97.01: A force F directed at an angleri/e0f5u q*plgv8,fl:pj c)e of θ above the horizontal is used to pull a crate a distance D across a levieq/ru v, c8*:0fje5 )g plflpel floor. The work done by the force F is

  97.33: A softball plevr,be/q:2jo cz l x iwx6:n94ayer catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her han,426wbzl qe:rvn xe9/i: xcojd moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet;mjv 7:leeaf1v6p -cb of wallboard 3 meter above the floor for 4 seconds. During these 4 se:e7lc ;vbjamf-v p 1e6condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with un vo*yk )5lpz1aiform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J ink*vz po15a) yl this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides q55pm5 ujrc -pwith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly p55qujcmp r5-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 theb,7u5)cw , ilpstl8dz right is exerted on a 3.0 kg block for 5.0 s. The block was )sc,,8 5zluib 7t wldpinitially 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 exertm xoy7)+ar4nw sn9ht *:y5g7gbs adc7ed on a 3.0 kg block for 5.0 s. The block was initially ac 5tar 97hwxnym:)y7gs+g * saobn7d4t 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 reston a frictionless frozen4budf8intsd99. cf f. pond throws a 1 kg hammer in one direction. Ab.s8i9n tff4ddf. c9 ufter the throw, the hammer 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 and gives it kinetic energy. An hour after w ngx( aaxjf2w2-bp8f;* 3yekthe fan has been tur ;n2w*pe8g(ja2af kxw x f3b-yned 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, a speed l bm+zw-m i:ux7oj5t. of 4.0 m/s, and a7iozjxwl+m t. mu 5:-bn 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 shely mxrg q+.k5/dqm qe9 vem;9r9f in the bookroom 1.3 m from the floor. If the janitor relocates therm+ed9 .ryk 95qmm;x gqv q/e9 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 5 m5:ze.cjwqrnee)o0watts (about 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 magnit .o)nzjeeec5r05mq:wude of the retarding force acting on the car?

  09.13: In the figure to the right, a boxi+iyc p/f2.bf 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 m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the inc+ fip2 ic.b/yfline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the riu :yo odaq4s4td455 dkj,+rnsrg 5-qyght, 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 :nrdqy+, q og4d4oyrju d5kt 4as5s-5the 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 tag ra7g4 o,q3hk.;g bos.tvh9 o the right, each starting from rest, along a straight road. CarA has t,agbhh;s43 kto 7qg ag. ovr9.wice the acceleration 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 acttubu)0vjmis+s:j)s k ez, +d)ing on the object during the time interval of the m)e:dit+j+ uuv,sz 0bsk))js acceleration?

  12.08: Through what distance do. fk(qf is wu;54rwp/tes the object move during the time interval of the acceleratf/ (piwqf4w;t .kur5sion

  12.19: The magnitude ofh8o7v,y1wy2:n6si 5dpja x sb 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 6.00 s. What is the change in the kinetic vna:d 5,j2w1ss 87x oyi6p hybenergy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kineti,xhj l;b 8n-kdc energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of xhb-n jd;,l k8the following choices best represents the mass of the crate

  94.38: A force F at an an9y z-o y1qi7qm gg:1*rb ggr(mgle θ above the horizontal is used to pull a heavy suomyqb:m( q9 grgi71 1-*yrgzgitcase of weight mga distance d along a level floor 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 upws-- thx l)h1y-rre7 myard force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant s-x1mrtlh 7s)h -y yr-epeed 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 E(ax:rmcfk0 ( garth, 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 1.0 g(a (mr:k0fcx0 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 balx jdmjmie00 (.l is held 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 the relationship between jdj(me i.xm00the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is miwreb .bnj0ghw j8k8*l( 2b- xoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magniwk28i0*nbwbbl h rx. e-8gjj(tude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformz5 ksbzn3 :v4zly until it stops. If the b: 4zkbn53zvz sall travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different lr2bih(g;/-qh7x( qxp o )uffmasses but identical kinetic energ gq2/xqfu or(();7hhbfix-lpies and the three 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 xdg4u8xvy3v4l o,rs / clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, whaxy 3dvuov4,8ls rg4 /xt is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward pn -4 8f .eml:7 vi7ozxths/us 2i)aaxfrom a flat, stationary concrete surface. z xf/ua47p sh.oasvlmti):x-7 8in 2e 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 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 ground m/gei)zgs1vsyvn5 chld b(bs )2o6/o5 z; h+r. The object crashes into some soft earth and comes to rest by compressing the /snhd)ysvo 1es;5(vcb) g/z h +zr5b6i og2mlearth 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 to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. 9 rfa4cjj8/sz 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 du8zfjr ac9 s4j/ring the collision with the surface?

  96.38: A pendulum bob mass mon a cord1cs3w vj3 d 8vpi tfkm(k4.v,ki:1hkx2 l srk0 length L is pulled sideways until the cord makes an anfs3 srvj,( lt k.k kk1wcvi:01p3v2i4 kxm8 hdgle
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 unkn.hvfe3hp2 qodla l 9z 44a3lx6own angle. The sled, which started at the bottom of the incline ma 33zo 442ellvahdlhf9 xp6q.oving 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-met5d3e8e goluj- er 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 move them to t 85oe3e- ljugdhe loading dock?

  12.16: A constant force F=5ij h7noc2;7 lq0N (as shown 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 followinqnol7 2i7 hj;cg choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B a z5xw3 qcfyywbz34v8qdi)5/ bre each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanical 4/b85 3wiyb zf 3wqyv5xzd)cqenergies of the two balls changing?

  11.28: A person throws an object of wfybk0x60q* 8tgby )q 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 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 air6 yg)80qfy0x bqtw k*b resistance.

  96.20: A force of 10 N stretches a spring that has a spring constanz4k /viw,d w ac:nd51xt of 20 N/m. The potential energy stored in the springw:,4dz iwadv n c/5x1k is:

  97.10: A compressed sprhty ik)(qp)q d3*/ zgkk5fx8 king has 16 J of potential energy. What is the maximum speed it can impart to a 2.0qz(f3g/ypk8x ki* t5kh))q kd-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incli,7vj g)(gw cucne 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 spe7(,gu)jvgw c ced 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.