97.01: A force F directed at an angle of θ )rh:r hy;muz0x:arn5 above the horizontal is used to pull a crate a dirzh:m:r a y0; ruh)nx5stance D across a level floor. The work done by the force F is

  97.33: A softball player1 ve5ujay(33 pg5-l qv2k;whce b ovx8 catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand mov lh;v(oe15y3 u28a5 c -xejvwq bkp3gves 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 sheetec,/yak5.vk dc6qn r9w0 f(j z of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow munz.kyv/rc 5w06ajce (kd,9q f ch power was expended on the wallboard?

  17.11: A 5.00 kg block slidesbuyb z-w8;u, r with uniform acceleration on a horizontal surface for 5.00 s. The block’s kineticb; ,8buy-uzrw 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 accelerax(8q hs 9y8desq/ia 0uo vuk;fxo456r tion on a horizontal surface for 5.00 s. The block’s 5d/6x94kxefq 8oryva( 0u8 s quo;h iskinetic 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;z hfhd.p-w 0v47rfjz right is exerted on a 3.0 kg block for 5f7f r0 .jzdz4-h;phwv.0 s. The 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 *ga1 j4 ,1 ydjg)qpufz3.0 kg block for 5.0 s. The block was initially at rest and slides f*pgju jgqz4),y1 a1don a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at restoc2r 6xkd/1 e4 tm hoa0l.oi3hfn a frictionless 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. Which of the following correctly describes the above situah t0lf mxhoorad3/i624e.ck 1tion?

  03.14: A fan blows the air and givesu9g r7;zd+ u+l8tzaewbs ,xly0)pa t+ it kinetic energy. An hour after the fan has be sy)+0tul,e 9+xa+zd l;pt78 bgawuzr en turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg h t;4vmtxn/ 0,+*l-hqvev zfpc 6 )yrkjas a position of 3.0 m, a speed of 4r 6 t hl4j/ *+k)ytf-nv 0xvez;cqvmp,.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 bookr t,zfp5jx0;hioom 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 does he do on the box. The box has a massf 5tpzx,;ij 0h of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (abo+d1.(*yhitfskoxxvi 06 p2 b out 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (a2vix(+ o shxf1 y *bp.06oktidbout 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 5.00 m/s at the bo2w xkc0oel-este b c 5bzk 2-p 6,w**is46xppattom 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 = 240p*wxl-- e,*k t paz6x s52weec obbps6 24c0ikN. 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. b(f(lapf2rwp70w 7fj 00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to thp 7lf(brfww2(f0 7pa je 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 straig.t/pfu1) i*kdsv chh3 uio)7ght 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 same disfk gotch1iv/7p3). uus*dhi )tance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time adtt /64fv lsc s1d6q/vc du)qzj9+d9interval of the4f cvqajlddd)t/19u q/+t6dzs9 c6s v acceleration?

  12.08: Through what disman7+wffx7ps g qp 0: ,z--tyhtance does the object move during the time interval of the acceleratw, z+f-mnqx7fpghpa y 0:s-t7ion

  12.19: The magnitude of the linear momentum of a 4.00 ,hl)py9v 3co5) ; tolj 8l9xnazlfwv,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 a9pzj;v9wxt,l3ol8hoc )5 ,nll )vyf this time interval?

  14.11: A crate gains 36.0 J of kinetic gwg7.)9vo:3)vh igf qnpvn+lenergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the followingfiq n+v ol)v3nw: h9pv g7g).g choices best represents the mass of the crate

  94.38: A force F at an ,v /i6 dqrwk*)mihxs 3hhrx42angle θ above the horizontal is 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 sui36)h/ixsd,rqr m2h 4 *kxiv hwtcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upwarhtm .,4c*nedo d force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At d ,oe4* ht.nmcwhat 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 Eartkjn m3*k: +g(fprp/n2xb0aqmh, 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 thefk(kr x+23mpb:n n/gp qmja* 0 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 fl 8pw6dc b1wyu7zk7 b4yoor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship 74bz78ub6wy pdy wk c1between 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/s. The drivex iv(ye5o;ddwm3ltl ).te g( tsfd ),+r sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimw lx()yd5tmsi.)fve; gdt3(lt,e+do um average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly p 1ys kw:6as6tas:xt6 until it stops. If the ball travels 15 meters aky66sptstw a6 x:s1:, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of difflars7rzm ) fu :m;yk,h 96a-rrerent masses but identical kinetic energies and the rammf6ay7lrh u z:,9k;s- rr)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 is tossed v f-txv8jh.)k5 z-ba;sc5lztn*yw of bd/o :s2ertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentiayzs f2/z5 l-.; bahow*nb5f x soj8dvt-t :c)kl energy when it reaches its highest point?

  06.20: A boy jumps from cf l e8rgp+bx32;w(td 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 a distance d to the hpxblf3 d 8 c2w;eg+(trighest 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 m (koehx*g d)h6ass M is dropped from aheightH 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 constant force exerted by the ground on the object while comingh)ox *dg (6keh to rest?

  12.48: An object of mass M is droppujfr7ki pb8 n o-:c6m5ed from aheight H above the ground. The object bounces off of a horizontal surface in a collision 7:o 8ipur56kfn-jc m blasting 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 qx. b0l8zjjk( mon a cord length L is pulled sideways until the cord makes an ankxlqj0 8z(.jbgle
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 sledrwr4cotoj p2,*lf l0 (, 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 the2(l t o4lr,0copw*rj f 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 sidewalk, along a 10-megl2n6mh cqc / *n8ds,cnoc ;d0ter 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 loadin,g*dnn l0s6h/ ncmcqo8d2c;c g dock?

  12.16: A constant force F=50N (as shown in the figuqny885q jd2cf-bgn:zb5zb6 j re) is applied for the 6.0 meter motion of the box upward al g2 j8yq:z-znjd8b55q6bcnf bong 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 ball sfh- is eox*wp5am7 i(3icbuah5++e0s A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is droppedb+*ewmaas- ii3 uphsx +(75f oi0ehc5 but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throw,m w 8bxdxz0d-s an object of mass 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 throdx-md 8,wx bz0ws 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 of 20 N/m. z2 1ntsa3m /q9ol j8vde a6(gx7lmc f8The potential energy 6(lo9a nme8g 28vsx qlf7m1d3tza /jcstored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximks-q( yt1 cqmq jbrt2. /1ec4zum speed it can impart to a 2.0-kg e4sq1tzk / yq c.bqcrjt1m2(-object ?

  

  10.31: An object of mafl*hhc .3)18h hqlb sfss M starts from rest at the bottom of a fixed incline of height H. A person decides to push the object up the incline in * q81slhffbch3 h.)hl 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 and the object for both trials.