97.01: A force F directed at an angle of θ abov.toizi2i 3d8)g*cwpbe the horizontal is used to pull a crate .d i32g8bizw* )pcit oa distance 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 ijq .+g mu9, m ubvwp*;zt.t:zds moving toward her with horizontal speed v. While bringing the ball to r bzt:udz;j wt*q.m9p + mvu.g,est, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A constructionb u(o3l7xr hlsn+ p(k2 laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconb3k( xhl2 nop7(su l+rds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontgnk8c h9 yuu2d,o.s)* kb n+geal surface for 5.00 s. The block’se8no bhk*ud9)us+k y2g. ,gc n 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 uniform acceleration on a horizj6wn zwp:qm+o(1sas, z lcn1;ontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to ;n1s, +w6ajzzw n olc(q1:msp20.0 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 3.0 kg bl4 m/ak7sndi( wk,m .aoock for 5.0 s. The block was initikin.,7dms (aom /kw 4aally 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 direiy1k * fjna6+/dg bn3gcted to the right is exerted on a 3.0 kg block for 5.0 s. The block 3 ba+ /k6dynigf *g1njwas 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 frolub*-, ep*dyqng8 wi6zen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in o6gi,wbqul edn8p*y *-ne direction while the student moves off 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.m8 x 9 ..peitiolm84szkjzm d6,d/qk*ns*ze 9 An hour after the fan has been turnee48smdqsldk8k* m 9 ie*o9zz/mpn.zji x t6.,d off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bl:2o t+ a/dbcqrs(oa z)ock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratiod:/a2r atqsbo) ( ozc+n 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.ys .6pzqpo/-,s4tga j 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 box has a mass of 1 pa,6ts yo4gz s.qp/j-0.0 kg.

  02.32: An automobile engifq4qwc ;j ;t1lne delivers 24,000 watts (about 32 horsepower) of power to a car's qf4;ltjc1; qw driving 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, ( /bs/3ix3eop ax2rsx a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleratisx/io3 p( bx2/ex 3saron 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 5.00 m/k+u :xi5chf z7s 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, hasfch7 xz u+i:k5 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 7 ;b;a/g2 9u5j yu a6uv87dpqqwv rwqwright, each starting 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 B has traveled the same distance F, what i9 wvwua7;qygqpdb 28uq5 u;/j6av7 wrs its speed in terms of B?

  12.07: What is the net force acting on the object during the time intervu9jmuo3iz3s r(.0 k tgal of the acceleratio3(gok mtsuzi j390 .urn?

  12.08: Through what distance does the object move during the rwo3zkb + ,o-0m; v +r(ykrpoltime interval of the ac0lw +;y-3kzbrompo+ r,(v kroceleration

  12.19: The magnitude of the linear momentum of a 4.0uox7(v4 pinmo9,wu si1j9o20b jqu) n0 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 t2u s mbonw0ij7,q ujo9(oux)ivp 149nime interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed m(+1vu upygax2p wt7,is increased from 2.00m/s to 4.00m/s. Which one of the following choices besy+uam p,p2xg7wt( 1v ut represents the mass of the crate

  94.38: A force F at an angle cce. a0ayu 6e/ θ above the 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 fly.ceu /0aa6 ceoor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane i. 4h xwe7bn7rexerts an upward force and delivers a useful power output of 0.10 w to raiwnb7 7i x4he.rse 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 object is released from rest near the i fg8+:tq+x;g d gp7 mmvs8ak4surface of the Earth, the gravitational force acting on thgft+ k78vqm;ig+d8mspa x4 g:e 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 above a hard floor and rlzp3.i s0 goa5eleased. 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 heig0aoigls.p5 3z ht h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If h tlxxlrgig,bc e h;0 op;4 2b90bk*5sthe car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary, xbb2h4pcioblg5sl e;; hk0xr9gt0* to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down u4 r8cy+k,c ifgt s) eemxs20:yniformly until it stops. If the baes842 itcykx:m egc y,0+ )fsrll 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 isg4 cbj5slf5dtyt4927om6 f(o c9ofo dentical kinetic energies and the three fol2sg m9cyf 94fo6lt75do ts j5bc(ofo 4lowing 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 in the air wit9*bb*z f7+ umcvo-ua) mbwy o)h an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its b- u+)f)wz*uycao7 * bvm9 bompotential energy when it reaches its highest point?

  06.20: A boy jumps fro8fojt 0 5-whaam rest straight upward from a flat, 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 coa-w80jtf oah5ntact (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 grouom )fpq.e7 2kand. 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 force ). aefmkpq27 oexerted by the ground on the object while coming to rest?

  12.48: An object of mass M ify.n*rqe,l g;lnh ep9l501uhs dropped from 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 the magnitude of the average net force acting on the mass during the collision with the suh.e n0*,15r glenlqu ;flh 9pyrface?

  96.38: A pendulum bob mass mon a cord length L is pulle (d n j3qvq2 +r2imcl;hurm58rct)8kdd sideways until the cord makim2 8v ( q)lnc3dr rch; qt5m+jr82dukes 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.n+m6)ql1 zb beh1lal3 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 tq1m)zlehn61l+alb 3 bhe bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-metfw9s1psp4 9j7hv+zx pc7*daaer ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what i99s77f zhw4 j*as+vp1pcdapx s the total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force l5y ;op n(3xj 7oilyxt, 3mth4F=50N (as shown in the figure) is applied for the 6.0 meter motio ;3ll74 ,xjyy3oti( hxnmp 5otn 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A* 3 (0qyth3qtl0 fdm i-aku4tt and B are each dropped 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 bal3d3f0t*y htkl(a-q0i4t mq utl A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an obje u dq,dg(ikr8ei6j) 8vct of mass 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 height does the object of mass 0.5M rise above the launch point? Ignore aikvii q 6rj,8( ued)d8gr resistance.

  96.20: A force of 10 N stretches a spring k;uu d6io5pv-fa 7 3prthat has a spring constant of 20 N/m. The potential energy stor f5op;apu76d ku -3rived in the spring is:

  97.10: A compressed spring has 16 J of poten8ea8 womm wf*k0ml 9l7tial energy. What is the maximum speed imwlk f79a8o m8 wl0em*t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts tzjwz0-9 ypdpj)f;;bfrom rest at the bottom of a fixed incline of height H. A person decides to push the object up the incline )0pzy ;;z jptd-bfj9w 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 kinetic friction between the incline and the object for both trials.