97.01: A force F directed at an angl3dd/: l)l nkh.jl/cnte of θ above the horizontal is used to pull a/kcdh/nd 3jln .:l )tl 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 maz au d(3*b r7*qsdkk37 oycby4, 9x9gsqgskp+ss m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant decelerat7k,d 39rxob*7ssq9ky + g4s3qdbz(pk cayg* uion, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer*l epb3rv+gt h096zncelm n82 holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During th+30 2c 9lntrbg8vem* h lpze6nese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horicr(-nwywqy,;8 (bcmg zontal surface for 5.00 s. The block’s kinetic energy strictly decreasey w,c( b-ngwy;8qr(cms 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 accelerati4p pn.2,tnduvon on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J i 2,pud.np 4tvnn 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 forcm )g1 t6 qb3a4/oizmmo)t 9hide 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 horitatmgq o/dhb9 m)1m4 6oi) 3zizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net foryw2 a0t)qp ostd 8f4o)8 (lzof9 o(rghce directed to the right is exerted on a 3.0 kg block for 5.0 s. Theszf)((yolpoqgtdf2 8at8 o )rwoh409 block 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 initially at reston a frictio r-oksgk0c 7w1fms 1g(nless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the studec( s kgsf-10w1gorkm7nt 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 af:),b)s a)e b0ensqw4a htz1qiter the fan has been turned of1ht zqew0sbias)) :eq 4anb,)f,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a uu2mxn u,97sjposition of 3.0 m, a speed of 4.0 m/s, and a,xumu7u2 nsj 9n acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old ter57l,r4asrdh gd. cj :xtbooks is on the middle shelf in the bookroom 1.3 m from theah c:dg74r. d,l5rj sr floor. If the 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 engine delivers 24,000 watts (abay27)gepwq/vzhp z : /out 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 force acting on t yqvh 7epw)a/2zpg :z/he car?

  09.13: In the figure 9io0 n,tq*tzrto the 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 of tn0q* t,zi9 otrhe 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 g m)kjygn-1/s 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 of F = 240N. The box, of mass m= 20.01j-s / gnk)gmy 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 vvu*c)mzb- c /1h: cxhj9,a ryj;tg5vroad. 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 iy hjmvua-*ct/1, h v;)grjzc95vbc:xn terms of B?

  12.07: What is the net force acting on the object during the time inta;nt2tj. xrr 6erval of th .2njrt;6xa rte acceleration?

  12.08: Through what distance does txxy:q1 :jt2g/8akijz.sp 5lshe object move during the time interval of the acceleration k1t:yplsiq.:s 5 /2jjz8xagx

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chanfnvl *zc6o( lz*r 5ig)ged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kir ol f5zgv*)6*(lnzc inetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J x6u;m e4lhj1:widvb/6f 8u 25ig eoblof kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one oo6 dfgxi8e15eulu:i4v b; mjl62b/wh f the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal i tz-1yhk+jd9p9 u/nwdc4z x5ns 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 and the suitcas u5dtnd4yk9+9znc h p /-zxw1je is μ. The work done by the frictional force is:

  14.31: A toy crane ex+mv 1pr fil5w6erts an upward force and delivers a useful power output of 0.10 w tm1prwliv+56 f o raise a block vertically 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 from rest near mgy h)b.;zh-fthe 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 foz y).hghb- fm;rce acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor ansk(-3p o 0mkrev0r.end released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total0.vsnk-03po(m rr ek e 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. u 3igcw+me7 lvh z60zj/9kg7bIf the car takes 95 meters to come to rest, what is the magnitude of the minimum average net f7wje /k0czi9bv6+ 73u lggh zmorce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uipavkk -9a8(m 6vcri/niformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to amva /kkv(i6r 8c-p9 ia stop?

  02.26: Consider two laboratory cartdi5 eim +(3akzn pkcp:/(j,lrs of different masses but identical kinetic energies and the three followi(j: pkelrdac5k+zpnm /i3(,ing 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 vertwd+7wc*tq 6xy ically in the air with an initial speed of 4.60 m/s. Ignoring air xq*ww t+cyd76 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 yhh ** sdf:og6flat, 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 *s*6gf:hdy o hmotion. 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 masresu:,pw9 :ivked,)50c4h ev w gp k,ss M is dropped from aheightH above the ground. The object crashespu e,k cpg4 )k,e i0 svrh:ewv5ws:,d9 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 ground on the object while coming to rest?

  12.48: An object of , p1dnebu y9 dq8yzo-)mass M 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 to a maximum b1q o)yd 8z9,e-puydn 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 g;ioipa s-4wg zcp3a5 0zbq--a cord length L is pulled sideways until the cord makes an anggi paaws-4p0;5izzoq-cbg3 -le
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 uni+ b bwlblh dv)d2ar,9.u.p :tzform incline of unknown 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 starting position and mtru walbb:+h 2 dz b.,vdp.9)lomentarily 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 sidewalkq)n x2uhim6. g, along a 10-meter ramp to a loading dock, which is 1.5 meters above thi q mu.2g)nh6xe 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 appi psm: k6h,s2rc6q, t5zm1iodlied for the 6.0 meter motion of the box upward along the incline. The2 rt:1imps 6m ,5,6cd sqoizhk 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 fromagnl h7)4wpy3j-yp.y 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 the two balls chaly. gw )3-7nhppy4yaj nging?

  11.28: A person throws an object of mass M straight upward with an initial no jyfce1n(s *6bn-zero spees6c *fjb(n1y ed 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 air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant n;nv4sat. bpys:40yvof 20 N/m. Ttss;ynb0a.:vn ypv44he potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential ene1e m7zht(qm3p, 1nd.wpav(um rgy. What is the maximum speed itqad1nh3mzme7pt1 u. ( m,p v(w can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from resuq* 5y/e2v abyt 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 compare for the two trials? Assume the same constant non- zero coefficient of kab5v/2*u qyyeinetic friction between the incline and the object for both trials.