97.01: A force F directed at an angle of5kkw uhr*1ct 1a 0atd2 θ above the horizontal is used to pull a crate a distanrtk2* w5caah0kdu 11 tce D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m,y3te*y -gohtk zc9v (+ which is moving toward her with horig3o9 +vty(et ck*yz-h zontal 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 augpe v k8e9jdq:l,:(d 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 seke9 luqg e:dpvj8:d,(condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block a20bq9t sg9 5iouoo*fslides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J oq0f59gus*oi o92tab 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 tbb bbo 7k+8w)a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 2bb 8b+ tow7bk)0.0 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 ri7 rl2 gd.+zok,ysyo+k8/uf ri ght is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal suu +lk. 8,rky/ozdf s7g2ryio+rface.
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 e-wjly,sb q grpt g4p zp5)4+h7xerted on a 3.0 kg block for 5.0 s. The block was initially at rest and s- 4 yt7lrpgq 4+w,zpjpb)h gs5lides 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 fric nx n f- nw;q)chfocp539pt9.etionless frozen pond throws a 1 kg hammer i-c59tcxw n)n;3e fo p9n.phfq n 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 describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour a9mhs ij.,hh2;i5pbpa i cen 3/fter the fan has been turned o ;,j s/ah.ib3iecm9pn25 ihhpff,
what has happened to the kinetic energy of the air?

  09.05: At an instantm i4 zok6:dx(g, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratio :x4i mgo(k6dzn 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 bookroomjn 5;1azr5b tq 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the f 5nqr5zab;t 1jloor, 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 horsepower) of p w.nc,+ -w 5cxnwd1rfsower 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 ons+f.x5,d n-c wrnw1wc the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s ;x0 w2h7 kevf+ y+fjkhat 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 ofF = 240N. The box, of mass m= 20.0 kg, has a s+k02yx 7;+k jvwfehhfpeed 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 0eefd2 ae:tp1 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 pep0td1eea :2fushed 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 of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to t y*ao1gz snk -kb5ntf ,m+2z6the right, 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 is its speed in terms of B b a,1tgszz 26k mof-n5k*y+nt?

  12.07: What is the net force acting on *nt4yg6mic 3v.d z l1ym.0yx vthe object during the time interval of theylvgmymc n4301 iztd *.6vxy. acceleration?

  12.08: Through what distance does4*ymgyg4t,paxtw ,j + the object move during the time interval of the accelpj gg m*,, y4+tt4axyweration

  12.19: The magnitude of the linear momentum of a 4.00 knfwkb8 l+yk:; g point mass is changed from 6.00kg.m/s to 14.0kg.m/skfbk ;nl y+8w: 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 J of kinetic energy while its spee iy 3yy4q)nd02ic2xmbk+9 cy 3mbz8yed is increased from 2.00m/s to 4.00m/s. Which onm y3qck8 i22y9)d yn ymibye4+xc0bz3e of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pul+kr1 ot0e) om55 swpsel a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. The work done by the frictiost5+5wo p)kseomer01 nal force is:

  14.31: A toy crane exerts an upward force and del2ytcf1i; cl0 jivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise yt1fccj02 li; a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of te6u;7ib vt 9ddhe Earth, the gravitati6di7b dt vue9;onal 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 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 motionlesj yi oqweg0u :n21:na/gjr1b7s a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the followij2g:/1oa :b7i eynw0q jrnug1ng 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 ++ rm mfodts s:b3;32kxn aqm8a barrier ahead. If the car takes 95 met32m3 satnb:+fsomd8x ;m+qkr ers to come to 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 uniformly until (ar: w +d3ks+fl7nwrqit stops. If the ball travels 15 meters, what was the average net fodqfrw( nr:l aw7s++ k3rce applied while it was coming to a stop?

  02.26: Consider two laboratory xij0tk,szu,6e u cx*y/rsb)9carts of different masses but identical kinetic energies and the three followings0*b ,,ut ixx)/zrsj ck96yu e 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 inw 7d2k de,iyh3 the air with an initial speed of 4.60 m/s. Ignoring air resistancw3 hydd2i,k7 ee, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from adbss:gh 2 r7-blg(t ;i flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with sp-g2si:b hsl g (;t7rdbeed 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) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of ma7bgp 9u7vr-tl ss M is dropped from aheightH 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 c uv77r 9pltbg-onstant 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 ground. The+ kw, 2 bn-yf4drcy,ci 3tcea wu72km3 object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward t w2twenf ckiad4 ,,2yrkmc7u3- cy b+3o a 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 sideways until taq)b/mhzr*yte* /kn :he cord makes y *tr/n b/ ezkmaq)*:han 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 sled, which0*a soi-i l7dgjb3h z0 started at the bottom of the incline moving at 10.0 m/0 0doh 7zijil3asb-g*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 the bottom of the hill?

  06.09: A deliveryman moves 10 c t,1 flb8;3:w(os; cotagr;m3eabaeeartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carto;ew,(la1 bg3;sfa8 tamobeco;r:t3 e n 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 m*dqb .nx,vl.shown in the figure) is applied for the 6.0 meter motion nd*.qx bm.,vlof 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 and B are each dropped os2yflj sfv(-f )6/iifrom rest from the top of a tall tower. Ball A is dropped one secondly)isjfv6fo-( sif/2 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 straight upward with an initial nonq js)keu *t85t-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 0.5t ek8t5uq*j)s M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 201 uyn,wxc5x3c N/m. Th cn1u xc5xy,3we potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What iqp /.p7-4 blpu7uuwqqep . kw,:prm3 zs the maximum speedrw,u:ulwqk .-uqeq p4p/mpz .b7 73pp it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M star zichd*uir990 o/h 6bets from 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 obje/o6e i9ruchd9 0hb*zi ct 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.