97.01: A force F directed at an angle of θ above the horizont9j(7yjz.dh ,h5j u iwwal is used to pull a crate a distance D across a level floor. The wohy9w5hz jjiu (d. w7,jrk done by the force F is

  97.33: A softball player catches a ball of mass m, which iu w -.zoa7ab4zs moving toward her with horizontal speed vwb.aza4z 7-o u. While 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 holds a 20 kilogram s+.ct jt.3gvslheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow muv3t ..c gljst+ch power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratiox)rud+s2g0 baz -. orvn on a horizontal surface for 5.00 s. The block’s kinetic energy strico+- x2ugs0b )azrd .vrtly 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 sf p-3jvw9: 1tumjz q;acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases f3:svjpuf19jmzqw t ;-rom 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 foa/l t)p rvvbiizq+w);s4y/3trce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was wb)/ t+pv/ziqrtyai43ls ;v) 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 dire;wg n-y8o:nkl:om b(z0k xwu) cted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides o mx ):gn;y :-b80wlzuono(wkkn a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at restoovo tke srrd +4.36d:n,o h3xnn a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the d:e v3d6nkooxho r .+srn4,3tstudent 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 e:c rnngjx4m(m2 va 9h4nergy. An hour after the fan has been hm9:g4nn(2mxj vcr 4a turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blog8f-u 1uhcqia3v3fi 6ck of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an3iu i uhffa1 g8v-6qc3 acceleration 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 madie ax s3(6ngna4.az )f0i2g from the 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 ha i6n)aiax4a z2g3n 0gsa .d(efs a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 6h2 61dvkggkp32 horsepower) of power to a car's driving wheels. If the car maintains a con k216d g6gpkhvstant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right)bkw q3gm( 0xv, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. Th) (mgq0vkwb3 xe 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 right, a box moves-0nf 9ya1tzub with speed 5.00 m/s at the bottom of a rough, fixed inclined plane b0futn-y19az. 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= 20.0 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 rmss mon- 6g7x y:nkcohm(+ n5.ight, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has t5nmc6ns:y.km 7n-(s oox+ hgmraveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the tw* vl5rvoa04,d gyrtx ).eo0oime interval of the ad)5ovv ag ot*e4wr.y0lr o,0xcceleration?

  12.08: Through what distany t 1c+ vsbiba3)cv8i*+d ahv5ce does the object move during the time interval of the acceleryv ib1a3c8 h+tcsd )avvib*5 +ation

  12.19: The magnitude of the linear momentumfwy2 qto n kiu+4p5j5:jti8i ) of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in iujw8q:)i+titk j5of yp54 2na 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 its speed is increased f6f ( yi1n)n.dkpnar w5mwf/9 trom 2.00m/s to 4.00m/s. Which one of th)/f rn (n5kw6i9fdam 1ntpw.ye following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used:4 r3q zgsi.pzk ex)s5mh: a+h 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 μ. The work done by the frictiqhx:p zm.s s ezk+3a:r5h4 g)ional force is:

  14.31: A toy crane exerts an upward f,; gghjlbwq ci (t5sp/++7yzeorce and delivers a useful power output of 0.10 w to raisj+wgl e5y i(/s +qcgh;7zt p,be 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 the surface of the Eartho/gors8l7v (po 6v6q*z isv;a , 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 am(s l6; zigvp7v/or a*68o soqvount 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 height ho a: if/ns,m iz(ibove 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 the total energy E of the ball afmi :n,i(i sz/nd its height h above the surface?

  07.06: A 500-kg car is moving at 28 m0pqpv8l:: f,avhro 55.v vtfi/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum avera8a ptv5:0ol .ff:,h prvv5iqv ge net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. If 0 9yhddv wg))gtk6jzs; 4,nq tthe ball travels 15 meters, what was the average net force applit0)wgv hd4q9g;dktjnyz, 6 s)ed while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses bucb3 -vps hov)2t identical kinetic energies and the three following statements. Which of the above statements would be correc2b3ovp-cvs) h t?
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 vertical. w.ff0 zd.l/ks6mj,vz.qgpsly 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 itlsz/ 6jz.qwp f.d.,0kvgf.m ss highest point?

  06.20: A boy jumps from rest straight upward from a flat, st*5 omai8z 9p/. rlmconationary concrete surface. lnp* 8rcaoiomz5. 9/mThe 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 gr6 wuu (arezz5o) f(bv+ound. 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 ground on the object+fv(be5(r ) wzuu oza6 while coming to rest?

  12.48: An object of ma0kwf u-9d 0 a;ipulxu*ss 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 height H/2. What was the magnitudeui k-fp; xla 90w0u*du of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord qhbwg:6g t5c7qq2 q; flength L is pulled sideways until the cord makes gtbcgw5:qf2qhq76q; an 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 angle. The sled, which z (-m4)xejjy/ab 2m :f)ooff8eunv +dstarted 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 down the hill. What is the sled's speed 8 f)u)- d nvfyfxmm+aoj2/ (ob :eez4jwhen it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-4,m3b 4dd1 o2tdxnzdz 3az4humeter 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 loading dock?zon 1zm 32xhz dd,batdu43 4d4

  12.16: A constant force F=50N (as shown in the figure) is applied for the 6 -zdv 3l:r3cwc.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choice:z3-lwv dcc3rs best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are ea4pbo 7e8j vri1ch 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 rije8po1v4 b7the two balls changing?

  11.28: A person throws an object of mv 2e8/sz9zco)4 8 :tcxfd quzxass 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 objec /tfcz9d) 4 v 2x:q8x8ozcesuzt of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring f.w/o:pr v mcmfn;y+4that has a spring constant of 20 N/m. The potential energy stored in them frf+ y;.p/:o4cmvnw spring is:

  97.10: A compressed springcob/z b outn6:rc3f/y;x .-g y)g 8eah has 16 J of potential energy. What is the maximum speed it can impart to a 2.0- a:.6 ugh3;) ycbtc e-y/zonf/b8xg orkg object ?

  

  10.31: An object of mass M start(ea ejqr77,wz s 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 speed7jeq ,rewa7(z 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 kinetic friction between the incline and the object for both trials.