97.01: A force F directed at an angle of s3 jxgj9fs+4 c8vp.5v eff f1cθ above the horizontal is used to pull a crate a dif5pjjv +9s s 8vfgx.4ecf f13cstance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of m (0guhjalvp :zj8/i*gass m, which is moving toward her with horizontal speed v. While bringing theu*l0 p:v /g(8igjhazj ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction labota0r7dcq kwzt;z+mu1*; 5f bkrer holds a 20 kilogram sheet of wallboard 3 meter above the flooqcuztzmwfr tdk+a*5; k; 17b0r for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sl0 va8/;wpy5 ogqx0eaf)rers 5c9 phf*jnj3: r ides with uniform acceleration on a horizontal surface for 5.00 s. Tho8p); 5x /hsacf 05:0fr*r3vrq pea ne yjg9wje block’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 slides with vba5 akfn :06n uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this tia:ak0nf v bn65me.
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 rig)qvvmi/zmsa24pl 0 g -ht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal su pmgqvis0) mv4 2al/z-rface.
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/ v*2nm1 zgllj-md0 tf.0 kg block for 5.0 s. Thlzln gt v1f /mj20*m-de 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 initially at restoa;jhm( j-vf +cn 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 corr+;-mfjh v(ajcectly describes the above situation?

  03.14: A fan blows the air and gives it kinetic h,wi)nl, 7jeu t3anx5energy. An hour after the fan has ,e7l3tu,n5w ian jhx)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 m, cbi)78ucw pu 6a speed of 4.0 m/s, and an acceleration of6wbup c)u87ic $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the book5x zt6avdxv8r 9p3 )wjroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much3r p8vj wx59zxa6)tdv work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivzkkqatgqw8,, 0- 2g lsers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car m08, g2q -glwztas,kqk aintains 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 with f 9 flgs6x:i) h0(bowaspeed 5.00 m/s at the bottom o90whgxbfas :)oli ( 6ff 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.
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 n+a 0l/xy q (mih)akq/5.00 m/s at the bottom of a rough, fixed inclined plane.il +/ a)hnq/qxa0(ykm 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 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/ p7/bahhn7 h4ud.u lz rest, along a straight road. CarA has twic4z.lh7 /np 7 aduhhu/be 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 force acting on the object during the tih8wgwurru:o qiz 7 nrcqt46h+(mv61*me interval of the accelz6uwh qhg6 +nrtr8*oc ui7 w1v:4qm(reration?

  12.08: Through what distance does the object move duri cg9hbab7muj 3cp93/r7jd 0vfng the time interval of the accelerati9 bc h0vcpf/7jgbuamr3379 j don

  12.19: The magnitude of the linev w/p4 3k f/q2qi6x9o *obprvear 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 is the change in the kinetic energy of the mass during tr* po /k9 2v43oxeqw/ib fqvp6his time interval?

  14.11: A crate gains 36.0 J of kinztzro5,u2n,*r7-z ii du;f fc etic energy while its speed is increased from 2.00m/u5 f;ct,iu,*zfo 7ni-r zrd2zs to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above t k5akf9u5k8 r1aags3 bhe 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 suitcase is μ. 3k1fu5k rbag5s8k 9aa The work done by the frictional force is:

  14.31: A toy crane ex5p lw1c(pq3y(d.0nk gl l- s dm2v*ebaerts 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 cklqvm(wl sa(y0 -p3*d5belg12 dp.nthis crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from r k e.t4/jxor-)lv: vgh7khw s+est near the surface of the 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 gravitationvhjs. -74/ klrwkoe:gh+vx)tal 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 floor andpu odzfmz3ga2 j3.1 :z released. As31 a u3 fzzzpm:jgod.2suming 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 surface?

  07.06: A 500-kg car is movi mv vwsuni*,74e4w;atu(o6 wxng at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, 4wv 7stni(4owmu wv e;*6uax,what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uni2 utpgibjgnkeefuqtdv, d c ;p 2l9.8;-*8p /eformly until it stops. If the ball travels 15 meters,p ig 2u/jne*bl8u.;kdv29 ct tee-; ppgqf8 d, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts ofbflof( u(*,6 jp -fdzs different masses but identical kinetic energies and the three foll6-jl s*bffzp,(o uf (dowing 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 (k;i97dmty1 s iui4 zvof clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is thetvmysd(z4i k9 7ui1;i change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight 1:,t9jm0dagpkqx ; u mupward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of pxm1,j da 0tm;ug:k 9qmass 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 mz4)e66tbp2l n (mbkz)oyg9ztass 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 resistan zpzt b)m9tb4(k2zgle)y6 o6n ce 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 aheight H above the ground. The qn5,lh 7mx z5wobject 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 ma5mwzn5 h,lq7xgnitude 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 uwbe8z 5m3*iq is pulled sideways until the cord makewim q*8z3e5 ubs 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 +jkrsbl x9) udhxz-3v9-nv b5of 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 itu xx9s bv-v93n zjl-db5 k+rh)s 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 from the sidewalk, alg(k5s tlez. trl++u+kong a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a ma+rlg+ tlk.t zesu(+k5 ss 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 force5 0x9isf2fcgbkb0e. ij(f-/w 3yp qus F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the inclineqjfi.f 2c0u -i(y9/s5gp30 esxwfbbk. 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 balls A and B are each dropped from rest froo.t,(ft0tncc5d) 6gm hk6 tymm the top of a tallt0otk(hc 6m. m5c6dfgtn )t y, 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 mechanical energies of the two balls changing?

  11.28: A person throws an obje. 1iy q*/ r+ozllr5bfkct of mass M straight upward with an initial non-zero speed v. 5 o+k.1iz* rbqrylf /lThe 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 of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 kglxp*48mx1c 4;blaad7 u5nw N stretches a spring that has a spring constant of 20 N/m. The potential energy stored in the sprd5axb 4l 4n8kwa7 p;x gmlcu1*ing is:

  97.10: A compressed spring has 16 J of potential enepx;(11f kdvpb c5rpr +rgy. What is the maximum speed it can impart ;r+px 5 p(crpk11 bvfdto a 2.0-kg object ?

  

  10.31: An object of mass M starts f5,3xphasx8fz q8j5 / *p ozuk.,jnzxzrom 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 rz5jux58 pz np*a ,xq .k,xzfz3 /oh8sjeaches 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.