Conceptual Example 2 as an aid in solving this problem. An object is attached to the lower end of a 100-coil spring that is hanging from the ceiling. The spring stretches by 0.160 m. The spring is then cut into two identical springs of 50 coils each. As the drawing shows, each spring is attach

Physics 10e
A small ball is attached to one end of a spring that has an unstrained length of 0.200 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.00 m/s. The spring remains nearly parallel to the ground during the motion and is observed to stretch by

Physics 10e
To measure the static friction coeffi cient between a 1.6-kg block and a vertical wall, the setup shown in the drawing is used. A spring (spring constant 5 510 N/m) is attached to the block. Someone pushes on the end of the spring in a direction perpendicular to the wall until the block does not slip

Physics 10e
A 30.0-kg block is resting on a fl at horizontal table. On top of this block is resting a 15.0-kg block, to which a horizontal spring is attached, as the drawing illustrates. The spring constant of the spring is 325 N/m. The coeffi cient of kinetic friction between the lower block and the table is 0.

Physics 10e
A 15.0-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 5.00 m/s in 0.500 s. In the process, the spring is stretched by 0.200

Physics 10e
When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 6.3 3 1027 m and a maximum speed of 2.9 3 1023 m/s. (a) What is the frequency (in Hz) of the eardrums vibration? (b) What is the maximum acceleration of the eardru

Physics 10e
The fan blades on a jet engine make one thousand revolutions in a time of 50.0 ms. Determine (a) the period (in seconds) and (b) the frequency (in Hz) of the rotational motion. (c) What is the angular frequency of the blades?

Physics 10e
A block of mass m 5 0.750 kg is fastened to an unstrained horizontal spring whose spring constant is k 5 82.0 N/m. The block is given a displacement of 10.120 m, where the 1 sign indicates that the displacement is along the 1x axis, and then released from rest. (a) What is the force (magnitude and di

Physics 10e
An 0.80-kg object is attached to one end of a spring, as in Figure 10.5, and the system is set into simple harmonic motion. The displacement x of the object as a function of time is shown in the drawing. With the aid of these data, determine (a) the amplitude A of the motion, (b) the angular frequenc

Physics 10e
Refer to Conceptual Example 2 as an aid in solving this problem. A 100-coil spring has a spring constant of 420 N/m. It is cut into four shorter springs, each of which has 25 coils. One end of a 25-coil spring is attached to a wall. An object of mass 46 kg is attached to the other end of the spring,

Physics 10e
Objects of equal mass are oscillating up and down in simple harmonic motion on two diff erent vertical springs. The spring constant of spring 1 is 174 N/m. The motion of the object on spring 1 has twice the amplitude as the motion of the object on spring 2. The magnitude of the maximum velocity is th

Physics 10e
A spring stretches by 0.018 m when a 2.8-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f 5 3.0 Hz?

Physics 10e
An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. The maximum speed of the object is 1.25 m/s, and its maximum acceleration is 6.89 m/s2 . How much time elapses between an instant when the objects speed is at a maximum and the next instant when its

Physics 10e
A vertical spring (spring constant 5 112 N/m) is mounted on the fl oor. A 0.400-kg block is placed on top of the spring and pushed down to start it oscillating in simple harmonic motion. The block is not attached to the spring. (a) Obtain the frequency (in Hz) of the motion. (b) Determine the amplitu

Physics 10e
A tray is moved horizontally back and forth in simple harmonic motion at a frequency of f 5 2.00 Hz. On this tray is an empty cup. Obtain the coeffi cient of static friction between the tray and the cup, given that the cup begins slipping when the amplitude of the motion is 5.00 3 1022 m.

Physics 10e
A pen contains a spring with a spring constant of 250 N/m. When the tip of the pen is in its retracted position, the spring is compressed 5.0 mm from its unstrained length. In order to push the tip out and lock it into its writing position, the spring must be compressed an additional 6.0 mm. How much

Physics 10e
The drawing shows three situations in which a block is attached to a spring. The position labeled 0 m represents the unstrained position of the spring. The block is moved from an initial position x0 to a fi nal position xf, the magnitude of the displacement being denoted by the symbol s. Suppose the

Physics 10e
A spring is hung from the ceiling. A 0.450-kg block is then attached to the free end of the spring. When released from rest, the block drops 0.150 m before momentarily coming to rest, after which it moves back upward. (a) What is the spring constant of the spring? (b) Find the angular frequency of th

Physics 10e
A 3.2-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this springblock system is 1.8 J. What is the elastic potential energy of the system when the 3.2-kg block is replaced by a 5.0-kg block?

Physics 10e
A vertical spring with a spring constant of 450 N/m is mounted on the fl oor. From directly above the spring, which is unstrained, a 0.30-kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 2.5 cm in bringing the block to a momentary halt. Assuming air res

Physics 10e
In preparation for shooting a ball in a pinball machine, a spring (k 5 675 N/m) is compressed by 0.0650 m relative to its unstrained length. The ball (m 5 0.0585 kg) is at rest against the spring at point A. When the spring is released, the ball slides (without rolling). It leaves the spring and arri

Physics 10e
A heavy-duty stapling gun uses a 0.140-kg metal rod that rams against the staple to eject it. The rod is attached to and pushed by a stiff spring called a ram spring (k 5 32 000 N/m). The mass of this spring may be ignored. The ram spring is compressed by 3.0 3 1022 m from its unstrained length and t

Physics 10e
A rifle fires a 2.10 3 1022 -kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 9.10 3 1022 m from its unstrained length. The pellet rises to a maximum height of 6.10 m above its

Physics 10e
A 1.00 3 1022 -kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 124 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 8.00 m/s, while the spring is initially unstrained. What is the amplitude o

Physics 10e
An 86.0-kg climber is scaling the vertical wall of a mountain. His safety rope is made of nylon that, when stretched, behaves like a spring with a spring constant of 1.20 3 103 N/m. He accidentally slips and falls freely for 0.750 m before the rope runs out of slack. How much is the rope stretched wh

Physics 10e
A horizontal spring is lying on a frictionless surface. One end of the spring is attached to a wall, and the other end is connected to a movable object. The spring and object are compressed by 0.065 m, released from rest, and subsequently oscillate back and forth with an angular frequency of 11.3 rad

Physics 10e
A spring is resting vertically on a table. A small box is dropped onto the top of the spring and compresses it. Suppose the spring has a spring constant of 450 N/m and the box has a mass of 1.5 kg. The speed of the box just before it makes contact with the spring is 0.49 m/s. (a) Determine the magnit

Physics 10e
A spring is compressed by 0.0620 m and is used to launch an object horizontally with a speed of 1.50 m/s. If the object were attached to the spring, at what angular frequency (in rad/s) would it oscillate?

Physics 10e
A 0.60-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.12 to 0.23 m (relative to its unstrained length), the speed of the sphere decreases from 5.70 to 4.80 m/s. What is the spring constant of the spring?

Physics 10e
Review Conceptual Example 8 before starting this problem. A block is attached to a horizontal spring and oscillates back and forth on a frictionless horizontal surface at a frequency of 3.00 Hz. The amplitude of the motion is 5.08 3 1022 m. At the point where the block has its maximum speed, it sudde

Physics 10e
A 1.1-kg object is suspended from a vertical spring whose spring constant is 120 N/m. (a) Find the amount by which the spring is stretched from its unstrained length. (b) The object is pulled straight down by an additional distance of 0.20 m and released from rest. Find the speed with which the objec

Physics 10e
A 70.0-kg circus performer is fi red from a cannon that is elevated at an angle of 40.08 above the horizontal. The cannon uses strong elastic bands to propel the performer, much in the same way that a slingshot fi res a stone. Setting up for this stunt involves stretching the bands by 3.00 m from t

Physics 10e
A 1.00 3 1022 -kg bullet is fi red horizontally into a 2.50-kg wooden block attached to one end of a massless horizontal spring (k 5 845 N/m). The other end of the spring is fi xed in place, and the spring is unstrained initially. The block rests on a horizontal, frictionless surface. The bullet stri

Physics 10e
A simple pendulum is made from a 0.65-m-long string and a small ball attached to its free end. The ball is pulled to one side through a small angle and then released from rest. After the ball is released, how much time elapses before it attains its greatest speed?

Physics 10e
Astronauts on a distant planet set up a simple pendulum of length 1.2 m. The pendulum executes simple harmonic motion and makes 100 complete vibrations in 280 s. What is the magnitude of the acceleration due to gravity on this planet?

Physics 10e
The length of a simple pendulum is 0.79 m and the mass of the particle (the bob) at the end of the cable is 0.24 kg. The pendulum is pulled away from its equilibrium position by an angle of 8.508 and released from rest. Assume that friction can be neglected and that the resulting oscillatory motion i

Physics 10e
A spiral staircase winds up to the top of a tower in an old castle. To measure the height of the tower, a rope is attached to the top of the tower and hung down the center of the staircase. However, nothing is available with which to measure the length of the rope. Therefore, at the bottom of the rop

Physics 10e
Two physical pendulums (not simple pendulums) are made from meter sticks that are suspended from the ceiling at one end. The sticks are uniform and are identical in all respects, except that one is made of wood (mass 5 0.17 kg) and the other of metal (mass 5 0.85 kg). They are set into oscillation an

Physics 10e
Multiple-Concept Example 11 explores the concepts that are important in this problem. Pendulum A is a physical pendulum made from a thin, rigid, and uniform rod whose length is d. One end of this rod is attached to the ceiling by a frictionless hinge, so the rod is free to swing back and forth. Pendu

Physics 10e
Multiple-Concept Example 11 provides some pertinent background for this problem. A pendulum is constructed from a thin, rigid, and uniform rod with a small sphere attached to the end opposite the pivot. This arrangement is a good approximation to a simple pendulum (period 5 0.66 s), because the mass

Physics 10e
A small object oscillates back and forth at the bottom of a frictionless hemispherical bowl, as the drawing illustrates. The radius of the bowl is R, and the angle u is small enough that the object oscillates in simple harmonic motion. Derive an expression for the angular frequency v of the motion. E

Physics 10e
A tow truck is pulling a car out of a ditch by means of a steel cable that is 9.1 m long and has a radius of 0.50 cm. When the car just begins to move, the tension in the cable is 890 N. How much has the cable stretched?

Physics 10e
Two stretched cables both experience the same stress. The fi rst cable has a radius of 3.5 3 1023 m and is subject to a stretching force of 270 N. The radius of the second cable is 5.1 3 1023 m. Determine the stretching force acting on the second cable

Physics 10e
The pressure increases by 1.0 3 104 N/m2 for every meter of depth beneath the surface of the ocean. At what depth does the volume of a Pyrex glass cube, 1.0 3 1022 m on an edge at the oceans surface, decrease by 1.0 3 10210 m3 ?

Physics 10e
When subjected to a force of compression, the length of a bone decreases by 2.7 3 1025 m. When this same bone is subjected to a tensile force of the same magnitude, by how much does it stretch?

Physics 10e
A 59-kg water skier is being pulled by a nylon tow rope that is attached to a boat. The unstretched length of the rope is 12 m, and its crosssectional area is 2.0 3 1025 m2 . As the skier moves, a resistive force (due to the water) of magnitude 130 N acts on her; this force is directed opposite to he

Physics 10e
A solid steel cylinder is standing (on one of its ends) vertically on the fl oor. The length of the cylinder is 3.6 m and its radius is 65 cm. When an object is placed on top of the cylinder, the cylinder compresses by an amount of 5.7 3 1027 m. What is the weight of the object?

Physics 10e
The drawing shows a 160-kg crate hanging from the end of a steel bar. The length of the bar is 0.10 m, and its cross-sectional area is 3.2 3 1024 m2 . Neglect the weight of the bar itself and determine (a) the shear stress on the bar and (b) the vertical defl ection DY of the right end of the bar.

Physics 10e
A copper cube, 0.30 m on a side, is subjected to two shearing forces, each of which has a magnitude F 5 6.0 3 106 N (see the drawing). Find the angle u (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.

Physics 10e
Two metal beams are joined together by four rivets, as the drawing indicates. Each rivet has a radius of 5.0 3 1023 m and is to be exposed to a shearing stress of no more than 5.0 3 108 Pa. What is the maximum tension T B that can be applied to each beam, assuming that each rivet carries one-fourth o

Physics 10e
A copper cylinder and a brass cylinder are stacked end to end, as in the drawing. Each cylinder has a radius of 0.25 cm. A compressive force of F 5 6500 N is applied to the right end of the brass cylinder. Find the amount by which the length of the stack decreases.

Physics 10e
A piece of aluminum is surrounded by air at a pressure of 1.01 3 105 Pa. The aluminum is placed in a vacuum chamber where the pressure is reduced to zero. Determine the fractional change DV/V0 in the volume of the aluminum

Physics 10e
One end of a piano wire is wrapped around a cylindrical tuning peg and the other end is fi xed in place. The tuning peg is turned so as to stretch the wire. The piano wire is made from steel (Y 5 2.0 3 1011 N/m2 ). It has a radius of 0.80 mm and an unstrained length of 0.76 m. The radius of the tunin

Physics 10e
A die is designed to punch holes with a radius of 1.00 3 1022 m in a metal sheet that is 3.0 3 1023 m thick, as the drawing illustrates. To punch through the sheet, the die must exert a shearing stress of 3.5 3 108 Pa. What force F B must be applied to the die?

Physics 10e
A piece of mohair taken from an Angora goat has a radius of 31 3 1026 m. What is the least number of identical pieces of mohair needed to suspend a 75-kg person, so the strain experienced by each piece is less than 0.010? Assume that the tension is the same in all the pieces

Physics 10e
Two rods are identical in all respects except one: one rod is made from aluminum and the other from tungsten. The rods are joined end to end, in order to make a single rod that is twice as long as either the aluminum or tungsten rod. What is the eff ective value of Youngs modulus for this composite r

Physics 10e
A square plate is 1.0 3 1022 m thick, measures 3.0 3 1022 m on a side, and has a mass of 7.2 3 1022 kg. The shear modulus of the material is 2.0 3 1010 N/m2 . One of the square faces rests on a fl at horizontal surface, and the coeffi cient of static friction between the plate and the surface is 0.91

Physics 10e
A gymnast does a one-arm handstand. The humerus, which is the upper arm bone (between the elbow and the shoulder joint), may be approximated as a 0.30-m-long cylinder with an outer radius of 1.00 3 1022 m and a hollow inner core with a radius of 4.0 3 1023 m. Excluding the arm, the mass of the gymnas

Physics 10e
Depending on how you fall, you can break a bone easily. The severity of the break depends on how much energy the bone absorbs in the accident, and to evaluate this let us treat the bone as an ideal spring. The maximum applied force of compression that one mans thighbone can endure without breaking is

Physics 10e
A 1.0 3 1023 -kg spider is hanging vertically by a thread that has a Youngs modulus of 4.5 3 109 N/m2 and a radius of 13 3 1026 m. Suppose that a 95-kg person is hanging vertically on an aluminum wire. What is the radius of the wire that would exhibit the same strain as the spiders thread, when the t

Physics 10e
The dimensions of a rectangular block of brass are 0.010 m, 0.020 m, and 0.040 m. The block is to be glued to a table and subjected to a horizontal force of 770 N, as in Figure 10.29. Note that there are three possibilities for the surface of the block that is in contact with the table. What is the m

Physics 10e
A 61-kg snow skier is being pulled up a 128 slope by a steel cable. The cable has a cross-sectional area of 7.8 3 1025 m2 . The cable applies a force to the skier, and, in doing so, the cable stretches by 2.0 3 1024 m. A frictional force of magnitude 68 N acts on the skis and is directed opposite to

Physics 10e
A 6.8-kg bowling ball is attached to the end of a nylon cord with a cross-sectional area of 3.4 3 1025 m2 . The other end of the cord is fi xed to the ceiling. When the bowling ball is pulled to one side and released from rest, it swings downward in a circular arc. At the instant it reaches its lowes

Physics 10e
A solid brass sphere is subjected to a pressure of 1.0 3 105 Pa due to the earths atmosphere. On Venus the pressure due to the atmosphere is 9.0 3 106 Pa. By what fraction Dr/r0 (including the algebraic sign) does the radius of the sphere change when it is exposed to the Venusian atmosphere? Assume t

Physics 10e
A loudspeaker diaphragm is producing a sound for 2.5 s by moving back and forth in simple harmonic motion. The angular frequency of the motion is 7.54 3 104 rad/s. How many times does the diaphragm move back and forth?

Physics 10e
A person bounces up and down on a trampoline, while always staying in contact with it. The motion is simple harmonic motion, and it takes 1.90 s to complete one cycle. The height of each bounce above the equilibrium position is 45.0 cm. Determine (a) the amplitude and (b) the angular frequency of the

Physics 10e
A simple pendulum is swinging back and forth through a small angle, its motion repeating every 1.25 s. How much longer should the pendulum be made in order to increase its period by 0.20 s?

Physics 10e
Multiple-Concept Example 6 presents a model for solving this problem. As far as vertical oscillations are concerned, a certain automobile can be considered to be mounted on four identical springs, each having a spring constant of 1.30 3 105 N/m. Four identical passengers sit down inside the car, and

Physics 10e
The femur is a bone in the leg whose minimum cross-sectional area is about 4.0 3 1024 m2 . A compressional force in excess of 6.8 3 104 N will fracture this bone. (a) Find the maximum stress that this bone can withstand. (b) What is the strain that exists under a maximum-stress condition?

Physics 10e
An archer, about to shoot an arrow, is applying a force of 1240 N to a drawn bowstring. The bow behaves like an ideal spring whose spring constant is 480 N/m. What is the displacement of the bowstring?

Physics 10e
Between each pair of vertebrae in the spinal column is a cylindrical disc of cartilage. Typically, this disc has a radius of about 3.0 3 1022 m and a thickness of about 7.0 3 1023 m. The shear modulus of cartilage is 1.2 3 107 N/m2 . Suppose that a shearing force of magnitude 11 N is applied parallel

Physics 10e
A block rests on a frictionless horizontal surface and is attached to a spring. When set into simple harmonic motion, the block oscillates back and forth with an angular frequency of 7.0 rad/s. The drawing indicates the position of the block when the spring is unstrained. This position is labeled x 5

Physics 10e
A vertical ideal spring is mounted on the fl oor and has a spring constant of 170 N/m. A 0.64-kg block is placed on the spring in two diff erent ways. (a) In one case, the block is placed on the spring and not released until it rests stationary on the spring in its equilibrium position. Determine the

Physics 10e
Multiple-Concept Example 6 reviews the principles that play roles in this problem. A bungee jumper, whose mass is 82 kg, jumps from a tall platform. After reaching his lowest point, he continues to oscillate up and down, reaching the low point two more times in 9.6 s. Ignoring air resistance and assu

Physics 10e
An 11.2-kg block and a 21.7-kg block are resting on a horizontal frictionless surface. Between the two is squeezed a spring (spring constant 5 1330 N/m). The spring is compressed by 0.141 m from its unstrained length and is not attached to either block. With what speed does each block move away after

Physics 10e
When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, it oscillates at a frequency of 12.0 Hz. When another object of mass m2 is hung on the spring along with the fi rst object, the frequency of the motion is 4.00 Hz. Find the ratio m2/m1 of the masses.

Physics 10e
An 8.0-kg stone at the end of a steel wire is being whirled in a circle at a constant tangential speed of 12 m/s. The stone is moving on the surface of a frictionless horizontal table. The wire is 4.0 m long and has a radius of 1.0 3 1023 m. Find the strain in the wire.

Physics 10e
A 0.200-m uniform bar has a mass of 0.750 kg and is released from rest in the vertical position, as the drawing indicates. The spring is initially unstrained and has a spring constant of k 5 25.0 N/m. Find the tangential speed with which end A strikes the horizontal surface.

Physics 10e
The drawing shows two crates that are connected by a steel wire that passes over a pulley. The unstretched length of the wire is 1.5 m, and its cross-sectional area is 1.3 3 1025 m2 . The pulley is frictionless and massless. When the crates are accelerating, determine the change in length of the wire

Physics 10e
A cylindrically shaped piece of collagen (a substance found in the body in connective tissue) is being stretched by a force that increases from 0 to 3.0 3 1022 N. The length and radius of the collagen are, respectively, 2.5 and 0.091 cm, and Youngs modulus is 3.1 3 106 N/m2 . (a) If the stretching

Physics 10e
The drawing shows a top view of a frictionless horizontal surface, where there are two springs with particles of mass m1 and m2 attached to them. Each spring has a spring constant of 120 N/m. The particles are pulled to the right and then released from the positions shown in the drawing. How much tim

Physics 10e
A copper rod (length 5 2.0 m, radius 5 3.0 3 1023 m) hangs down from the ceiling.A 9.0-kg object is attached to the lower end of the rod. The rod acts as a spring, and the object oscillates vertically with a small amplitude. Ignoring the rods mass, fi nd the frequency f of the simple harmonic motion.

Physics 10e
A helicopter is using a steel cable to lift a 2100-kg jeep (see the fi gure). The unstretched length of the cable is 16 m, and its radius is 5.0 3 1023 m. By what amount does the cable stretch when the jeep is hoisted straight upward with an acceleration of 11.5 m/s2 ? (a) The jeep applies a force 2F

Physics 10e
A 75-kg diver is standing at the end of a diving board while it is vibrating up and down in simple harmonic motion, as indicated in the fi gure. The diving board has an eff ective spring constant of k 5 4100 N/m, and the vertical distance between the highest and lowest points in the motion is 0.30 m.

Physics 10e
A 68.0-kg bungee jumper is standing on a tall platform (h0 5 46.0 m), as indicated in the fi gure. The bungee cord has a natural length of L0 = 9.00 m and, when stretched, behaves like an ideal spring with a spring constant of k 5 66.0 N/m. The jumper falls from rest, and it is assumed that the only