97.01: A force F directed wh e,.1m nf;lbat an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. Thne; f1lhm.,wbe work done by the force F is

  97.33: A softball player catches a ball of mass m, whic/6qgexjmi y*6r g,3 tth is moving toward her with horizo , i6 gye/q3gtxt6rmj*ntal speed v. While bringing 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 2ovs7jk 5qq(0pr*m rft y,+7 du0 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was (5m 7yrk* qo,+ 70pvfdtsqujrexpended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration6uuljh 8*vu+, id*gew on a horizontal surface for 5.00 s. The block’s kinetic energyh,8w *iju6gue+ *l vud 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 horizontal s; j4ynf:jc vj*g3 *qedurface for 5.00 s. The block’s kinetidny3:c*g v;fj j4 q*ejc 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 on a 3.0 kg block wuod(.k2 z1 y/ oochqvjz a;5c7e)mt1for 5.0 s. The block was .jo z)uo et2 w(hq1v dc5ay;1/ozckm7initially 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 azxz80t;uiwbkha . jw 42gz9eqv;ld3g+ ,ni* force directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slixza4;;gjw 83,0kb wq+9a2u* ezhi.dvz itg nldes 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 fy urhhnz3/0s )j8,wr lrictionless frozen pond throws a 1 kg hammer in one direction. After the thr h,/3zrsj h8 )ywnu0lrow, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows thw de 6 g44mkqxi/:*tjxe air and gives it kinetic energy. An hour after the fan has been turneg * x/md wieq46:4txjkd 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 p;tx7e o8rgtyqgc7svm 6iv5 glpu:4 8;osition of 3.0 m, a speed of 4.0 m/s, and an t8guqv76ovsym4p;;ei8r 5glgxtc7 :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 bdx s)1 cw8uakm6llyx lkr 8nk2(t+w; .ulx8e:ookroom 1.3 m from the floor. If the janitor rex)ea lrm y8s+:8 lw2.kluxdlx w8nu16ckk( ;tlocates 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 wattsols) )p7y 2msl (about 32 horsepower) of power to a car's driving wheespslmol ))y72 ls. 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 witkl7x.8;ovzvpn jilj, yz nv9r8*3 t -kh speed 5.00 m/s at the bottom of a rough93ny. jxjoz8;k-lvz 8v 7 vrp*,tnilk, 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 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 +a(ni mnpc p15right, a box moves 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 speed of 2.50 m/swhen it reaches thecn5pnp+ i 1ma( 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 * ar inha4 /t ;kq,xhmzof-3amgq/;5 astarting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a ra/q m;i- z3m aqfgn 4ohah;/a5*t,kxdistance 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 thmgg0 xxur:67he time interval of thgg0x6:rhm xu 7e acceleration?

  12.08: Through what distance does the ob ,,sjp4 ps5d;jxbcga0ject move during the time interval of the accelerationspc;ajs d xj,g0,45 pb

  12.19: The magnitude of the linear momentum of a 4.00 kg point massv (o+nvj82m 51 mdon2xp gk)kwiw (sh+ is changed from 6.00kg.m/s to 14.0kg.m/s in a tim(oj2)(s nxm 2h1v+vwm5k 8kgpwdio+ n e interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its yyy)zq8 vwx t5jeohf)m(w6)8speed is increased from 2.00mz v6) h)jyqfmw t)x(eyo8y5w8/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal iikto5h b z2) r.yau*3+fqyc(ys used to pull a heavy suitcase of weight mga distance d along a level floor at constant vea *b+ k3(2qzf.iy5ryyt chuo)locity. 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 del ixxy8eul;cg 5)-n9ckivers a useful power output of 0.10 w to raise a block vertically a9n)iy ;cc xxlk-5 8uegt 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 surferl98lb0hca jj3)h+ b hzb.o7ace 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 fahh ob +).hb3j7l0bzcal9 je8rlls 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 hu3-e0z7;r ph purvtmb4(v4wand released. Assuming t(;r-e zvubru4t4h hmw70pvp3hat 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 surface?

  07.06: A 500-kg car is moving at 28 m/s. fy66kca sjcs6+ re o6 -jkkd.p*ot6e6The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net +a-dc.ks6rfy eet sjk 6oc66j6p6 *ko force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. w zqfss9):.0 vq el;stIf the ball travels 15 meters, what was the average ; l0svw)fq:tqs.ez s9net force applied while it was coming to a stop?

  02.26: Consider two labzr);7 kxk, ypx)ly:bn oratory carts of different masses but identical kinetic energies and the three following statemenpr)l xn;xyzk: )by,k7ts. 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 i* hvsmen+gv)*h) i9dair with an initial speed of 4.60 m/s)gdse*vn+hv hi*9i m). Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwar8swd5 sg.+4f0 xfvhoq d from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center d 8sgovs4. +05qfhfwxof mass rises a distance d to the highest point of the motion. 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 dropped from aheightH abogztgn;z)*wr- w 1s hrh;mp:y+ve the ground. 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 ;:hzt h*r;r-+p nsz w1wy gm)gthe 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 the gu ).9n3 r hhccjjgy h96jyg9xw4on (x4round. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to hng9jn.rg wu hxjxcy6o 9()9cj4 yh34a 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 co* ha-1jhuk 5cord length L is pulled sideways until the cord makeh 5aucjoh1 *k-s 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. The ni*55 a,f8osxz tyxak7e:33wd2q mdhc-pg r*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 anxmt pwig78qax*ds h z,* kf d-5a2nyoe:353rcd 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 sem8o9 n8wzbz)squ 8(10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a maseznm 8 sb8)sq8(9wu zos 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=50N (as s8z. o+owed j;whown in the figure) is applied for the 6.0 meter motion of the box upward along the inclinez. w+ojoe d;8w. 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 and B are each dropped fromtjr +t8x,to 5c4 a5udn rest from 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 arejttur 5,+atd48 xo5 cn the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upwardy35l9wd vcxvuk- /;jfk 0kr9j with an initial non-zero speed v. The object rises to a maximum height H/ -;xl9j30f wkk5cv ruv 9yjdk 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 air resistance.

  96.20: A force of 10 N stretches a 9wx4/x xr2 ;ap,k2,i6wm3cqno mnnwd spring that has a spring constant of 20 N/m. The potential energy st wk;9m p 4nw,oqrxm,c/na2 62wndx3x iored in the spring is:

  97.10: A compressed spring has 16 J of potential energy5gw,kju w z69s;q,hv;vdz6 iq. What is the maximum speed it can impart to a9 ,jvv6wwhud;q;6k zsigq,5z 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of m6m*df6q xtc 5height H. A person decides to push the object up the incline in onq66cx*5d mmt fe 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.