97.01: A force F directed at an ,i . 6z;m8yhzozu b:vhangle of θ above the horizontal is used to pull a crate a distance D acroh o.,6uv:i;bzm 8yz zhss a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving t ;72s- gieigez-l .. 5kdpyrntoward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanceegdtz 7;i.i l.p2 -s5 yrk-gned. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A constructiot9dgmlfgs. b1.4lx1g n laborer holds a 20 kilogram sheet of wallboard 3 meter above the lgt 1 m.x9g.f sg14ldbfloor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg bjw3u/udb , lj.r(v p.zlock slides with uniform acceleration on a horizontal surface f rjupzb.wv d j/3lu(,.or 5.00 s. The 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 q9fn/ss yp-*runiform acceleration on a horizontal surfacey/ fnsq*rs9 -p for 5.00 s. The block’s kinetic energy 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 directed to the right is exerted on53vzcpjkkv (6v663mf le*xbh o4su8u up- + cg a 3.0 kg block for 5.0 s.3kvcgvzj8e 5 c 666phup+b-o4kf*s3uv(lmxu The block was initially at rest 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 directifdv p8*3qu zvb3,n5w ed to the right is exerted on a 3.0 kg block for qfz*pd5v 3i b3u8nwv,5.0 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 initially at reston a frictionless froze ,l1jfs,clij4h cuc6 6n 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 otheujc, ,6c46 fshcillj1 r direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour a2x3 cav6qmle.0jit (nfter the fan has been turnanv 0c.2em36iq(lxj t ed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, vbjcs t2j s:2*a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/2tjbcvs*2 :sjs, 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 thmta.u b6k q)-h at51ryni9jz1e bookroom 1.3 m from the floor. If the janityrt5maia6kn.zq b)jh1 19 ut -or 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 wat2l xgt2bjb0 )vts (about 32 horsepower) 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 mag 2j2t0bbglvx )nitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves+q6j,ox( y-e 0 rkwoc p).+fuqrr,nnw 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 puw-n,)peq+w rfc0onkr6,rojx+q (y u .shed 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, q twqab*3 5ndu;kv** p-) uykea box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. aub yn* * ;pk)ktq*d-euqv5 w3The 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 e x.pp e62mqjy)-v8-nu- lwvk rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car qknee 8mx)juw lv -p6-y2 -v.pA 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 time introp xc x;iq-7/erval of the acc orxx; i-p7c/qeleration?

  12.08: Through what distance does the object move du.luahkd /7w8 oring the time interval of the kow.78h au /dlacceleration

  12.19: The magnitude of the linear momentum of a 4.00cb 1ib5txb :,t8,rcg o 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 this time interval?b c, 5tgobx:,bc8rt1i

  14.11: A crate gains 3hiyd- vt65fh e(+8u cyc-hsmblo 7 b436.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which onelcts o-him 38h-b46y(vubc7he 5yfd+ of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pwh9 8lee5 z ((erakm-qull a heavy suitcase of weight mga distance d along a level floor at constant velocitywmr khe(eqz5( 9- ael8. 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 sjs n 3)z2zd;eg( yvs,ev9fy2 delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant s 2z)n(9;vy2 dj g,z3sfsvye espeed 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 E-l)ui f sx5r-pkb* h9darth, 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 worbp)*- u-5lxfhikdsr 9 k 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 above a hardi6dsatu-iv2 k4qc 5 w2 floor and released. Assuming that the collisio i2 kc6uv25da-sq4itw n 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 moving at 28 m/s. The drnqy0ze l ) 3t.93qcqciiver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the mint y9czn)l. iq33qceq 0imum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows downkiv1wqt0589iu z y nm m*p2py9 uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it waywyvmz1 9mqpt5 *kn 28pi0 ui9s coming to a stop?

  02.26: Consider two laboratory carts of differen y1t arhqf8r/dso/s8a(n:b )z t masses but identical kinetic energies and the three following statements. Which of the above statemef1/sas8ryt(br)8 dnz /o:q hants 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 z -r;ovx7f(j-kg z )osis tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when iso; xgr( kzfo 7v--z)jt reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, st,+6n+byvp ujyvlry 9: ationary 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 y9b:y plv, yvn+r+u j6contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mas p vp)lso + o*(4iiwnz 8qvwpx0vl80l-s M is dropped from aheightH above the ground. The object crashe8wv* 08xo(4 - pslwvlozlivnp)pi q0+s 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 droppeesv* al2uks pd)cs n0 (9) k.sg9onu.vd from aheight H above the ground. The object bounces off of a horizontal surface in a collision p)v2 (gs*90cs9dls. u.e)uovks akn nlasting 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 rz a0vn;cux-6oi w 9g/is pulled sideways until the cord ma zo9-rv/xw;0iag6 ncu kes 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 )ew 9ilycc7; dup a uniform incline of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a heighi ec c9;wyd)l7t 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 from the sidewalk, k c2eud i)3es,,h/t xgektq,+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 cartogk2uh3etk)sdq i+tcxe,, /,ens to move them to the loading dock?

  12.16: A constant force F=50N (as shoqy yn 4avdo)du- 2x-fnv1gn q2 z,t*f)wn 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 work done by the for-axn )y,fv )o14fnqq *n 2ddg-zyv2utce F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from)p boml-k ha4. gqv:6gn )-civ 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 mechanical energies of the two balls cl) av-6g-k.om4pb cigvhq: )nhanging?

  11.28: A person throws an object of mass M straight upward bjovl-c;i cg8gw :lc8/q.,o fwith an initial non-zero speed v. The object rises to a maximum height H above the la fi8.q8, olw:ccgjclb-/ov ; gunch 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 N stretches a spring that has a spring constant of 20 Nh38,up nx f*vt/m. The potential e xvu3h8p,nft *nergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is thmdvu9f:r8d*3q(y - ,)eg p *fri hy aez5zely8e maximum speed e air3zeeqy5,8frlz fd*y g)*8 -uydvp:m9 (h it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M sm burboqa2fzrw7 w .m00,r8 -au,m k-gfyx,-rtarts from 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 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 2fbz0q-8xgmmwao-a y .r uf m0bkrw-7, r,u,rkinetic friction between the incline and the object for both trials.