97.01: A force F directed at an angle of θ agqx/( : pcej5fbove the horizontal is used to pul/j5 ep fx:qg(cl a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball+ zec* jalrq+;,l:zbr of mass m, which is moving toward her with horizontal speed v. Whqre b;j +r,lacz*+z:l ile bringing the ball to rest, 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 x fk3x hpwca)6q3ltk1 g:fb(l+ j,8ivholds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During thes lph(1 : w3l6 fvb,ia+kqk)tf8g3x jcxe 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform a9nk/udlqb b+(cceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thi kn(l+/d9bbq us time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform accelerabjnn4w ru)) hd1-/sq 4wbhy- vtion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in1y)4q)jb w4hn- wv/rund-b sh 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 bnfn:x--gz -f right is exerted on a 3.0 kg block for 5.z :n -n-xbgf-f0 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 5v,lsu 1c -qkwto the right is exerted on a 3.0 kg block for 5.0 s. The block was initially atlswk -q c1,u5v 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 frozen pond throws a i ;av9nucyh*71 kg hammer in one directi79 an; *ihycuvon. After 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 ki 2*y i0q(m80xblrsd qlnetic energy. An hour after the fan hasl d0*mxq8(0sr2 qi lyb been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, ag+qu7rxyaa tzr;6m1 ( block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accey x 6+a(gu qtr17;mzraleration 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 from99 s02tcneiq t the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does c2qet9ns0 9ti he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepow*kgxj 2zjzp8)oawl( 14 does6er) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/ ej1(8 w g6 2jzzpl)*adokosx4s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to thd,6zohwm/n zv86s * whhh(u 1he right, 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 od*/h ,wsho8 n 6uhz1 vzm(hh6wf 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.j9tpqu z*hn4+lg:ha: 8lvvk: eo7e5 l 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 h tlog8n lh vq:9zv +kua:jle5p:e4*7 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 starting from rest, along a straig, j*.j+ehcl+ja tekt 5ht road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B . hk+j+ a 5ttjc*lje,ehas traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the ob;zd;ym8nfh dywr4a 1:oh-i 0n a7a*ia ject during the time interval of the accel10hn yd wz m4i;r:y*oadian8-fa ha7;eration?

  12.08: Through what distance does the object move during the tig jr xcv:vu0zt)v;w92me interval of the accgvvt: )0u z ;2vw9xcrjeleration

  12.19: The magnitude of the linearpqtq1*m/hcep0me6 a(a l ,b4r 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 chhm10 eqa r*6qlc4( em/ptbpa,ange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spee8 t chmji(6aj hm/1er3d is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the craterchh1 a 3 j8etm(/j6im

  94.38: A force F at an angle θ above the horizontal is used toym,6p)t w-ul x pull a heavy suitcase of weigm u6y ,l-pwt)xht 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 kp45,:,ful)dg d anex an 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 willk l x4gdfpdnu ,e,:a)5 this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surf,m5hgypjx nt 7berb(v-r ,kre.6h21c g:1j uq ace 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 objectgrmgr- pbrj,: 12,jkbyn5.7hh cx( eqv61te u during the fall?

  96.18: A rubber ball is held motionless a.jr h:ll9lsinq w;ly)7(mv6c height ho above a hard floor and released. Assuming that the collision with the floor is elasti;) v mcn9(h:wlsy76 jilqrll.c, 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 ahe+c ruc(uu u(u;;+9fokmjlc b.ad. If the car takes 95 meters tl9c+u m ( fcru+cju (.;ubu;koo 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 slows down uniformly,xgha478alsp qu 3: ge until it stops. If the ball travels 15 meters, what was the averaggs eh438gxa,al:qu7 pe net force applied while it was coming to a stop?

  02.26: Consider two labor)x l;6 imyrx+uatory carts of different masses but identical kinetic energies and the three following statements. Which ;)irxy u+6mxlof 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 clay is tossed verxfmeh69f in.3tically 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 reain6f3 .xhm e9fches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, f3/+ir e.k qm4s)mb*f7nl dtfstationary 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) between the boy’ s feet and the concret*imnqt3d fkf4b/ sl7)+mrfe .e do on the boy?

  02.48: An object of mass M is dropped from aheigh;h3/phq8kvk(3 ifw v ha*5ihi tH 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 miwih/v3 kp iq5h8v;(*kh3 ahfagnitude 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 lnid/ixc(. y46q jl)3:co evtfrom aheight H above the 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 duringlvind(. l c e4joc)ixq :6t3/y the collision with the surface?

  96.38: A pendulum bob mass mon a cors:kll vk5 y(ln)jj96hd length L is pulled sideways until the cord makes an a6jny:lkkhj)l (9 5vlsngle
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,cs22fx xkzu4 pj +ocbvq p 7*)gp(/yq of unknown angle. The sled, which started av u4z /g pxqcc*)p p(2kf7xs2+yqjbo,t 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 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 cartonszs+wa4i p;ropym552s from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above t w p2siy+orp 55z;4asmhe 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 fin9q5rbr/a6 (6d prl . bgvd3jor 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 for 9( grrr3 d5dl6.6av/jnqpibbce F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from xshl)3yfy v+am8* it/ the top of a tall tower. Ball A is dropped one second before ball B. After ball 8xm a3/ +fi y*slyht)vB 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 mir3oec* -qg7b 3t xioc 71nil0ass 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 la33* ilxc 1coeirob0t7 n-gqi7unch point? Ignore air resistance.

  96.20: A force of 10 N stretches 3h1:)jri +)ncld0 fou p3wlbda spring that has a spring constant of 20 N/m. The potential0hd) :u lfj pd br+ino1w3cl3) energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. iwnfzhe bd u,1vin71i+8q8l2 What is the maximum speed it can impart to a 2.0-kg object ?neihf1i8z81u+7 ,dnv2q wli b

  

  10.31: An object of mass M starts from rest at the bottom of w* 4 +y0b3lhibgiv*gya 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 for the two trials? Assume th +40yyb*i g ilg*wv3bhe same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.