97.01: A force F directed at an angle of θ above the -z 7dyvw/ lhtn,(f tn1horizontal is used to pull a crate a distance D across a level floor. The w fvytn- ln/7h,dt1(z work done by the force F is

  97.33: A softball player catches a ball of mass m, (m8ika0 /vjdcnlw +5pfb 11xhwhich is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back1c158imk0(pvd +n/x a bjlhwf 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 sheet oa7kg 5e m1/g 9cnuxzj97 (r+0kfcpf tkf wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallb 5pz0r9 kxck 7ct/1meg(ku+n9 f7afg joard?

  17.11: A 5.00 kg block slides with ue4 ( qmqmy9. ;g oxf(q12zverhruz(*dniform acceleration on a horizontal surface for 5.00 s. The block’q(r(*ee qr. hfz qyg ;14(ovdmum9 x2zs 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 un/fdbl356c vti iform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energ /l5 btvd3ifc6y 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 dir7 qmp h5zlq*r.ected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a ho. pzmq q7h5lr*rizontal 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 tp57bdnd*(:hev)x ao k o the right is exerted on a 3.0 kg block for 5.0 s. The bloekd 7o*(avxd)hnp5b : ck was initially 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 fr 6ye;4vyoem+o ozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while oy6 e;4yvoe+mthe 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 energy. An hour after the faa0zi7.rr kd g(n has been turned ofrz kadg(7r.i0f,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a positq-.f0k1v1:l ol ijus ,t sg;exion of 3.0 m, a speed of 4.0 m/s, and an acceleration of1ls,-;e.vktosi:1l xfq u 0jg $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is ons fd13oa w2uj3 the middle shelf in the bookroom 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 do j2owas313udfes 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 horsepo 36,m baox4qbower) 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 th,omo36qaxb b4e car?

  09.13: In the figure to+ egp0(o7dlsa the 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 t(pa0e 7 slgd+oop 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 with speed 5.00 m/s9nc, sk+b rkm:sd*,e o 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches tr, 9b,*o cmsne+sk kd:he 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, eo av0zz4bfgg.1r )v x+ach starting from rest, along a straight road. CarA has gb zo+.vazx 0f)4rvg1twice the acceleration of 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 forcerh zt8,a7q+ j1xwyiv0 acting on the object during the time interval of the acy ,zajv0i +twhx8 r17qceleration?

  12.08: Through what distpk/a *telk 91zuo 4l3cance does the object move during the time interval of the acza/ 4 kl*op3ut9e kl1cceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg pod .fi u,iwn/-fint mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6 fun/ ii-wf,.d.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 increase3t l2a7u5q kgdd from 2.00m/s to 4.5 3g7ud q2ktal00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horzsh.9fos n*t )gf0nt)izontal is used to pull a heavy suitcase of weight mga distance d alontfzs)90on)nt .g*f h sg 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 delive- xzkc33 pdm,mrs a useful power output of 0.10 w to raise a block vzd3pmcm kx -3,ertically 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 th)w9+-m tbg9yk)i q uxxe 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 choices best represents the amount of work done by the gravib-yx) +)kix9wg tmq9utational 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 aboqq(ysa3j, ,3g v.f rlbve a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relation a .lyjqsf3r3 vq,b,g(ship between 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 driver wywk2 eo4y2*aq 1r wgupod (o86v/uw9 sees a barrier ahead. If the car takes 95 meteyaoq o2 826wk 4rywu*/ 1e(dwp 9ovgwurs to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at :adm kfv:c5i)sfug s)f;a a ss ,/k(.z15 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 sa)dv cuk:s)mi,5:(s a;fsffkg s./ z atop?

  02.26: Consider two l6n*h9qal0km of 4c iwus9n09 o6qul,d aboratory carts of different masses but identical kinetic ener 9hwnmlcof nu6ki*a,4 0l60sod 9qqu9gies 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 is tossed vertically in the air wi1 v0 hh;fya mqj:qph34th an initial speed of 4.60 m/s.a1 hv;4y:pqh fmq3j h0 Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upw h i2a cz+g0;vx-/wahoard 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 hhv- cz;2xw/oig 0+a ad 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 d n,czjjf.d)j 7ropped 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), dc j.jfj7zn 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 ag.4.lvksy *wH 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 magnitude of the average net force acting on the mass d l *va.w.ysg4kuring the collision with the surface?

  96.38: A pendulum bob maa(6gfn rb5a b 0pn(pl+ kbu1wr.3tu 2hss mon a cord length L is pulled sideways until the cord makes an angle n6ra2+0b l1(hb. u fgpua bn3 5ptrk(w
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 sle+04tjoeo h)dpy,yw 1t d, 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 ret dy10eh4toy )woj,p+turns to its original position at the bottom of the hill?

  06.09: A deliveryman moven8e7 hmtf48f 6hy 3/hkdwp 9dos 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mad8wkp6e9f7thyh 3hfm do 4/n8ss 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 ;rfkod2 sracb1-ry/ hq/-;o tapplied for the 6.0 meter motir- 2/fahr rodb; yctq ks1;-/oon 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 work done by the force F onthe box for the motion?

  04.48: Two identical bowling balllk a9z h22:v/zrowpp:s 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 dropped but before ball A strikes the ground, how are the zphp:r/9z2wlk oa :2vmechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straigep3( f7qx (y vt45duler6 rh(ght 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 do (6h(r 4tv75ueqyl gfdxp (er3es the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N ;zvi-sz2( a ( xslbj-istretches a spring that has a spring constant of 20 N/m. The potential energyl i-v2;bja(zsisz (-x stored in the spring is:

  97.10: A compressed spri:m rfc om:ctpgh8( ki- a35+oong has 16 J of potential energy. What is the maximum speed it can impart to af:+mproo hatgk(-8 5 mc:c3io 2.0-kg object ?

  

  10.31: An object of mass M starts from rlb,rk lrx(/cw *f4 etv/- 1sxjest 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 person on the block compare for the two trialjkf*l r x,/vr b/1wlsc -4e(txs? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.