97.01: A force F directed at an angle of θ above the horizontal is usve ) 7rrq1kv1oed to pull a crate a distance D across a level fl171vqr) rkoevoor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which isz0xb+i++u6ybnldm l 3 moving toward her with horizontal speed vlmly+i6+3n zu0bd b+x . 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 20 kilogram sheet of wallboard 3 meter3b rnffarw 9.z-39xdl above the floor for 4 seconds. During these 4 secondshow much power was expendedd-z39fnl 9x3rwr.a fb on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horix3n*f.rg 8 avbzontal surface for 5.00 s. The block’s kinetic energy strictly decreasxn3b8v a* gr.fes 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 horizxek2 t91gvw4 aeqzy76ontal surface for 5.00 s. T2qgvkzxeeta941w6 y7 he 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 rig 3 e0787l eao.hd+g znwb(h )e+ltwwfiht is exerted on a 3.0 kg block for 5.0 s. The block was in7i37d ow ef+ w.lgten)0+8 hzb hw(leaitially 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 the right is eu/q r82e 9frriehu;s( xerted on a 3.0 kg block for 5.0 s. The block was iehu8ef/2u 9rr; srq( 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 ini:cq0r)cow i4c tially at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves)c0 : cio4crwq 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 the a 6kv lps9 jbbf;l6jpe/:9pij9swk+x, ir and gives it kinetic energy. An hour after the fan9lv,6xppbw jps9 ks+jfje/ l;9k:b 6i has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass *nfy+4jml;qbnw-c4k z sme9 xjd)q,/0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accezb4mlncykqjxj+4n w*)/;mq -sef 9,d leration 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 from 4:2hpfnceg q )d hc;arke 9*2ge(m5rvthe 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 h 9 c:hg5;qphve *m)krf e42ce n(a2rgdas a mass of 10.0 kg.

  02.32: An automobile engine delivers 2/s rjo fr-:g.c4,000 watts (about 32 horsepower) of power to a car's d:f/so-rg jc .rriving 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 ( prg,,b,syyc at the bottom of a rough, fcby(sypg ,,r ,ixed 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 right, a box moves with speed 5.00 m/s at the bottomji 2 kha6*(zww *s(izo 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 the top 2ih *kz6sw(i( oazjw*of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travex, bc q3x:v 6w.6pwhecl to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance3. qhcxx:ce6v6 b ww,p 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 nsls-,9 kzq 0bjet force acting on the object during the time interval of the acceleration?js9, z bsl-0qk

  12.08: Through what distance does thw,3n5d q5 pvaxe object move during the time interval of the acn,53 d5 qwpxvaceleration

  12.19: The magnitude of the linear momentum ofsz249sqcja -h a 4.00 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 -9 s ch42asjzqthe 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 speed is increased 6d h vmztb0stt. 9m;(xfrom 2.00m/s to 4.00m/s. Which one of the f( mhx;vdmt btzs960.tollowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is u yfatzuvbok u5 ,c5 5;rh7oa95sed to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The co79v5,tfuhor yo55cu;aazb 5 kefficient 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 delivers a useful power output 2l,pad*r vg c5(lo+.jtm:p f so/bjc,of 0.10 w to raise a bl(,coatj,5lsfb/+lcp v2omg :* rd.j p ock 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 s) ug,unss) :mnear 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 followingusmg n:,us ))s 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 z5;vi uzjy 7ag)c);1ic,u nzcand released. Assuming that the collisio a)iy;zv c;z)cc,z5gjin u 1u7n 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 driver sees a barrier ahead. If thtuj 5t2i2y0 o3 jyqt0le car takes 95 meters to come to rest, what is the magnitude of tl0jj2oi tq2ytu 0y35the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it s m;:m2/vo2q co)bmo.3 yur tcvl ::jdrtops. If the ball travels 15 meters, what wby:l vdo2cr o)3/j ;.:r2uq:m tcmvmoas the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different massrn5kekz *shhtu9 ikn0t w/6/*es but identical kinetic energies and the three following statements. Which of the ab6/tnt0i**/uhhknk w5r sz 9keove 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 vy)vlrg 0q5bs0e:;d ok ertically in the air with an initial speed of 4.60 m/s. Igl:b5 0;oy segqkv)r0dnoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward hpnk-psq m1.0from 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 0.nk1mp qh -pshighest 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 above the ground)feoh/ h3 jx*ein/u/pj( n ad5. 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 negligu/hndex)h (je3ni/p o5f/*jaible, 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 glniwvh/cju -b 0rhgs9, ),w +M is 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/l-rbwh ,gshv g 0c9+ij),nwu 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 is pulled 92xarn i729fo dlph1q sideways until the cord makes an angle 9x nf2d9a2q7o lr pi1h
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 uniforx0g6phlpxn) zz0z 1 ,fm 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 slides back down the hill. What is the sled's speed when it returns to zg1xzzf0hlx0 p,p)n 6its original position at the bottom of the hill?

  06.09: A deliveryman vd :. (wcfzi1b;3(zfpe ).r x v3breylmoves 10 cartons from the sidewalk, 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 tz1:fpc dxe.3vblvf ieb(w(.ry ) 3z;rhe cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) vy; ic 2p atsw)x0b/m0is 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 ;wms c by0tix/20apv) the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A cd0zcjmix07 +h0 nm3e/ dcy;hand 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 ball A st;cy mi jxd+m00ch ezc 703/hndrikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight up nhm*epqlkmt z/u-meoknn 83,bnv3q 1g8) k 6+ward 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 vlukn )hnpt88noz6eq+bme 3q mk*,g 3knm1-/ above the launch point? Ignore air resistance.

  96.20: A force of 10 N sb..ck2 1rxr kmtretches a spring that has a spring constant of 20 N/m. The potential energy rbkc x.2km 1.rstored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxploe; c-qr* *bln.i +yimum speed it can impart to a 2.0-kg object ? -b**c. lerqnol; +iyp

  

  10.31: An object of mass M starts from restx +pnl9dt:.1,rng1 bi vr j.xg at the bottom of a fixed incline of height Hg j1dg.xvpn1 r:rx9+bi,.l tn. 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 kinetic friction between the incline and the object for both trials.