97.01: A force F directed at ot3 c/mgf(f x c;9db;oan angle of θ above the horizontal is used to pull a crate a distance D across a level floo/ox bf93g dco;;cmt f(r. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is c,m tx/ v9jysn5 i5p:bmoving toward her with horizontal sp 5c 9/bs:5p, jnyxmvtieed 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 2 /nvx:gi ztq )g)5ysm90 kilogram sheet of wallboard 3 meter above the floor zv) y 5nqt9s:i)/xmg gfor 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerationjt64++ b(unviwfh :bd on a horizontal surface for 5.00 s. The block’s kinetic energy sihvw u6bd n+:(tfj+b4 trictly 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 z5dzoa, p .+2k7kaibp with uniform acceleration on a horizontal surface for 5.00 s. The block’s kineticz2.a, d7kp+kbp i5o az 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 directedebh v+/bzm(bxql4p: uv 4u iexm;/(,m to the right is exerted on a 3.0 kg block for 5.0 s. The block was initialleq/ +zvhiu:v(b4 (m4x ,ump bxel;m/b y 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 directed to thf yj0m)p0nn buz q((6ke right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal sqb((n 0pnufzyk6) 0jmurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen pond throws a 1 kg f)8y*w0 qxn;kn qy p,khammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other directqp q)*x;wyf8n,k0k ynion. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the faa di0y75, qjy-r1a9mfjj,aaen has been turnejr5,0em yfay9j iqa7, - adja1d off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0rlpphh;a o h:gyyqh0 d;bu ow;67).,ir77cnx .50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an ad ) ;hqu7oxoh.hap,;:iwynp;ry cb60h7rg7 lcceleration 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 fro/m4 :0cj+hnxgok7b.ynb4 g3 oy7kjs om the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does oon gsh7k/cj.3 xngmyb4: 0by 7koj4 +he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile eng8 objj-1 vemh(ine delivers 24,000 watts (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 magnitude of the retarding force acting on the cbvo1 jj(h8-e mar?

  09.13: In the figure to the right, a box moves with speed ezsfl.m l -g715.00 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 for7 fg .l-zsle1mce 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 wfn,3ts/rlv.gpc2f s ) ith 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 = 2402sfcp)3t /s nvg. lf,rN. 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 r6 7zaxdzy)lrq )99tdcy7u/s pest, 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 is its speed in terms of B?)asld/9 c6 txd7uyzq7z)y pr 9

  12.07: What is the net force acting on the objectp u1ajqe*j8x6jn6d 1d during the time interval of thj1p 6e6*1d a8n juxjdqe acceleration?

  12.08: Through what distance does +vwto,6- -w x q3xk vrkzj70gkthe object move during the time interval of the accelera6xz,k7tqrkw- k 3-x0vvg+owj tion

  12.19: The magnitude of the linear ma9qx ls2p* j9momentum of a 4.00 kg point mass is changed from 6.00kg.m/sajsx*l92 pm 9q 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?

  14.11: A crate gains 36.0 w oq);0)biaxkzn7 7-1gin pvm+cg /tmJ of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best r m)-pcn1 tvg)7i+xmzn 0/; akgwqiob7epresents the mass of the crate

  94.38: A force F at a iq7rs3tz ,f95idm m(dn angle 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 fri739ddrs q5 (z,itmm fiction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exea+-ig*b mq6n nas3h6irts an upward force and delivers a useful power output of 0.10 qnab* igs3 6 mh+na-i6w to raise 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 ,go+i:r;66w hgqcdx-od7 dmd 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 d-gh x,c drgo6q7d;: oi dmw+6the 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 phdv w;6)ed 2w-avg4aodt1.b motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elasticwo 4 pd .ghvv1wated2 -bd;a)6, 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 9+ w:o vhpjrm zp9f(/5fq-tob0k gma3 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is ttbz(pv/oo m9aw50:g k+- 9j3pf hrqfmhe magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until iqcbt/f0ugh( dz4 qeb) c( 4h:ft stops. If the ball travels 15 meters, whae ( hd4/hf4)c q0b(tf:uqcz bgt was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kine- 4)tsuafu/lqtic energies and the three following statements. Wh)-u sqt4fau l/ich 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 t/+ik tumy 1i4;4rz( aabpfd b7he air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its pobap ui iz4 /mb+ k4trdy1a;f(7tential energy when it reaches its highest point?

  06.20: A boy jumps from z+ /jw:y5,ek kmuyn:l 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 je ul:wm+zkn: ,yk/5yrises 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 ahm5vr(gjfe.a +oyv 1ozs5 9;oxeightH above 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 the magnitude of the average constant foreyx5 r1s5j9a m+o.g( vfzo;ovce exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dr4/ c -ua.vgh3/ hqhs.iiehx +mi7zo m:opped 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 magagqm :3mx+hi/-/7.i. zu cve sh4hhionitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord lengm zhnz5k:hyh819 p+zeth L is pulled sideways until the cord makeszhe5 kp8h:mz 91 y+hnz 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 i ms5/ yj1-6e8*z ieqnkzmb(uue;p,.uluz; va uniform 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 and momentarily comes to rest. The sled then sli6ekvu.m ; ei pm51(,jq ez/8lzuinb*;u -y suzdes 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, ,bcy -0gjisp6along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk.i 0jsc-p gy6b, 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 dock?

  12.16: A constant force F=50N (as shown in the figure) is applied foct ok8,:rh: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 :8fot,hkc o:r 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 p(ask ja)l y*c+bv; v7from 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 as ablcv*v+7kpy) (;jare the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward 6p :kjd/zfi-w q c)i:zwith an initial non-zero speed v. The object rises to a madfi zc kqi:/-6 wz)pj:ximum 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 air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/m. 44bj8zq +liz mw(l s3tTtl4b8zzlm(4+s3j i q whe potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potent x pa4ry-j2/c678ptdhqt g xfx;ko.z,ial energy. What is the maximum speed it can impart to a 2.0-kg objecr qgytjt c,27xfkoazxh6p4. 8;/dp x- t ?

  

  10.31: An object of mass M starts from rest at the bottom of ) sq/grjgyd+g2k 2g ;f 1h)bvka fixed incline of height H. A person deci r)y)bg2d;/g2 h+fk sk qvgg1jdes 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 kinetic friction between the incline and the object for both trials.