97.01: A force F directed at an angle of θ above the horizone0cpu7 b g03bg+z2ds otal is used to pull a crate a distance D across ag ub2bz3 ed07 ocs+g0p level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward herc(7 *rko5 nc6w4jt581a dmtwze9t pk c with horizontal speed v. While bringing the knjzd 4pr*wwt 7kt9ca ot 5(m615ce8cball 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 holds a 26l8ckc/a 8/djjo +ad jvj614n d2wkum0 kilogram sheet of wallboard 3 meter above the floor for 4 second daj6jnjau2k ocd/j c6w l1k m/+4v8d8s. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block 72k a 1xif7qwe slides with uniform acceleration on a horizontal surface for 5.00 s. 1ka7fi2x q7ewThe block’s kinetic energy strictly 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 block slides with uniform acceleration on a *wmp ore- p9qx1esb)-horizontal surface for 5.*b9)qsx e-e pmrw p-1o00 s. The block’s kinetic energy 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 f: .s a(h0bjgkdirected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rh(f 0b:as.jkgest 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 p tqw35.* 3mbvkgv9noforce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest andqo v9p k*n3 mt35vg.bw slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student iniuc obl+4.1i+ om uwf2qtially 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 the other direction. Which of the following correctly describes the aw21ucmo4+uqbf+il o . bove situation?

  03.14: A fan blows the airjmy+a6l8/ i zy and gives it kinetic energy. An hour after the fan l/ymiz j a6y8+has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant -e-io)e/-.9pj0 atqui6g x*pgbpfmkgs p70o, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerfpe6 aku gq)tm -/0ox9*piig g7 -p0.-ejopbsation 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 ixmhp -5 il-y*the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that m5 xyi iplh-*-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 2bv2*8o.c ov faevxqo.,i+n8 w)l;ned4,000 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 thdwxeq*ba,oo +l;v n8 ) i8evon.2 cf.ve retarding force acting on the car?

  09.13: In the figure to the right, l ps+k 1gp:3+vglkcd6 a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. T+ldkspk lc+1gp g:3v6he 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 incline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the righ2iiaa(x/iiu(i (r +8*jannpdt, 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 conri ix+pni8(a (unad/i a(*ji2stant 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 ro7shtq9p j9zabgc3 3 (est, along a straight road. CarA has twice th3pqhtosc aj3 b(7g9z 9e 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 durih(ub0fbuxgv2 * s(/r rxaa4.ing the time interval of tharuuib2g fxh( abr(v.s/ *40x e acceleration?

  12.08: Through what distance does the object move during the time internj0 3mp sbrze):iuh ;:val of the acnz;p 3su im br::h)e0jceleration

  12.19: The magnitude of the linear momentum of a 4.o a7dbop0ua(4aw 9d1v 00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6a 4ddau a0v 97pow(b1o.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.b mk )f-nnr8n*0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the m nmf)bk- r8n*nass of the crate

  94.38: A force F at an angle θl hp6 (lu1l;j+iv/ f)je acu8yes,fj:*3n t en above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficj hef ey,fa(ul; pc)t/l3ju+n61vj l8n *e: siient 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 upwarakg cyj uhod6u4b3-4)wgd4 /ra e5j 6td force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what conjy/db46rt au 5gokwg3 dj -c464u)heastant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is ru64b8o6vji0 u 6-0 mhhfgs eyveleased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the E yvubfuh j-6 ogh0 s4mvi06e86arth 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 motionless a he pd;1ix y9tcr(ight ho above a hard floor and released. Assuming that the collision yr 9(d1x;tcipwith 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 barrieooyyw(+ xq m,8 ofd+c.r ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average do fmy,.x(q+ o+ co8wynet force necessary to stop?

  00.26: A 500-gram ball q5vhhi+tqtq:1w ahc. 9;3biomoving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while c: 9 a1;+htqi .qho5tvqh3wibit was coming to a stop?

  02.26: Consider two laboratory carts of differe m0tex a094uqdn32t ipx3c3u xnt masses but identical kinetic energies and0aq4uxtcx90i n33eupmtx3 d2 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 clay is tossed vezodpfr*z7.)2 , tcjn lrtically 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 rdn2 oft *rczj, z7p.l)eaches its highest point?

  06.20: A boy jumps from :tt ch3zkg wdp7ww04 25tmly(rest straight upward from 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. Htgtp:wl 7tymh 3 c0d5wzk4(w2ow 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 droj b1(tvbg*c afx0x) jhq*o2h1pped from aheightH 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 magnitude of the average constant force exerted by the gr baq)h0 1*jxbf2 *x1cjt(ov hgound on the object while coming to rest?

  12.48: An object of mass M is dropped from asknppyt h8ca0)v-;i( ion t+(height 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 max ;oacii+0thk( p) y-nspt(8vn imum 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 pull7y9aq *svj )toed sideways until the cord makes avya o)js* 7tq9n 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 aenn /:knq7h wr sp- no8)v3-a2 ;dmofsngle. 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 rest. The sled then slides back dowfknq ;sna2wo 7):-o-vn/nmr 83hdse p n 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 cartonsw9u jxq/kr .n/ from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.kr./w qnxju9 /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 loading dock?

  12.16: A constant force F=50N (as shown in theoh b-gcmkz,d8+ ow02 p 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. Whikgbz ,c+o02mow h -d8pch 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 ew-e ,.w xgkqpms h.xllrij)jp0-(c;5a ls m6*ach dropped from rest from the top of a tall tower. Ball A isxx(i)wc mw;-*k5lpm,e-.0hsl apsrj6jq l.g dropped one 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 anivbxyi-f4.jd15 elbfmru8 6 am 0s 1/o 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 2vmsfje/8v xm14y.b5ro -l1bf0 6 i iuda. In terms of H, to what 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 825eoyzvt*:t sxrx2h spring constant of 20 N/m. The potential energy stored in the spri2zxv e hs2x8*y5:ttr ong is:

  97.10: A compressed shl*r60umv5* lq yx,hu pring has 16 J of potential energy. What is the maximum speed it can im50r,lvuhlm6 y xh* q*upart to a 2.0-kg object ?

  

  10.31: An object of mass a93 6opca uy3jyuu(0o M starts 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 theaco0 a(puj96o33uu yy 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.