97.01: A force F directed at an angle of θ above th2 j;i/thjxn6 i.4 nnrte horizontal is used to pull a crate a distance D ii x tjj2n.htn ;6r4/nacross a level floor. The work done by the force F is

  97.33: A softball player catches) /:tmebk)6fk auip4p 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 deceleration, the horizontal force exerted on the ball by her heip /p :6amk )f)u4ktband is

  99.14: A construction laborer holds a 20 kilog3 4lmpmg *ny1.;avvibram sheet of wallboard 3 meter above the floor for 4 seconds. ;4mvbgpa1 y ilmv*.n3During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform aai ix)by* +8lin58h:pw jsp 5tcceleration on a horizontal surface for 5.00 s. The blop58+yi xl )biphawsnt5:*j8 i ck’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 slidesg -jc crf(;4jo with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to o4 cgjr- ;(jcf20.0 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. 6+6huyq*o d oui:u0ln0 kg block for 5.0 s. The block was initially at rest and slides oodqiuu6ol* 0nh u+6y:n 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 righxxj v/xydhyd u /);1 f0l5k8kmt is exerted on a 3.0 kg block for 5.mul0)f5jx1dk//xh y8 kd ;xvy0 s. The block 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 inih 2bxf7 7eedz ))qw +7w,clsfetially at reston 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 ofewfq )elbc, z7exd77s)h fw+2f 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 t7j v inhpg2l s 817*s)twva(dzhe fan7 wst(*n z8av)dgi p7sv2 j1hl has been 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 ms: ijq *dzwe; b5wqvd084irz +, a speed of q; w vdz:*i +8sbd4ie0jz5qwr4.0 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 bookroom 1.3 m fro k+h18dus+a.2mx gl3qp n 7molm the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work dhml2 mn.8o qgl 3 d1u7xps+ak+oes he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wj3r4da +e zcp-qkv1 a*olwe2kl2 c0 ve6y99dh atts (about 32 horsepower) of power to a car's c9k + y3kadejop2*l-9 ev z6elc2daqw0 v1hr4driving 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 wiljo1; r,j hl4)(u sqjpth speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant qjho(l1jlup , ;4 sjr)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 righcfa9,yuo hdl1d:7n wlxy(+ (kt, 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it rea,alo(wk(7yxy+cdfl 91 h :dnuches 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 rx6bd1hi+ep8iqih/. ight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has travelh8 6x/pei iqh d+irb1.ed the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting o* 5s(5qphbhkon the object during the time interval of the acce*sk5(hpq bh o5leration?

  12.08: Through what distance does the object move during the time interval o6; r axpo/j7g.mi7qhkf the accelera/qm;k7 .r pxoi6aghj7tion

  12.19: The magnitude of the linear*vz4-jgnx60tmlyj ymrzwi3 m-/ bn 5 * momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a tm trx 4-bn 6y mnimw5j-g/v 3zy0zl*j*ime interval of 6.00 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 it+mxfb qnv(. b i5n)ku 0/bu,wj38hqygs speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represen) +3g bmfx8j.w,buqvqnk n ihb /(05uyts the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavyfvkqg h(9vz(t,v. or4 suitcase of weight mga distance d along a level floor at constant velocity. The coefficiev4 .ktorq( f9h(g ,vzvnt of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exer7z 5 mymt1oh snfn.y.6ts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane o6 5zt.yy7f 1.n mhsmnraise a 0.20 kg block?

  12.18: A 1.00 kg object is rele26j8 al. w3pv(ptfd wn3x und2ased from rest near the surface of the Earth, the gravitational force act(dwt2axd36fpl8 n. 2 juwnv 3ping 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 a43kmf qn pc u,1/xcgp 2-lyp dh+m1q8bbove a hard floor and released. Assuming that the collision with the floor is elastic, whic-1q1fp3m hb/2gm, p kpx8ldu+cq n4ych one of the following graphs best shows the relationship 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 sees a barrier ahead. If thyow;:*7i op h. bizc;pe car takes 95 meters to come to rest, what is the magnitude*ypbwo;: .icp;i7 hoz of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows do; l3 d6hnkmqp,+x m5gk3nrp6iwn uniformly until it stops. If th,3mx h3rlpdkgqni6 p +;5n mk6e ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but 9xy;,/t2;atd8v qy4 dogfn x9b- dvzridentical kinetic energies and the thre-v;dt dnx 8fo/ 2;99y,d y4xgz rbvtaqe 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 vertiy1v eim7h q):ccally in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential enicv y71: eqm)hergy when it reaches its highest point?

  06.20: A boy jumps froam. smqj (k98qm rest straight upward from a flat, stationary concrete surf( k j8q9.amsmqace. 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 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 above the ground. The object0bi p)f/5:zua ppm b*1s5hfzv cfmp/hap s 0*fz) b1z5ibuv:p5rashes 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 coming to rest?

  12.48: An object of mass M is dropped from +z1q 3zvni+3yvrd( +c(sr ycn aheight H 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 1(rs+( qcdzvryy3+c3v i+ nzn 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 until the cori*t 3,sc 3fzhloo vbza 54n-g(d maki35t4o vznc hba- *sf,lz(o3ges 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. The sled,d2903q6r p zzp3qjpqq which started arz0p9q6z2q3p dqq jp3t 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 the hill?

  06.09: A deliveryman moves 10 cartons frglk.184rjmef to 02wd om the sidewalk, along a 10-meter 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 thefd.mo84 j kg01wtr l2em to the loading dock?

  12.16: A constant force F=50N i;a+an7 c/qw8i,p et :ot(ifm(as shown in the 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 wor:mea/,i8ipoft7(;wtac+ qni k done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droppt)k u3hc);obsxr owjy,2p-1 ted 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, howt)o,h jo)p1suyr3 wc 2k ;xbt- are the mechanical energies of the two balls changing?

  11.28: A person throws an object of uz/t+e+wy2z9i:tm5 :v fre vjmass 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 throws an object of mass 0.5M straight upward with initial speed 2v. In:9tt:5eif v/wryvjezm2uz+ + 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 s jsdtnxm:0c ,:o*j +fspring that has a spring constant of 20 N/m. Tntf :,x s* 0csjo+:jmdhe potential energy stored in the spring is:

  97.10: A compressed sp4cbce qt29f0w o(bd. qring has 16 J of potential energy. What is the maximum speed it can im9 bbq.20 dcof4e qwtc(part to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottomxklka(xx o9l15.1s j i 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 trials? Assux .(olxl195akk 1isjxme the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.