97.01: A force F directed at an angle of θ above thbhdu6. g; d*bwe horizontal is used to pull a crate a distance D across a level floor. Tw;.hud*gdb 6b he work done by the force F is

  97.33: A softball player catches a ball of mak9xyn8wr* 6: xfdl 6zmss m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleratinw:6xmr yd8k zlf96* xon, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet hozu x1;,g5 kfof wallboard 3 meter above the floor for 4 seconds. During these 4 se f1uz, xh;gko5condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceler5 zk0t7ap0hk n-32ho *f. xjgf.kcrgdation on a horizontal surface for 5.00 s. The block’s kinetic energy stric.k70hpjd3.zkkrgcan g fht -2f05ox*tly 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 kpy y+ 3 f3gwcl)f.9rbd*-ay mblock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy stmk y)y+lbfygr-d f3 9c.3wa* prictly 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 righ sy5wn,p3iphu5r u)l9x * .vjqt is exerted on a 3.0 kg block for 53pyvl5hrs, wip j 5nu9qx.*u).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 directed to the right is exerted on a 3dnqi(s c :s6fw+wp* kj9eg44 z.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal9gpq ed sw+skf*z(:4 i64jnc w surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a f9kur7pe wc yzn2 0i sglji9k)g0;,uh 1rictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction2n ghzu)se7rcig,091iw;k y j9lp k0u 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 and gives it kinetic energy. An hour afteg vcz:s7yf w u(vdj3:*to(ca 2r the fan has been turnedjo3uv7f*tsac( w: :2dv yz(cg off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a ch i1aruvoi/y-da*;/77 qgeq wgn +5oblock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0*-gq/y i7dw/iu+5r7e;aoac qv 1on hg 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 tsi4 : *x/gtmfxikmy( 3he bookroom 1.3 m from the floor. If the janitor tfy *3imsxi/ k g(x:4mrelocates 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 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (a 0j)t+k*7 uxh9 axssndbout 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitu+7ns*s x9k htj0dx )aude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 7z 0elw*oauh+ 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the w h7o0+u zea*ltop of the incline as it is being pushed 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 e6/psx f(arx ew8v02gright, a box 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top/pxv6ef wer8xs2 ag (0 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 *zi4rs0rfd hs tyv8+3starting from rest, along a straight road. CarA has twice the accel 4zf + ssh*ty3dri08rveration of Car B. After traveling a distance 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 during theo1rxy+ e6uk/oj3ti -n time interval of the-u r6nyj/3 +ex ot1koi acceleration?

  12.08: Through what distance does the object move during the time interval ol5sc+5 pmz5 4;+4ablfl vmt-qp* ef aof the accefl55mol+cze*+vpf 5asp m lb 4 -qta;4leration

  12.19: The magnitude of the linear momentum of 7gs2c8 :i zlwqa 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 change in the kinetic energy of the mass during this time intergw: z27qcli8sval?

  14.11: A crate gains 36.0 J of kine/a8 2ovhla-f3jngzr 1 tic energy while its speed is increased from 2.00m/ljf 2 h-a/az8rv1 ngo3s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heae0d0. kdzek.gn7th 2)wtsz0avy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is kn0e..hta t7d20)dsgzk0e zw μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force jg9.*ij8a9,fg uakik and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constan 8kakia u.99,gig*jj ft speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objec6y, .bzcy2yln t is released from 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 ony.yc,6z n 2ylbe 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 a hard flooa ab bkfzpzni w);398gh 1;r(td n+hd2r and released. Assuming that the collision with the floor is ela)+bdb (1 azn;2npfw rga8kh3t9dhzi ;stic, which 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 28od c +4z;6 ;ul1 le72pom8oomeqk5gy g m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the mini gd85uglq76;em2e1 po+oz4cy kloo ;m mum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down a d 1o5id /k,b7uvn*(okgtn(nuniformly until it stops. If the ball travels 15 meters, what was the average nn7adb /(tnu (niog1dv*5 kok ,et force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic nkos(jev;(cy9 )8xvuenergies and the three (s)v jxeuo(9cnk 8vy; following statements. 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)uo-eew-tt + q clay is tossed vertically in the air with an initial speed of -+we-ut)o eqt4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fr/v5b02eo x .tnpd5goe om 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 of the motion. How much physical work did the average normal vdn/eoo5g 2.tp0ex5b 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 aheighte29 :wsrnvl0k pm4zbf0:e)l fugrn2 6H above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Abgk2z n 04fu wfvel20pnlrsre:: 9m6 )ssuming that air resistance is negligible, what is the magnitude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above t 7xuqmsd4. ks;r d2 s8gw2*dsw- :1nc lj/jjjehe ground. The object 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 wit slnw4s :xj-.js *2kc8 d2g/q71rds dw;u mejjh the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideo yf-dzd, 1,caways until the cord make-zd dof y1ac,,s 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 : vui 4eena3:+ve7wehangle. The sled, 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 e 3uw:eni+hv4eve a:7rest. 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)yc-s+ zov2y1mcy8sg/6b fjz -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 to zfysy )gbvcm-81/2yo+j6czs tal 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 fiov gk wjkm* wue,in-()wo5 j6-gure) is applied for the 6.0 meter motion of the box-o 6e(km,*5 owj)gwjiwk-vnu 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest f0syxobq i8yj,:- 0hbjrk6:qlh /q-e q rom the top of a tall tower. Ball A is dropped rx-0oj6l hh i:b-qj,:skb8q yq/eyq0one second 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 of mass M straight upward with c xkps3 hch1-/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 of mass 0.5M rise above the launch point? Ignore air re- 3p1khh /xccssistance.

  96.20: A force of 10 N stretches a spring that has a spring const/q 9vbb51 -(qb,dxemyg rl (rjant of 20 N/m. The potential energy stored in th(y, q1x /gd9j(l b-rb q5rmbvee spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum srwcy ++ 9ksq(u1k10hegbc 5 wdpeed it can iusc5q hey0c r+kwwg1+k ( db91mpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the ym1ljkr n 10 y16vm0crbottom of a fixed incline of height 01ynrv 6jyrk10m l1mc 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 two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.