97.01: A force F directed at an angle of θ above the horizontal is used tol*p*sclqmi. ;xn-6zc (p5nzpz *r(t p pull a crate a distance D across a level floor.zzmpcnq.z* ( ip(n5t-llcx6s;p p* r* The work done by the force F is

  97.33: A softball player catches a ball of mass m, tc gwht3;uy py9tu; 49f: m(vxwhich is moving toward her with horizontal speed v. While bringingtt9v;ux(f ;y tph m 4c3ygu:w9 the 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 laborer holds a 20 kilogram sheet of wallboard 3 meteyp2kgq ;; -4p2lfoo yyr(x1vx r above the floor for 4 secoo (2oy2v g;q; pp4xrl y-1kfyxnds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on actir- 4v +p- wtmrm3g: horizontal sum+ti3 cr -wp-4tgmrv:rface for 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 uniformo1 tx0+zbu.2lg1 w gdih*: a 7h2zgvfuguf,1w acceleration on a horizontal surface forx+w*0tgvi.2uaudogw 2gffl 1gb 1:7 zh,z hu1 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 forcesdp2pd:1uxqvp :v6 r6xj; v r5 directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides 1v26 :dvpru r ;xpx6qv sdj5p: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 rigid-* wv3zsxp8 ht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and sli zpw-8sxi* 3dvdes 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 frictionle. )xglax ibw01ss 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 descrwxab1x .0l)giibes the above situation?

  03.14: A fan blows the air and gives it kghc l6h;(tm ;f ,mvm-uinetic energy. An hour after the fan has been turned ofvhh6 tmm ; ;flu(,c-mgf,
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, a speed ogebj s (lv05.hf 4.0 bj(5 slhv0eg .m/s, 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 the bookroom 1.3 m fdko 9uomrja rox.4v8n 4k4ss1w, n- k2rom the floor. If the janitor relocates the box to the shelf thdu x,kn jr8v os424ms. rk-w4oo 9akn1at 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 horsepogkh 0,px5 b5y b94hlwwwer) of power to a car's dwb h,405gk9yxh5pwbl riving 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, a box moves with speed 5.00 m/s at theo)s0 q)gbwkw- kxg(j3 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=j-x03qk)bgs) go(wk w 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 movesabsm j/pn od (2:aqa:ba o1*3o 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 pushed directly to the left with a constant force of F = 240N. The box, of mass m= 20.0 kg, has a spd:2om1bao3aqnja:bo(*a s /peed 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 right5gyh msm0 1qgi j/6tz4, each starting from rest, along a straight road. CarA has twice the acceleram0gyh tj45q s6/mz gi1tion 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 time intervz s),7 3xvq0k6+jq+9gihnoit e nk hv)al of th+ ko6 +) iehgqh 0,)vnxjskzq3v7t n9ie acceleration?

  12.08: Through what dgi3 ;q86nn 1maktfz0 kistance does the object move during the time interval of the acceleratiot8qaki 6g z03n mn1;kfn

  12.19: The magnitude of the linear momentum of a 4. 8o /(fxwv8m pd:srb4t ; zulzzueet,*pq-2q000 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 2,e/rtdpp8mt:f -e*uwzqz0 xbvq8; o lu s(z4kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy .s bx8l6,i u 8sr x,kl,ndstsi7.1rzk while its speed is increased from 2.00m/s to 4.00m/s. Wr8ui..,rs,kxd l ntxs1l6b 8ssi7k ,zhich one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horihd n8 gv-(swrz9d73fdzontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between theddh7-zrgs8 9n( f3v wd floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force ubcfge ro(gl33w* vcvw:44(iand delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crigof(*wu4cr(b 3l4wegv:3cvane raise a 0.20 kg block?

  12.18: A 1.00 kg object ite4w9wcx-v mp um491*8bqjexs released from rest 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 fo-bme4 xex cvq*m4 u1p989jtw wllowing 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 aboh 0uviyss6( tle ,)*xkftl+ lq/;kl5jve 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 5lt +u/kl * , tfhs6)s;yx qveij0(kllthe 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.b)ct(vkunkx7o q4: f ) The driver sees a barrier ahead. If the car takes 95 meters to come to)4 okb)f(7n cvqu:xk t rest, 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 uni4u2 hpz wkg.3pformly until it stops. If the ball travels 15 meters, what was the average n 2zgwp3. uph4ket force applied while it was coming to a stop?

  02.26: Consider two laborat(((:bw b 7ksl7pzdey gory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would be correct? z (ge(wds7p :l7bbky(
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 t)sjo o:r4ye; possed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, whatyreoj4: o)ps ; is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary co+te iy4rl w ea-71nx(nncrete 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 contact (N) bwn4te1yx+r(l -nie 7aetween the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above gi:3u)+a katwvvfz /: w ow,:nthe ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of o)::v+ wakgfi/3a u wnz, vt:wH/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 dropped from aheight H above jsxgbozc, +vw0l6*3v4 g9g vvthe 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 withgovx6vcbs,+vwj 9l3* 0 zg4vg the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways unti0q lvuo (4p0pwl the cord makes av 4 opuq(pw0l0n 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 u/-cbezs u s)yt( t6.ql 84pdtuniform 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 azbyue.(4ttl p8t/c s 6s d-u)qnd 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, along a 10-mmnalqg j(.5 :n,x(*c euy8nemb,i 9zbeter 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 o.bj *8eu, (( c5 lzb:gmm yeixnn,nq9an the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in twj* qy: cxjr3)he 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 o w)jrjq3xy c*:ne 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 f*ad.*v xl id6* k8kg)vdjvly,rom rest from the top of a tall tower. Ball A is drop6dx, lg .yv*dikdj aklv)*8*v ped 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 straigyoi2e75 bj) hvtt.e8geb6x o:ht 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? Ignotj eebx5 :o7 b68vihe.g2ty) ore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of-lr0l aefw b)7 20 N/m. The potential energy stored in the spril0lf e)a w-b7rng is:

  97.10: A compressed spring has 16 J of potential energy. What is/nobm*5l 8d) (pw ydz(0qay 1nolso2y the maximum speed it can impart toda1/ zsn8y(o*o lyn2pybmdq(0w lo5 ) a 2.0-kg object ?

  

  10.31: An object of mass M starts fraksx )b/utix 9: /t/vkom 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 speedsa kk /:) /xt/vbxtu9i 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.