97.01: A force F directed at an angle of θ above the horizontal is u (ygt/ax -gn-jsed to pull a crate a distance D across a level floor. The work d(xngt /j- gy-aone by the force F is

  97.33: A softball player catches a ball of mass m, which is moving to9+dw)4mw7s+me*u pejb 4yv poward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizon) +p7*b vwmj +uwydpes9 4eo4mtal force exerted on the ball by her hand is

  99.14: A construction laborer h cb7shsm ds9r ;1scc66olds a 20 kilogram sheet of wallboard 3 meter abocb6h r c;1s7d smc6s9sve the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratiokai d yu *lj6a6i0/hi+og89gl n on a horizontal surface for 5.00 s. The block’s kineti oi8ijhua /g9k0ld6l6ay gi+*c 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 5 sdozsselq ul7(plji7 te)j /i2(k.+ uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 7t)qzj 7skp /il(id2ej5+ leo. su(ls50.0 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 r uw31+u;fkgo zight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and1u wo3gkz+f u; 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 3.0 kg block fd )r:a8fyba c)or 5.0 s. The block was initially b yadf)):cra8at 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 *tah 3qkr c.7fe7/rqvreston 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 ktv c7a.7*q/r3qrhfe the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the f+ i oxua;;p9atan ;;axu9t op ia+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 ck:-w qvxc1u3of 3.0 m, a speed of 4.0 m/s, and an acx31wc-v:uk cq celeration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textb4 ip6 im;u5ctbooks is on 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 does he do on the box. The boxpm56itbuic; 4 has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wattsnwmft/j51y5 c (about 32 horsepower) of power to a car's driving wheels. If the car maintains a c5yftn/5 jwmc1onstant 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 speedkeg1 ,fuk;3nh3c u8 ff 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of tf33k1e;ch fnufk, ug8 he 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 cp)llss/2h50 s, bx+2 j k1oyv9k mduum/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 reaches the top of thepxl kus 5ujc vs2oyl+k d9h2 /)1b,m0s incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each startc9oiy)f og + e)nv0v4ting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B9f04 oo)tyvgcev+ n) i 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 time interval of th 1hnsbn3 (ev cqzga d-0f62f;he acceleratiof ghs 0e3n(2hc;6znvbf-1a qdn?

  12.08: Through what distance does the object move during the time intra oo-o216 jm 66xy7tr82 mar4urk-xzyy.fmferval of th4o yxr6o8zm. fu2 moj61rakf-x7tyr y2m a6r-e acceleration

  12.19: The magnitude of the linear momentum of a 4b *dmycvm ;s::l /uup2fa k66q.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 m*:6ymkasl cum b2:6;u/qf pdvass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its t)taxjg) e/qg4z4z)r j(ood5speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best rd))jt4 )ra gox oz4qg t(/jez5epresents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used x 31-osmhd 6ocium57h to pull a heavy suitcase of weight mga distance d along a lev mc-7u5so1do3hh m6i xel 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 delivh9w6ql sb 06y3fbwc pi41k. vbers a useful power output of 0.10 w to ra swvbkb.4 031bpq yi6cf9hlw 6ise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg obje6y8mlgwjsz 09yr-sc+ ct is released from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth r y6s9+w0ymgs- lz8cjdoes 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 abo 8mnm4cnk 7g/tve a hard floor and released. Assuming that the collisio8g/m4 k mn7ctnn 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 movh e8foqnd-uii v) :;e,ing at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net forcee,-:o)fivq e in8h;ud necessary to stop?

  00.26: A 500-gram ball moving at 15k4(uh q9indyv6ca11 o.p: eyn m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while i y q16he(n1vk :o9y aipn4duc.t was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kkvk7czh glw ,19w7i -ej-sc* yqt); frinetic energies and the t*h-y k 1gir jqtclw z7cwfk-7;v e9s,)hree 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 inr3cem(:oun;dzdt 7m) the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potm e ()dro 7;nuct3md:zential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a feuv2 y:etyk)5 lat, 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 highest point of the motion. How much physical work did the average normal force of contact2 y5k:teuey) v (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 grozja4v yag:3:xf/rbs/ und. 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 v4rax/bsa/ yz j 3::gfforce exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheightq(ah.0)/xtlpn r81g gd zqss f;ipx (5 H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upwa( 1;g5gptx/ )hp n(zr8 0 qd.ixslqsfard 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 the cor ls)prg( pq0egu)13wai :h(jvd makes an angl(eg:) v g(l3uparh1 j 0iwqp)se
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 angztdm1 1v3s-3ze et3cr le. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m zm1es3t-r3et d 3vz1 cabove 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 carti4vc3u;xq +z pons 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 mass of 25 kg, what is the total work done by the deliveryman on the cartons to move them to the loading do zc+4v p;qiu3xck?

  12.16: A constant force F=50N (as shown in the figure) is applied for the 64d75ew ku8-vx xif.na.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Whicev54- ix.8dxw7u afk nh 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 abs2n*cv 0y2 ksre each dropped from rest from the top of a tall tower. Ball A is dropped ons0 k b2sycnv2*e 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 *2mol7yxo7a.atn h * mmass 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 terms of H, to what maximum henat7**mmah2 .o lxo7yight 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 oovnt1/in cv67f 20 N/m. The potential energy stored in the spri6v t/o1nncvi7 ng is:

  97.10: A compressed spring has 16 J of potentih5gb9n gqz:6bal energy. What is the maximum speed it5zhbg b qn69g: can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a 5rnr4v83(g) hnhbeysrrq-0lrdeoh g13i+l6 fixed incline of height H. A person decides to push the object up the incline in one of two ways with an applied force showo450g+ (rhinqlg33eyn6) rhb8hrr1 vrls de- n 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.