97.01: A force F directed at a8k+dqltsx c-s d;42gd n angle of θ above the horizontal is used to pull a2 lxg8s; t-4kdds dqc+ crate 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 moving tos9wyt tb ze (qc(j*9z7ward 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 w(q* 7zj9(yzs9c ttbe ball by her hand is

  99.14: A construction laborer holds a 20hr jz;.;t l8ym kilogram sheet of wallboard 3 meter above the floor folz m .yt;jr;h8r 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontalq4w i o2ug9e ws0h(6fb surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in fsqw0b 4 ew2(u96goihthis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with unifor cygxeirg znl*n fger 5676;,,m acceleration on a horizontal surface for 5.00 s. The block’s kinetic ener;c x6yf5enzeggr,,g6i* ln r7gy 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 directed to the right is exerted on ai2, m,vhi,c-c yl+ cv16a itpn 3.0 kg block for 5.0 s. The block was initially at rest and slides on a ho,-pcmi1i nc+at,,l v y2v ihc6rizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net forcry 5mu3; m -l7-azminie 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 horizonm3- 5 -a7mizimr; unyltal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless6)zh hn s*ol,mlzt-5q,p .cwc 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 correctly descri)lpmsqccz*.w,-t ,h 6nho5z lbes the above situation?

  03.14: A fan blows the aelmp )8l(w 9jddu:dd :ir and gives it kinetic energy. An hour after the fan hdjm:wd 8 ded (p9l:u)las been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blocgh .*.s5im-9ne(/a iop dk0wk ndllc3k of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleramkol*in l.0dk3n-chdae9 w(ip.5 g/stion of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textb.8s.:j qx ihrk;cim;qooks is on the middle shelf in the bookroom 1.3 m from the floor. If the hi ;.csqjmq k;:r8ix. 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 mass of 10.0 kg.

  02.32: An automobile enginrv uy1p/86n/ osle y fq iu -tk)jolg)(0d3:yje 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 of the retarding forc)3qo oi jp 0tyrks/d(uey1 un )v-6y:jlfg/l8 e acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.0m9 35jgu,:3fyl 1vsdtyq:xnp 0 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelerati,39gjf1d::v t3 sly pymuxqn5on 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 r9tly9 ctz vza.2qu: n1ight, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelerat9t1lzav 2cn.zq9:tyu ion 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 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 startik3+i* a/ 8t qlsh(hlob:iyul,ng from rest, along a straight road. CarA has twice thes/b( * , lklhutl h+oi83q:iay 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 acting on the object dtuo*c tx k9fu egetb ,.6j:4v3uring the time interval of the accelerat:t.bjfxt,36 ouev4g cuke * t9ion?

  12.08: Through what distance does the object move during the time intervalh 2sk;w sa61r+k e5kuh of thekw+kk; 21uesh 6 5rhas acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changuux-6w *p/x)/ vyjxxred from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the c)xp *6j-v/ xryxw/uxuhange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spee:df7,o1 gfc 4ph c66lf7yba *l ia.fvtd is increased from 2.00m/s to 4.00m/s. Wh b7 ,af:f*1pvly fihl67gct 4daf o6.cich one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ-xyiazy1i:t3 above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor a: yai1zi 3txy-nd the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts a/ tz1nm.q) xnbn upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed wilzt )mnn.x /b1ql this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth,l jf3xnc*0(0f;alij b the gravitational force acting on the 1.00 kg object byj*n (jlfb 3a fxl;00ic 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 held .l4ezht2x ,j smotionless a height ho above a hard floor and released. Assuming that the ch, tes2. 4xzljollision with the floor is elastic, 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 28 m/s. The driver sees a barrier:p /:l3on sojj ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessarysl po3 j:n:/oj to stop?

  00.26: A 500-gram ball movxxdc1+ b81dnr*ihdeor9//9b 4gn x rping at 15 m/s slows down uniformly until it stops. If the balnd8 ceb d+r/ b o1gr nxp49d/9hxx*ir1l travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two )yui7 xi kl,n.u.(sza laboratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would be couuk.7,s)x iilzyn.a (rrect?
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 ::yyvq-d 3zxqw, k0z sis tossed vertically in the air with an initial speedq :y,: vxsq-z0zw k3yd of 4.60 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 from a flat, station+.r0gnncopt :ary 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 force of contact (N) betweepnc0: r.t+g non the boy’ s feet and the concrete do on the boy?

  02.48: An object of mas 8ho 1pk.rw wmu36tw hlr)7*fys M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to reso)yh81. 3 7pwt l*frhwum6rk wt 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 M is dropped from aheight H above the ground. Th0 voz8 s)lv7clv1c *vxe object bounc o 0l szv7v8*cx)vlvc1es 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 with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the cords*3afwwj.x0mv 0)z dk makes an anglam)0j k0sxfdw*w3 vz.e
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 jnimgeucsv51 pjqc-9 05e(7geko*p. angle. 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 sta5j c.90ps( kegjvepci 51gu*nmo -e7 qrting 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, alon( ic: v);yy -b8l.bvt4bvlc lqt w(4eyk7rcm1g 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 the deliveryman on the cartons to move them to the loclc;ll bbtm(-ye7y i8)w4( 1 v q:t4vvybcrk.ading dock?

  12.16: A constant force F=50N (as shown in the figure) is app3cu znp7kvdk-)mn00 0qe:g -gh2h upklied for the 6.0 meter motion of the box upward along the incline. The mv0dk3 0)zcu2 g-hg:n0uneqkpk 7h p-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 fromx8ua8e m8+aa 8cm jz9r the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A str8 am+8uarx889a jezcmikes 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 an i q h.52l;twsm4f ayxi+a92u lfnitial 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 heightm;fh2wflq9ax+y52 u.a 4sit l does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stru) c3dbv z*.fx8r;sv wk7jcdh0a vj;7etches a spring that has a spring constant of 20 N/m. *v 0d.vuvwjd)s 7x3j8z;; b krfcc7haThe potential energy stored in the spring is:

  97.10: A compressed spring h j) 7gmbn* -(rahjxbq olbp/p ou2)s-+as 16 J of potential energy. What is the maximum speed it can il o(n2b)bjhp a squp+r bx)-j-/ *7gmompart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest ag sj1f- dym7f1t 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 ford1-m yjf7fsg1 the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.