97.01: A force F directed at a-)um) 8 hqiax tdn;7tun angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The idm8qt7 x;un-)tah u )work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her wb lg(pin6f)9c8ut. guytl.3y /mh1qyith horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the ho /m3(uln.6l1 9y) h.piugytgbfyq8t crizontal force exerted on the ball by her hand is

  99.14: A construction laborer ho3j403vno 8pmp pip cl8lds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wicp p4pnlv 33moj 808pallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal suv4ua; rs;ki*rj9f9ltrface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in r tu; 4v*9lj9;s kafirthis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on a horizontal 4zsj upv.o) ogs5s: :do1g/bgsurface for 5.00 s. The block’s kinetic energy strictly decreases from 5/ :og:jusd o4obs.zgs 15p) gv0.0 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 dir: kzphs8a76e)dzpfq (ected to the right is exerted on a 3.0 kg block for 7 dzeq: k(pa s8pz6fh)5.0 s. The block was initially at rest and slides on a horizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force direcr c6hj,bko9g +)z*h)r)uzql k ted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at resc9 ,ozrkbuhq)6 *))l jh+rz gkt and slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initixv6:l e5hc2ea +ih9vpally at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off inh 2+cl ev5e96:v hipxa the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hs; 7b h3lkg5slour after the fan has be g3ksbh 7ll5;sen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0 m, o)6uj*wgll;s ;cp8ewa speed of 4.0 m/s, and an a8uw*so p) w;;ecl6lgjcceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbook ;k/f fdac39vh(:zwjg8plde .rp5j 0xs is on the middle shelf in the bookroom 1.3 m from 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 m;ej8(5d9/k0vp3cxdz glafr. jwfp h:ass of 10.0 kg.

  02.32: An automobile engine delicmi sy8 00ais-vers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. aym0ii-ss c08 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 bou wejkya+t1 +0x moves with speed 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 as it is being pushed directly to the left with a constant force ofF = 240N. The box, of mass +e0wa+tk1juy 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 wvns v3-8hy+mf 9w fg( 7(ysfsnith speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to thes -yvy(sgfhw (fsm 9v+8f73nn top of the incline as 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 travel to the right, each starting f9yb ;gqe98si rsit..krom rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has trav e krqs.sgtiy.99;8bieled the same distance F, what is its speed in terms of B?

  12.07: What is the nivk fbj5 n5 ,c//ng s6bvcm/8eet force acting on the object during the time interval of the acceleratbsijn c/ km6g /,nv efb5cv/58ion?

  12.08: Through what distance does the object move during the t.b72 yiow, jy1 1nueitime interval of the accelu1ot7 . iinw21j eby,yeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed f+b13 h too;htdb7:h ierom 6.00kg.me:do+t h3 iot1;hh7bb /s to 14.0kg.m/s in a time interval of 6.00 s. What is the change 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 increased f,(nt c xwaua44rom 2.00m/s to 4.00m/s. Which one of 4w,uc( x aa4ntthe following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizoa7c8 guchl, u.ntal is used to pull a heavy suitcase of weight mga distance d along a level flooru7u8cc,ha g.l at constant velocity. 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 och gun.0ymot o.fd 82-syv q7*utput of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this craneyg o 2y .d*ct7s0h -8uvqmn.of raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest neajs 2l6-a8gm0mxzx c r 2 -j0pqky-pc.zr 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 fa-s m6mzpc-p8 gx0- j.2yklx0j ra zc2qlls 1.00 mto the ground, which one of 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 ayv j 2.u7g1jzz hard floor and released. Assuming that the collision with the floor is elastic, u .2vz1g jy7zjwhich one of the following graphs best shows the relationship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barr a7kk8eeh,m -2ruyy6 osp. ls7ier ahead. If the car takes 95 meters to come to yup67 oles y72k.hare-m8k, srest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unotop 0zei3mu 7ci )+mue.+ u8aiformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was cominompi7 3m 8c0oe)t+z u. euaiu+g to a stop?

  02.26: Consider two laboratory carts of different masses but identical kine0jnb;;o1 mvc vtic energies and the three following statements. Which of the above statements woul nj;c10vbmvo;d 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 oe3 ke1o2rs1iet sg2y/a6 3kk pf clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, 16g3 22ky r3/es aoektk i1psewhat is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest so-k /o6e q:/ izhei)br3t vyl:traight 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 the highest point ro i:yekth ) 3-velizb q/6/:oof 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 /a;bzx9 g7iq tfrom aheightH above the ground. 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 forc;axq / gbzt7i9e exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The ob-z94ol cp b1bdject 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 f1p bl9 dcbzo4-orce acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon *oqcz+jvcz sexps8aa89* rq 8w 97c.rv jr3d+a cord length L is pulled sideways until the cord ma3cdr j*a*ovq9zrccxe w8sj+97 rq+s.8zp8v a kes 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 slides up a uniform incline of unknown angle. The sled, -di qo+d /9 gpvkohzz5mnq+ t9rir641 which started at the bottom of the incline moving at 10.0 m/s, rises 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 9rvqm6 9pq 5-ir tzd4z+hi n1/+gokdothe sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons f;b *7hhl.u3 qfnw9mpq rom the sidewalk, along a 10-meter 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 thefqh 7;mpwln b*q9.u 3h deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is ap+ (4 7jfphhffmplied 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 following choices best represents the work done by the forch7f+m f(4hf jpe F onthe box for the motion?

  04.48: Two identical bowling balls A and B are0 ,7n2o y38gxrnuv xg2sd/ ae3tiks .k each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. Afterak0.7utsg o xd3nix 2v3/nyrkg2, es 8 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 of mass M suqsxov*w/n/cy0:6 4n.yly f 9uzly r 0traight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an object of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object x6flvylrn z/90u*uc0.: wo ysnqy/y 4 of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spriljqmxvn 8;lh1pe( m((ng that has a spring constant of 20 N/m. The potentiax(pen;8ql (m (jvmhl1l energy stored in the spring is:

  97.10: A compressed spring has 16 J8iu3iuuwn (um 4wmi.6 of potential energy. What is the maximum speed it can impart to a 2.0-kg object ?mmiu8u(u .64uiw n3w i

  

  10.31: An object of mass M st)vi tz)mn rf-7arts from rest at the bottom of a fixed 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 t-nf)z7) vir mthe two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.