97.01: A force F directed at an angle of θ above the horizontal iskcm5lc86q3: u3sli a,dxa) rc used to pull a crate a distanulcrkc56s)c8dl: q xma,3a3 ice D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which izi564xdkk u-hs moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assum5ik6x kdu4h-z ing constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilo3;ol58zuc f 70e2atmdr sc;c wgram sheet of wallboard 3 meter above the c08wze2 df7c;al 5 crtm;os u3floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wim c )b;.l(ggreth 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 timecgb (. )grm;el.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform accelera+uio3+ . kwc8ig im49uqbb7dxtion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thisqb u.ud9x83gm+ cbo47i+kiw i 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 isjme, b.h10tvd.v7t ua exerted on a 3.0 kg block for 5.0 s. The block was initially at re vet.,07 dbj1tvah.m ust 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 exertedeom:m+ h*x.m.mm7 zgx on a 3.0 kg block for 5.0 s. The block was initiallymexo*m+m:g.m m zxh .7 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 initial;01dfqd7 cm c1htmrj4 ly 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 off in the other direction. Which of the following correctly describes the abovchq0 ct1dm;d4m r17fje situation?

  03.14: A fan blows the air and gives itpn:w kdre-*zeu1)9iwib.nl 7 kinetic energy. An hour after the fan has been turned off1ipue7dwe*9zl-. kib:wrn) n ,
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 3trhyk z q:it. bdjd:z74042 xu.0 m, a speed of 4.0 m/s, and an accelerationx2tj0ik7z y4z:.h dtdu4 : bqr 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 q7lmc )1hxm /m)mu7glm from the floor. Igm) c77ux1q/ l)hmmmlf 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 mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) ofwye8:era yy) 7g;2ckde7: df x 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 )78e;: eyy kfwdr :dgca2ex7yof the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s dd se 1n.s2)oxat 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top os2).n dxd1s oef 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 bif8zqcjna6p 7t-2:b e5jb:a with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides w za 5 bicq:ejj8bfp ba7t-:26nith 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 rest, along ydpe,j,8 h(ljfwn8t9a straight road. CarA has twice the accelejy9fthlp ,w(d8ne8,jration 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 forczea: 1 ;eh)nzme acting on the object during the time interval of the accelerate1 )haz:nmze;ion?

  12.08: Through what distance does the object move duri +fqemt0x)u0 vnj,pu +ng the time interval of th,+u0mqvx jp feu0n)t +e acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point maso l3+hgtbb) s5vou1bjf zs 8s *0z5et3s 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 this ti fu8otslsjz5o 3 v3*5+ bz)10 sehbbtgme interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is iq *m,at lp d lx(hbsx.((8 h8v587q6yslok fokncreased from 2.00m/s to 4.00m/s. Which one of *l6 kh7 5d lhxs m8o8y8kx(oqb(q .fasplv(t,the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the hor mo*0g6o;i tefizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction betweemt6fi0e *; ogon 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 deliver y, mn6l7xzxu9(ssgttgx*/.j ckh+ 0rs a useful power output of 0.10 w to raise a block vertically gcxy0jl g+*(zh n s,/stuk69xt7.rxmat 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 the Earth,jwyfl.8 er lefdi*: *- the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the objectjr.-*f lwie :f*8ydel 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 av8z2h-iwe ,kz 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 between the total energy E of the ball and its height h above the shwik,8vzz -e 2urface?

  07.06: A 500-kg car is wn :yiz jpe;18moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, zpie n:w18y;j 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 uniformly uemxc06p n(6 sontil it stops. If the ball travels 15 meters, what was the average net force applied while it wa 0m6pceno6 (xss coming to a stop?

  02.26: Consider two laboratoryg nj i6f2s.o8k qy5ia8 carts of different masses but identical kinetic energies and the three following statements. Which of thei 5 i8asn6g.jyfok2q8 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 with an initial spew5 6 0r *wveau6od,ddeed of 4.60 m/s. Ignoring air resistance, what is the change in its potentva60owwded *e,dr5 6uial energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, staij:xp9ok ,cx4tionary 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 highest point of the motp xijk,x o:9c4ion. 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 p8wes *wqdk8 ,sn*ns 0dropped 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. Asskwqpdes n s,w*0n88*s uming 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 m2th 383c(jvfdfq)dmvmt18 z azqjw9 4ass M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collictz )th(d f azmjmv2 3v89 q4wjq31d8fsion 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 during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until thjp. v +y:tryg;e cord mgpvy.; + :rtjyakes 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 uniforndjl,cr z0h m*h5y0/x m incline 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 slides back down the hill. What is the sled's speed when it returns to its original position at the bottom of the r jc/,*mnd050x hhz lyhill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along w (f n9t8k8/5ojcq)a0x cy cmha 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a /(9k ocnjq0y f85xc ) t8hcwammass 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=5qac) dvh+ r*b kad:1bd4d6e 8g0N (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 ofdd:cd4*kq+)v aah6bb 18 rged the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls; d3n vckz(0qk A and B are each dropped from rest from the top of kv(ndc z; 30qka 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 mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M strmi9 an+n kbqe.zbn.3 fen6va b i:g772aight 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 does the object of mass 0.5M rise above the launch pointaniiag9 +e.q fbeb762k n bnnvzm7 3.:? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a s,fuv ge7 )mh*be+ xe4gpring constant of 20 N/m. The potential energy stor,4u emv gx)b+f geh*e7ed in the spring is:

  97.10: A compressed spring has 16 J of potential en64y*gsem9 /g drktbc u4ib :3gergy. What is the maximum speed it can impart to a 2.0-kg objbs4ge dg6yuk: bgc/ r3imt9*4ect ?

  

  10.31: An object of mass M starts from rest at the bottom of a ahka+t.*ldc; 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 d tal;*h.cka+ 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.