97.01: A force F dir-g9nv er:06cuwm0x6lhq w1jlected at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done b09ngq6l6 u0 ljm-: c1hwxvrwe y the force F is

  97.33: A softball player catches a ball of mass m, which is moving towardzf8 b qbam,od+f w9, .o p493anqwul3g her with horizontal speed v. While bringing the ball to rest, her hand moves back a dif wfpwlm g ,q8n.b4+o oq, d9a393bzuastanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 p3m5 tn qbg0zu,mxwu5t14p0mmeter above the floor for 4 seconds. Dur3m 045 pmb5gux wmu0tq, zpnt1ing these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizonta *nkta;j*4xi ,nscbg b74t6 t+(bttdnl surface for 5.00 s. The block’s kinetic energy strick sn ni7tb*jt at6gxbtt*44b +,(;d cntly 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 unifo h6;now;a mu7hczg vg 0w*ty(3rm acceleration on a horizontal surface for 5.00 s. The blochh7;ugm3*cwog n t0vzy 6a(; wk’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 directed to the right is exerted on a 3.0 kg block zjqk t 45i5183p.gvym xg*n shfor 5.0 s. The block was initially at rest and slides on a horizomjy zx 4. k5qn8tpgs1 v5ih3*gntal 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 block ftgpiws57wt: x:iq,2u pf5o v/or 5.0 s. The block was initially at rest and slides on a horizontal siv t w:if pow:2s5/ pu7t,5qgxurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a fmy7y ,hp*ad3 le fng.8rictionless 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. Whilg*peymy8f n 7a3h.,dch of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energyd qe7bka(;4i,*xcl gh-krv jq.bn + b/. An hour after the fan has been tb(-/ +bk,q;cvbx7jnr*. eqa gl 4hidkurned 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 positio2xmr e.ymo) e/g /zft9n of 3.0 m, a speed of 4f/yxe9zm/m) ro .2egt .0 m/s, and an 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 bookroo afwp(7w)cn+ lm 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work dowp(na+l w )fc7es he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine 4uyf+jlu7kyppqt6+* delivers 24,000 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 the retarding force acting on th6kqjlp*p+ t7 +yu4yf ue car?

  09.13: In the figure to thp;+3/hcbjb0 :uhfi8 iqc sk7oe 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 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 i0;73hjusbb+ck c/hp if :8qo.
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 mo7pv6*jn feh.bves 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 inclinef pvj*6hbn7.e 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 (4moedf illif- kc/e(51z 8wxto the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After travelingfi1ofld(8w4 ikx (/emzl-e5c 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 f,3bya z1wtz)xorce acting on the object during the time interval of the acce3y)wb,z1 tzax leration?

  12.08: Through what distance does the object move during the b2 erfc* u3fi1ff3jz0 time interval of the acceleratiof f u*e 31f2fizrjb03cn

  12.19: The magnitude of the linear momentum of a 4.00 kg point masx dm( .qv;sl+w.8 qlkntyfb0x24f c5ss is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s2vlsnsl ;(kf0dmx+qxy .tfcw4. 5q8b. 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 fro 3tn:vo3npyd)ly 878rh vx hr8m 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of n:yovpy7)vr8t 38lrh 38ndxh the crate

  94.38: A force F at an angle θ above the horizontal is used to puyrg7kj/4ivp 8ll a heavy suitcase of weight mga distance d7jgvrypi/8k 4 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 aluj3xfape10 5 nd delivers a useful power output of 0.10 w to rau 5ja01p3lex fise 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 Earth, th +o du d7fbi3)u+yq(ike gravitational force ackd+3( foq uuidb7)+iy ting 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 object during the fall?

  96.18: A rubber ball is held motionless a height ho aan63w9y;a i hbn-knv5t (skx* bove 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 and its height h above the n-aan9; 5tyi* k(kswxn63vhb surface?

  07.06: A 500-kg car is movin s8v k/9m2pxwng at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stvmsk n 8/xp2w9op?

  00.26: A 500-gram ball moving at 15o) w0imhjp,9 a m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whilo awim,h90 )pje it was coming to a stop?

  02.26: Consider two laboratory carts of different madf x:,ty 9p1)kpjvt4h9p3- fptstw (e sses but identical kinetic energies and the three following statements. Whic3pdt wph fp st9-9pttefy)kv x, 4j1(:h 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 vertically in the air with an initial sp5yszfhyj431 wkctjg -s yzynl3 72s9 1eed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy whe 1gf5yhnj4k7 t zy s y23wcz-ylj31ss9n it reaches its highest point?

  06.20: A boy jumps fromm1pfw7imjtqk8:p:;fg8 s; gb 5q* tuk 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 m fpgq;:: mu*88jtpq7gbiws5k f1 tk;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 abo:7 a2r) iar8ct :0tdrtklr;2hgv y 6wwve the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that airarwygdt8c:iwtr 2; r )h72lv a6rk0:t 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 em3 qxi6bpjsrhcf2 m419 36fjmass M is dropped from aheight H above the ground. The object bounces off of a horizf2cxpjfr3 i964sqmj6b1 m3eh ontal 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 during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways unlb6tf9huktr: k5 x+zib+w5/ otil the cord makes u59oxwbbltt/rk: z+i6kh f5+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. Thefg2k a ) :n50vt5cgzaipocv5f1*y, xd 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 posifc,d ayan vx*gk 01o iv5 )cfpt5:2g5ztion 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 cartons from the sidewal qdbr7 yq/b:fnd063w6qt:l phk, along a 10-meter ramp to a loading dock, which is 1pf:dly3/: bbq6 rqt6 0qn7 whd.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 the figure) is applied for1*z9kom 3slewpb b q 6y+4nxrvmb*6o: the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which bmp w:se 314 o9qv6zo+*l*m xbybkn6rone 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 eh)cy z*7 geky si1o8x1ach dropped from rest from the top of a tall tower. Ball A is droppeyxc*o8isyk7e 1z1)g hd 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 a8nl5*w v c/ -q(cxwvagp(p.enn 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 straigwlp*5cea(-gc n8/ nv.wqvx p( ht 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 of 20 N/cku2 zavdwj-jux*9 9 ajf25.gqib.u (m. The potential energy stored in the spring . cuuzj92bwgf.ud5 a(-a x9jvj qi*k2is:

  97.10: A compressed spring has 16 J of potential energy x9 i/thou,s2r5l6x xl. What is the maximum speed it cat,lxs9l6x o5 x2ir/uhn impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline ol*gt q.j7xp.z f 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 kinetic friction between the incline anlqpg .x *jz.t7d the object for both trials.