97.01: A force F directed at an angle of θ abov ,9on. pao m4uw)jje r)lwic:0e the horizontal is used to pull a cratn wo 04o)lap:miu)c ,rjw9ej. e a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movinmedf;ny8hs -9fzxf/ dw15x-2h,utxw g toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hdwndy fh;8x,z/m -sf1-f2xt9 u e5xwh and is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard xorlpq l0p.ymp) 3y* 83 meter above the floor for 4 seconds. During these 4 secondshow much power was expend. rl8 px*o0qy) lpmpy3ed on the wallboard?

  17.11: A 5.00 kg block slides with uni4 p)n wsuws3d4:suyz+form acceleration on a horizontal surface for 5.00 s. The block’s kinetic ews4:su n)uswdz+y 3 p4nergy 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 slides with unif y. wn6rcy52crx6ly;7me)n ejorm acceleration on a horizontal surface for 5.00 s. The block’s kineticmlyjn 72e6;.c xw)cyy rr6n e5 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 wgo+bp8 ohfacp6/, r7 directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface.7 c8rbp hog,ow/a 6pf+
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 is exerpt/q 18, jv+ glm1rclyh;8ty qted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface,c/y 81pq + 1 t8vllmryqtj;gh.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictic9h -v2q eo0kponless 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 in the other direction. Which of the following q9o- p c2vekh0correctly describes the above situation?

  03.14: A fan blows the airiwump;e, 3a*k5vg(gt and gives it kinetic energy. An hour after the fan g(;ium pkg*w5 ev,3athas been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 3en7 y: hg;,gqswv9v7b,uclc kg has a position of 3.0 m, a speed of s vcg:e,nc7ghvy 9wblu3 ;7q,4.0 m/s, and an acceleration of $1.0\; m/s^{2}$ . 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 fro)s4rq8kx6sa7dww7g c +s gvpt6h ry:6m 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 s8rxt6r76gyv6kc pw g)7a 4+:qsdshw on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers n hb6t 2b00. gno6nfai24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant sbhnbn tofn020a6 . i6gpeed 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 5c)shfvt9w8 )8t zyic..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 pushedc89 szf8 iwttvc). hy) directly to the left with a constant 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 speed 5.00 m/s at3.5mzxl u8hoc 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches tox.h3m zul5 8che 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 from rest, along a strai 6a gc9.ny +*ojn.gb8ozrr3,7v dyba dght road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has trav odbba.ac v7+zgnnoj rr3yg8.6y*,d9eled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object d8,e(3+sfxri pawco*a e hlw57uring the time interval of the aeho i f8pr5lc*awe3 s (wa7,x+cceleration?

  12.08: Through what distance does the object move during the time interval of - gh kzg (oqq(9fladj,3.u v6xthe accefzv(ggdlq - u x,j.q9k63ao(hleration

  12.19: The magnitude o+8jwgs7:-ej5 tvg rfu1 t)scjf the linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.0+g gsve 1jj8 u75)t-c:swrj ft0 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 fro7h1w ik)gw9+ak cmc;-mi6 vkhm 2.00m/s to 4.00m/s. Which one of the following choices best repre1hiikwhw- k9m)vgc+ma; ck76sents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to puxa:-de p1 hg2sdv 42oqz :tli+ll a heavy suitcase of weight mga distance d along a level floor at conshxtgq z: 2+d-1p 2doeasv4:litant 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 output od0282,jaq m(duerkim f 0.10 w tuia0d(jdrqm 22e8km ,o raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Eart ; 2;a+: iduz.fqodfsqh, the gravitational 2ia zfduq;so d:;f.+q 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 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 helm85 u ehwv(2zmd motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows ve52 w mhu(m8zthe 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 mv7ujc0l g* ycjg ,uc3;/s. The driver sees a barrier ahead. If the car tajcyg l7* ;c0ju3cv,gu kes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowamz5 s.+3n p b2bnqm+ws down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whilbp. +mszw3 +bnaqm 25ne it was coming to a stop?

  02.26: Consider two laboratory carts of difipp ;3e dfxz*pt)x9::ew9x kl ferent masses but identical kinetic energies and the three following statements. Which of the above statements woul peix)lk9:9 f*zxwxetd 3p; p: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 of clay is tossed verticaic/ m4w1g2cf dv76 bzklly in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the changebvc6i1ck4 wd/2 7gf mz in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete swuf.iu4z 8qpndy0.y f5 1+ks nurface. The boy, of mass M, leaves the concrete sursyi.p. z+n04f18nfy uuwk5 dq face with speed v and his center of mass rises a distance d to the 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 Mz66 hif/ji-j0m 3yllm is dropped from 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 force exerted by the ground on t3- j 6jhl/6mi ilyzfm0he object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The objeyu81 g t +4/brrtt/qjng q)q2pct bounces off of a horizontal surface in a collision lasting tq24pj)rgtg /+1qrt8qun y bt/ ime 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 mass mon a cord ldat+p 7vq i.3qy (u+vmpcdh6+ength L is pulled sideways until the cord makesqm+ ( 3+ ph.v7p iv6daqdc+yut 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 uniformr/l5mmddo i hz-v1 0.i incline of unknown angle. The sled, which started at the bottom of the incline mvdlrh5 i0m.-/dio 1zmoving 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 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-m8/s7evru (ob ueter ramp to a loadin(ubr8u/ ve os7g 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 move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the 6.k*3odzu 2 j7d2wdc;bj 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 represendo 2k3cd2wj7bdu ; z*jts the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest frexon5q +(3gsh om the top of a tall tower. Ball A is dropped one second before ball B.eshxg 3 5oq+n( 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 acd 4 kf1drsy;8t1c8dup/x p; vn object of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launchcyp; 18dt8c /4s1xdkf;d vurp 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 of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/m. ucn8c(51 (t( vbfn p* 1pkj cjkw:a)fcThe potential energy sto(8f cwbj5 1:v fn)t an1k(jp(uccc* pkred in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What 7e4 k *0mrfoc cuxv/p- ggq4(fis the maximum speed it can impku-7c m*x4( e/f c0rf4gqgopv art to a 2.0-kg object ?

  

  10.31: An object of m ztd9crm(/ vm)ass M starts from rest at the bottom of a fixed incline of height H. A person decides to push the object up the incline in one ofmz(cvrd9tm /) 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 two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.