97.01: A force F directed at an angle of θ above the horizontanc c/fa09 r .z9bf;cqal is used to pull a crate a distance D acqabaf. / nfrc c0z99;cross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which sj79 max u3hc)is moving toward her with horizontal speed v. While bringing the ball to r )ha9u7xm3j scest, her hand 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 of wallboardi;2vuw e*a, n9f8ugko 3 meter above the floor for 4 seconds. During these 4 se2, iuf8kvw* ;enauog 9condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration oof c*t17z7pri:vr-k s rq am95n a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 Js fmv1z- iokt*7pa597c:rqrr 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 j :m; twml7jf;s7mx3-q*ayhhwith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thij l 3:f;m7hsm7x y -hawj;mt*qs 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 exerted on a 3.i- d5+af varz6wsyx32 0 kg block for 5.0 s. The block was initially at rest ayva-523 ix6rw dzf s+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 exertedyeyp,. ezz)h0 on a 3.0 kg block for 5.0 s. The bl, yee0p.y)zh zock was initially at 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 initi mc c5l /tsiy0+m56pui s5wf+;wt ff9ially 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 in t;9+5uftmtmsw y5 ii 0 5+f/cl 6pwsicfhe other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and giv7a2vi,jo3 )s z ibw1apes it kinetic energy. An hour after the fan has been turnedib 1,aij2z v37oa )wsp 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, b-qjpo f; m6b3/hb, -cd;wdkga speed of 4.0 m/s, and an acceleration d;hf b6cpbd-/3 ;k-g oj,w mqbof $1.0\; m/s^{2}$ . 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 f(ka8ez,ni2 5eg h0sutrom the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does z5u8,( ghite2s0 nka ehe do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile ,wcmdca4c3 kun 0j ;s+engine delivers 24,000 watts (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 magnitude mu c3+;0,c kwcjs4d anof 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 the bottom+vdpshu;6 s* +(5 wpkr/tq kmm of a rough, fixed inclined plane. The box slides(++r;s k v6tp s dk/pmm*wuhq5 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 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 7s 4cxuc,rno 4at 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 = 244s c4rxuc7 n,o0N. 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 from rest, along a straight d*z7iv cj3sfg2i63nxjz ;x +r road. CarA has twice 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 ii26i3cf n*js zv;xxr gzd3j7+n terms of B?

  12.07: What is the net force acting on the oo6z o +fg3mso3) 5qyepbject during the time interval of t) pzeo3 fmq6+o35oy gshe acceleration?

  12.08: Through what distance does the object move during the time intervfoo(lmzib+) , rh:rx(al of th hlmoori ,b)(+z :r(fxe acceleration

  12.19: The magnitude of the linear v +skm;nf6q4,n9p5mt8trv:+ghswd y momentum of a 4.00 kg point mass is changed from 6dftr5 t 4 y nm+pn8wmgvvkh; 6s,qs+9:.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 interval?

  14.11: A crate gains 36.0 J of kinetic energy while it d 8v* p tcrc2s2lsqig2+wdz-3/gm,kms speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best representgvm 3zct pdg-w28dc* sr2 ilq+m/2s,ks the mass of the crate

  94.38: A force F at an angle θ above the horizontal is ij- m mk25 kij9bi97be+cf:4irkr6 smused to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is + cj6smkibfibmr:j4k7 5i92 9mk ire-μ. The work done by the frictional force is:

  14.31: A toy crane exerts an /ff/w, t ajakigzqp)c67fq8/ upward force and delivers a useful power output of 0.10 w to raise a block vertically a)gz/ick7fpj6wa /q f/tf8q, 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 fro3lkkfl 3 hswh0y: 7 ohtex h8o1ku2z03m 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 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 durin8 23xo ey30o hkhtwl 3hzs1kh0kful :7g the fall?

  96.18: A rubber ball is held motion)2 i ez sl5qz2(sih7hhless 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 ts)h 7e(zil2 5qhzs2hi he 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 barrier ahead.ivrcn1m yz8(cu-*y0q /0 ns2 hm7e8*cykeq tc If the car takes 95 meters to come to rest, what is the magnitude of the mq(*sc1z*cyqrecm-n e2u k/icy8t8yh700n v minimum average net force necessary to stop?

  00.26: A 500-gram bal 2l 3 iez8p6;2cmw)jfp,f kjedl moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meterse 8 dk, ip cpfjz6el;2)wj2m3f, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinety(w3)rrpw x/uzfmq ws28x26 kic energies and mk fw)2y6z/(w 2rqxuw xrs38p 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+lw1:ic6ft oq of clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its higq1+ot w6lfc: ihest point?

  06.20: A boy jumps from re1xkcv.3vih 3 bst straight upward from a flat, stationary concrete surfa. vbi1vxch3 k3ce. 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. The ob 0acg/ 1cv7rehn bw0z+6 wagg*ject crashes inhc71* cg awr6g/baezw+0 n 0gvto 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 to rest?

  12.48: An object of mass n(o .b wemodz f7m0svp,:-dp 7gn6c7eM is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward ,dedpn wg o 6e7-z(vcbsop.mf077n m: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 length L is pulled s2jw6 *ng a(fwcideways until the cord makes an aj 6*wf( 2nwgacngle
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 unknow+ xyj4 h+mj*psn angle. The sled, which started at the bottom of the incline moving at 10.0 m+sp jh *+jyx4m/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 ctr j4gf(l9 l0uf06y.g j.kw wljrk8:cartons from 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, gkr 6f0j.gtk 9wy8ju r0l(:lcfw4l . jwhat 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 ggn8y -rk2;*18;zha au sruo efigure) 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 following choices best represents the work done by the force F onthe box for the motion? u s8gre8-*1zako; u y2hnr ;ag

  04.48: Two identical bowling balls A p9y-unqvu/+8cut os.*x qm)aand B are 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 energies of t.q89 n-usxm v )cqy pu*+oua/the two balls changing?

  11.28: A person throws an object of mass M straid*b kemw)o/(oex+j 7,k k)zmr i52dty ght 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)e2/*x d r)5 +km(y, dkoz7kewmoibtj 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 spxq5plj t u+z p.p:n b:n.c9j(mring constant of 20 N/m. The potential energy stol.n (9pb5jjzpun:.t +x p qm:cred in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What 7c*yoa6 r4xfsis the maximum speed it can impart to a 2.0-kg objsx6f 7ora4*y cect ?

  

  10.31: An object of mass M s/q x6,f u0l lc r mg(y*zkb05ic4m/zgvtarts 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 comparefyz u/gc*m04 l5qgrbi v,czm60l xk(/ for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.