97.01: A force F directed at an angle of θ above the horizont v+y7 y2h20vi/f psrpmal is used to pull a crate a distance D across a level floor. Th2 s vvmyp2+iyfh /0pr7e work done by the force F is

  97.33: A softball player catciava y pewt;0.)mc))y hes a ball 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 deceleratwaai; ep)c.m) )yy 0vtion, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer h83vn;s ng+2zzex+cuwupjn+ l e 5j +g 693snpiolds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 sujuz9p n;ce2+pn j + nvl+5+3i8xzg 6nws3s egecondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerat0x bc0wyqvlc q9mj+9,ion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thij0q9mqc lvx,y9+wb 0cs 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 su k ;8-ufuwuwo7k e+18ebd oml 4d8tkox q.47ckrface for 5.00 s. The blkm l k 4.e14ddxoc+wu78ub ;uk 8- oktoq78wefock’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 exerte.4wepu)v zna r8m8aa .d on a 3.0 kg block for 5.0 s. The block was initially at restr a a.u)84vzne.pma w8 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 58 o 2vcd7ao4sfgp6 ezright is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizonte4 p2v6 g 5do8caosfz7al 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 throws a 1 k;1n x/ f8fffr md(bpgnm+5;olg 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+8 p mf/ 5bd1gnf(r nlmo;f;xf the following correctly describes the above situation?

  03.14: A fan blows the air w9 mf( mz5ejuhj/qiqg x. j150u7mh9wand gives it kinetic energy. An hour after the fan has been (ujx9wgwq7juezj5f q510hmi9 m. m/hturned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a u7+lzrm;f 7-cmtqlj i ;0wwd :block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerat-7wczmj d+m:7lu0fq;l;rwt iion 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 i +po: yr..jz9g2paqdyq j*t8mn the bookroom 1.3 m from the floor. If the janitor relocates the j *py.. d ma89 :z+gyjtqpo2qrbox 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) of pow5th6( r9 qgq6fzvc(bi er 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 ob((zicfgv5hr6 q 9q6tn the car?

  09.13: In the figure to the b+ coj a+xd 5(t,zthk9right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed ia5z,t +jdthx o+k9 b(cnclined 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.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the right,tc; 0z,4r6 alecawu 9o 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 th9a4c;tw6azr,0 eocu le 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 right, each starting from rest, along a stra glmlb+l:np8 y/8zxo2 ight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the sam/ x2l:yogblnzm8 pl8+ e distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time interva*zd ;0wgmpuuk3n2vo-vo4 e h. l of the acceleraoh dvuz npm.- ; o34uk*wg20vetion?

  12.08: Through what distance doesnu5vs m:b6nl 4 the object move during the time interval of the acceleras6:u n 4n5mvlbtion

  12.19: The magnitude of thechu- qf3yx-*i linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What iucq fyi3*-x h-s the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whit6sxguu2n ,uthgd84 y*k bi*cem/5cu4.e 3mble its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best repuutci u/ksgc*d43he6. 8, n*2mb 5g e4x btumyresents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to l ::7u zcwkcf;tz h.xt0pc-c-pull a heavy suitcase of w-:h.:z tkp ;x cf7c 0uczc-wlteight 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 frictional force is:

  14.31: A toy crane exerts1,qp i728 x e2t xu;i5gefwuwy an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constan21ft;qeiu,5gx2 wy 8p we ix7ut 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 E.8t;g +tcfkd5wsh3j;fd6qcq arth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the object as it fallsch;dks.5 6jgw dfqf+ 83q tct; 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 n9slobiyj 3p89q . 1rnmotionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between8piq3l .ybnns9o9jr1 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/4s y6fbjp: k/v/i;l *mgs0qyms. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the mini jv:mqis k/m *fpb04;y/s6lygmum average net force necessary to stop?

  00.26: A 500-gram bal5/rl u)sa vq6il moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a sto /5vuql6 ais)rp?

  02.26: Consider two laboratory carts ofefu.(oa h: qwh)u6(vsz2y4 un different masses but identical kinetic energi(s2 6uhaz.fu nv4)yohe :q(uwes and 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 i4wy. ol 0ydqm7s tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change inwo l7 yd4qmy0. its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete s o );.-3bj enyxbm bvcse(0/kfurface. 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 physicaex3s) fmy -c k.ov0n;/bebb( jl 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 a1t)dr 8j//o;o cnre upheightH 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 ) 1pcreuro/d; 8ojnt/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 above the ground.0vr-, +,gtvqo7x fwum hh9p6-yzil9 r 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 magnitude of the average net force - 9mxh7 rf+0ptzqovw-h9guy i,,r 6vl acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pull7dh jr1a7js q*.f/ he,k fba0ded sideways until the cordqr7ak 1.hd* / ,7edfajhsj0fb makes 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 i)wonbc m6+( gnncline 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 s+n(g)obcw 6mn lides 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 sidewps(e-ur; nhd:y h , pv+gec0f:alk, along a 10-meter ramp to a loading dock, which is 1.5 metersu ph: gs ;fe(n- ,d0cr+evyh:p 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 (n uahu-87nup 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. Which one of the following choices best represents the whn-nuu7a ( u8pork done by the force F onthe box for the motion?

  04.48: Two identical bowliej) 7.k9qdrm oc2hcz;ng balls A and B are each dropped from rest from the top of a tall tower. Ball7; kq2e.ocjhr 9mzc )d 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 changing?

  11.28: A person throws an object of mass M straight upward with an initial vfxhkioix *0 6mob 8/+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 object i +x fmiv6ko*x8h b0o/of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring thuh)8ec1re tf-h j+g+i 1;nq .u6ukvx eat has a spring constant of 20 N/m. The potential energy stored in the spring htr+uc ej vk-nx 6)e+8uqe11f;ui .hgis:

  97.10: A compressed spring has 16:-xh7ph r.nsuk d al(64y lczky04to5 J of potential energy. What is the maximum speed it can ih.yrt: (d0ys4ka l z 4ux-65lch7kpo nmpart to a 2.0-kg object ?

  

  10.31: An object of mass M star9v+wl5 /qqk+zck/(ss6 ub gyzts 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 the work done by the perqsv5q/ wz+(z+6 kk cb9/ylsu gson 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.