97.01: A force F directed at an angle of θ above the horizontal is used to pu p(o1u48oamua32ayg f ,+g plnll a crate a distance D across a level floor. The,y8umn ap(po+ glufog143a a 2 work done by the force F is

  97.33: A softball player catches a ball of mass m,koca - vc6 *)x yiy1;.v4 slk6t)rrupa which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the ho.c1sir;-a uk)ayv6 6 o t *4y)rpklxvcrizontal force exerted on the ball by her hand is

  99.14: A construction laborer holdy x )cgv 22*c( (wdsx*7slbleps a 20 kilogram sheet of wallboard 3 meter above the floor fc )p( l xvdls*x2wy2cb7g*(esor 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontadt:yj 0. l27t ;5akns+a kobxul surface for 5.00 s. The block’s kinetic;ko0u a2tsjnt b7.5:xakl+dy energy strictly decreases from 50.0 J to 20.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block vgc6i) gy.wulap( 00p slides with uniform acceleration on a horizontal surface for 5.00 s. c)0(w.v 0lgyia pug6 pThe block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.
Which one of the following choices best represents the magnitude of the block’s acceleration during the motion described?

  16.11: A 12.0 N net force directed to the right is euj21 p-/ hdv;gnvkm07xn )nosxerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal npvg ;7skh0 -ouj12xv nd )m/nsurface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force directed to the right isveqy130z yqvf)-gjls hx9yx zaoq4,8m/(, m c exerted on a 3.0 kg block for 5.0 s. The block was initially alq coyyjg 9q3,-x48v0hz/q (s,yvzamxm 1ef) t rest and slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at restosqxjsam og l,+2(j+ 8an a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hqjs8+masl xga,(oj+ 2ammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air xkl55bbx3 s ,land gives it kinetic energy. An hour after the fan has been tu5 xlx35,l kbsbrned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg haym (dt*xng/8 fs a position of 3.0 m, a speed of 4.0 m/s, and an acceleration fdmn (*xtg/8yof $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the bookroom 1.3 m h+s( (8a vlohdy5xlp4from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does he do on the box. The box has a mass of 10+8sa(pd y(olh 4vlxh 5.0 kg.

  02.32: An automobile engine delivers 24,000 watts (abotyn+w8 8;j+vth+w bhwut 32 horsepower) of power to a car's driving wheey8+ j n8;tw+hwhtbw+v ls. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at tz:)2mhlknl.0hchrj:k vm ; z3k,. aqlhe bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a c q3 ,.lh nhaz.;k0j2k r:c)l:mvkhzmlonstant force ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the right, a box moves with speeddn *dg.k cm46pbzh2o w3/m r6(-qpydj 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline a-.kb p2mpgdq(h6 4dn3mrc*zyjd/6wo s it is being pushed directly to the left with a constant force of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travqu qdw:u(2/qo uv49 ybaix ).mel to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distauuq/ 4:v9).qd2xqwa ioym(ubnce F, Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object n54sir)sea ,m during the time interval of the accen)r4ie5ms s ,aleration?

  12.08: Through what distance does the object mougn fq, a1j-b 5mnz+6qve during the time interval of the 1 g5n+z j 6uf,qn-abqmacceleration

  12.19: The magnitude of the linear mof l;(ffcov1qu,/ a+xc mentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the ch qo+lf ua(cv;,/x1cffange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is : o8yrs*d3n qnincreased from 2.00m/s to 4.00m/n3qyd:sr* on 8s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horrsj rhyl4q:i*.h y * mmes4u08izontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. il.ur48j0esy*symhq 4hr* m: The coefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power outp salpw3 sc6,,qut of 0.10 w to raise a block vertically at a constant speed. At what constant speed will l caq 3p6ss,w,this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released frq +t/ zvdoi*p;om rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the object as it falls 1.00 mto the ground, which one od/v+ ;t*qzoipf the following choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor tr4/ b9 n)xwf9od1/lfqiox ,i and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E919xr )nib o/f/idfot4qlw ,x of the ball and its height h above the surface?

  07.06: A 500-kg car is movin 6 aa+xrtnmqdr 74 69olbnq8.lg at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to r rrl6na7694x8.ao+d qtqblmn est, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slow2msk5q/ wlzz8s down uniformly until it stops. If the ball travels 15 meters, what was the average net force appliekm5qz8w/ sz2l d while it was coming to a stop?

  02.26: Consider two laboratory carr 44*k )wzhbgcts of different masses but identical kinetic energies and the three following strzh)b 4k* 4wcgatements. Which of the above statements would be correct?
I. The one with the greatest mass has the greatest momentum
II. The same impulse was required to accelerate each cart from rest III. Both can do the same amount of work as they come to a stop

  06.19: A 60.0-kgball of clay is t-o*lt*hj mz z4ja r,*do:pk5 t+6ip oyossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential etoldp5+z* oj *mz yhi-jr*6a4,po:kt nergy when it reaches its highest point?

  06.20: A boy jumps from 4zs:c 7q0gkjt)o .fk trest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d to th js.ctqo4k )tz0:kfg 7e highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the groun:sw guu-s/,5cb nt8 fud. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, what is the magnitude of the average constant force exerted by the ground on the object while coming 85s, gb-wt ufu:nc/suto rest?

  12.48: An object of mass Mfh. q-3(bb78xnzrky l is dropped from aheight H above the ground. The object rl 78k bhfb-xqn.y3(z bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. What was the magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob masiw+b d9/s2x nker 6x(xs mon a cord length L is pulled sideways until the cord makes /xsdx 2b(e x9 rni6kw+an angle
θ with the vertical as shown in the figure to the right. The change in potential energy of the bob during the displacement is:

  03.49: A sled slidesz)v66ou w5b:fb hdi,u up a uniform incline of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, risb)zu, ov:bh i w5fd6u6es to a height of 3.30 m above its starting position and momentarily comes to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-m mdm.q/;nbv e al6.e5oeter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the deliveryman on the cartons to moved/oba. 5 mven;e mql6. them to the loading dock?

  12.16: A constant force F=50N (as s+ aiz9 5qhxv9 yeqj o/xp:vz3k1v/j+ phown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the jz hz/+/pvv+qi9y 3qe xk9o 5v1xj:pa following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are eav 0i0b/:g hlil9njd4-qqkc( ach dropped from rest from the top of a tall tower. Ball A is dropped one seconvl0c9a4lhnij0-( /ikbqq : gdd before ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object 2k/ rq. 1sgnetmm/ (m7oug.i/ jv oi-gof mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person nmg/veks(.i or jgtum1 mi7/-/q 2.ong ow throws an object of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a sprrzyq 9h6 1xws(ing that has a spring constant of 20 N/m. The potential energy stored yh(srzw69x q1in the spring is:

  97.10: A compressed springazo;m53u zd9n:d 4bk q5 (vlvo has 16 J of potential energy. What is the maximum speed it can lmka qu z(d3o: bzo;dvv4559n impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixeei1n*xr,2faav o d8 v5i+ voz)d incline of height H. A person decides to push the object up the incline in one of two ways with an applied force shown in the diagram. In each of the trials, the object reaches the top of the incline with speed V. How would the work done by the person on the block compare for the tw5aoa ien2oz1* ,v+vx8d r )ifvo trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.