97.01: A force F directed at an angle of θ above the horizontal is us)p l5vf80k ; ozpz1eqyed to pull a crat1klf)qv5zz y p8op;0ee a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a bawz3,cm 0llbb;e c*e-q n5 ivob,oc7k:ll of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontaqc-5 : 0n, 3ek* ,l;ovblbzicwe7m cbol force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter jn2bq/: r+ gk6pumu (labove the floor for 4 seconds. During these6gql/+ b2(upkjnu :rm 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration y/yafy/s fqghkf t26.+nwx8; tdkv37on a horizontal surface for 5.00 2tt/qs wh6.;78k a y+ fkfyvy/3fgxnds. The 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 horizontal sm5p/cg5 xob+df ztj *j6ro-l2urface for 5.00 s. The block’s kine2jodgt6mrf l5/xjb+- pc5*zo tic 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 directij1 vrqhfs93 (ed to the right is exerted on a 3.0 kg block for 5.0 s. Th3 srhjq19fi(v e 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 to the right is exerted on a 3.0 kg blogb8g 8pqgl:(xck for 5.0 s. The block was initip8 :g(x8gqlg bally 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 frictionless frozen pond throwu;: lcijgx o0w(j 7qwyk 7,j0zs a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction whiiqujjc0 k0z(ogj ,w x7y:l ;w7le 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 kinetic enerp- x2;s4 nhzpigy. An hour after the fan has beensh -;xp2i4 pzn turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0 m, a speedp8a -s2l jkrlq1 45y:eyeae .g of 4.0 m/s, and an acrkqy2l5a8ge4p e l-jy .:a1es celeration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old tfgi5 y6qxz2o3 z,jy4 cextbooks is on the middle shelf in the bookroom 1.3 m from the fl 253ycozz q64j,xiygf oor. 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 (about 32 horsepower) o7pa* 40 gasnwaf power to pnag*0s 47aawa 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 the car?

  09.13: In the figure to the right, a box moves with speed 5.z.sz; uvw8n*m00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the zwmsv.;*u zn8 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 tlwb feih, .xyp1iw69t9 --ncfo the right, a box moves with speed 5.00 m/s at the bottom of a ro 99p1i.-nf etixbwyhc lw,6f-ugh, 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= 20.0 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 t -d lni7b,qlo.o the right, each starting from rest, along a straight road. CarA has twice the acceleration oq ,obl.l id7n-f 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 ac0bw)1v l lfo/kting on the object during the time interval of thel/0o1 ) bkvflw acceleration?

  12.08: Through what distance does the object move during the time a3kcw40,lgczlfp+ 2l)e6hx/xlot z6 interval of the acceler4ozk6lz/ec lllx +g 3aw, hf62tpx )0cation

  12.19: The magnitude of the linear momentum of a 4.0mhvn 0cp4;a 8lj zf:ofyjps c(4z8r +)0 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 change in the kinetic energy of the mass during thi ( nz zvjflp0+m)asf8c:r;p4yc 4jh o8s time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increase 3x)vwl+d.kh.w9lyn d gwj0r5d from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crv 0+d g3lw5.jwx.k )yd 9nhlwrate

  94.38: A force F at an anglftd t- w-0us4ku5ub1n e θ above the horizontal is used to pull a heavy suitcase of weight mga distaf- s1 wtuknb4uud0t- 5nce 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 an upward force and delivers a useful power outp2k /eh ue8/: ):dy em+eotv3fambf+ya ybb/v8ut of 0.10 w to raise a block vertically at a constant speed. At what constant speedembe )u/a 38/ov+ve: fab:ykd y2 fbteh+ m/8y will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest neapybfpd: ( e/23t ftd1dr the 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 chodp ptd21 dy:ff/3et( bices 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 height ho above a hard floor and reymp2e6, j3 , jrvun;vbuwv56n leased. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy un3mv,6;uyvj6 e2jvpn b,r5w E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. Thenf*4x+iai*(ll fo3 9acmd8 je driver sees a barrier ahead. If the car takes 95 meters to comeijlxlen a f coafm*4 9i8(3*d+ 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 ;ug,3-:;z mnjds scc kuniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming d3 k-uc:j s;z sgmc,;nto a stop?

  02.26: Consider two laboratory carts of diffe*-n +(a ,os o2bxxrbphrent masses but identical kinetic energies and the three following statements. Which of the above statements wb+nbsx*,oh( 2 r-opaxould 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 vertically in the air with an initial sp)uc (en6i6sux2y t .rieed of 4.60 m/s. Ignoring air rei6tyi ur.c(u2 )sx6 ensistance, 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, wy of98 o*k4pzo :z0ezstationary 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 aveo0o*kz fzy:w4e o9zp 8rage normal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of maougw xy25r+* kss M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to resw k2r5ox yu+*gt 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 a(oi:g5cf,p9q l ( eaupqm.z7fbove the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a m,(e :gl5qopp.mifu9( a7fcqzaximum 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 untitaxedj yxz (pvbo(3-. 9-py s9l the cord maky9z3o v xd9p -byea.(j-s(tpxes 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 inclinekd ztaj/w78 ;r0*d11v7shweyt xfo*m 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 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 thea1 t k7exv7jd h0y*rdfzm*/ s; 18wtow hill?

  06.09: A deliveryman moves 10 c)6 8f8duimf vjartons from the sidewalk, along a 10-meter ramp to a loadin mff 86ij8vud)g 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?

  12.16: A constant force F=50N (as shown if2xofu*s(4 lm8r1ej in the figure) is applied for the 6.0 meter motion of the box r u( f4fi28oje1m *slxupward 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from the tx:n6 )n 6vjz)vc ftr6 8t-jbdeop of a tall tower. Ball A is dropped one second before ball B. After ball B is 6tdn: 66fvc-v)jrt z8)bxjne 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 u(z.xw4 +mzjf epward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The persom.jz e4z xwf(+n 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 spring7wf6yj 1ussp1 that has a spring constant of 20 N/m. The potential energy storeyp61 j17sufws d in the spring is:

  97.10: A compressed spring has 16 J of pot9x/0136n(wm , fadvkauxlbwab n 3,h tential energy. What is the maximum speed it can impa ,ww6x buhvladmxf 30b13/n (kt an9,art to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the botto: ) dwwbq 04yzug1ce5lm 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 th4b wwy:0u1)clq zeg5 de 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.